matrix computer analysis of curvilinear grid systems

175
Scholars' Mine Scholars' Mine Doctoral Dissertations Student Theses and Dissertations 1967 Matrix computer analysis of curvilinear grid systems Matrix computer analysis of curvilinear grid systems David Leon Fenton Follow this and additional works at: https://scholarsmine.mst.edu/doctoral_dissertations Part of the Civil Engineering Commons Department: Civil, Architectural and Environmental Engineering Department: Civil, Architectural and Environmental Engineering Recommended Citation Recommended Citation Fenton, David Leon, "Matrix computer analysis of curvilinear grid systems" (1967). Doctoral Dissertations. 1872. https://scholarsmine.mst.edu/doctoral_dissertations/1872 This thesis is brought to you by Scholars' Mine, a service of the Missouri S&T Library and Learning Resources. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected].

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Page 1: Matrix computer analysis of curvilinear grid systems

Scholars' Mine Scholars' Mine

Doctoral Dissertations Student Theses and Dissertations

1967

Matrix computer analysis of curvilinear grid systems Matrix computer analysis of curvilinear grid systems

David Leon Fenton

Follow this and additional works at: https://scholarsmine.mst.edu/doctoral_dissertations

Part of the Civil Engineering Commons

Department: Civil, Architectural and Environmental Engineering Department: Civil, Architectural and Environmental Engineering

Recommended Citation Recommended Citation Fenton, David Leon, "Matrix computer analysis of curvilinear grid systems" (1967). Doctoral Dissertations. 1872. https://scholarsmine.mst.edu/doctoral_dissertations/1872

This thesis is brought to you by Scholars' Mine, a service of the Missouri S&T Library and Learning Resources. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected].

Page 2: Matrix computer analysis of curvilinear grid systems

MATRIX COMPUTER ANALYSIS

OF CURVILINEAR GRID SYSTEMS

BY

DAVID LEON FENTON . ·

A

DISSERTATION

submitted to the faculty of

THE UNIVERSITY OF MISSOURI AT ROLLA

in partial fulfillment of the requirements for the

Degree of

DOCTOR OF PHILOSOPHY IN CIVIL ENGINEERING

Rolla, Missouri

1967

Approved by

Page 3: Matrix computer analysis of curvilinear grid systems

PLEASE NOTE: Not original copy. Indistinct type on several pages. Filmed as received.

Universitv Hicrofilms

Page 4: Matrix computer analysis of curvilinear grid systems

ABSTRACT

A general equilibrium-stiffness method of matrix

structural analysis was adapted and applied to the

ii

solution of the member end forces and moments of each of

the members in a curvilinear structural grid system. A

structural system of this nature is commonly used as the

supporting framework for a "steel-framed dome", in addition

to being a basic structural component in many aerospace

applications.

An integral part of the development of the analysis

was the development of a computer program to perform the

many complex operations required to obtain the solution.

The engineer, by supplying the appropriate structural

data and load data. to the computer program, is able to

obtain the forces and moments at the ends of each of the

members in the structural system corresponding to the

six possible degrees of freedom of each one of the joints,

or nodal points as they are referred to.

David Leon Fenton

Page 5: Matrix computer analysis of curvilinear grid systems

ACKNOWLEDGEMENT

The writer wishes to express his appreciation to

Dr. J. H. Senne, his advisor, and to Dr. J. L. Best,

iii

for their careful and thorough review of this dissertation.

The writer also wishes to express his gratitude to

Barry Gregory for his valuable assistance in the develop­

ment of the computer program.

Finally, the writer is deeply grateful to his wife,

Janice, who, in addition to typing this dissertation

while being full-time mother to his two wonderful children,

Scott and Susan, has shown so much consideration and

understanding during these years in school.

Page 6: Matrix computer analysis of curvilinear grid systems

TABLE OF CONTENTS Page

ABSTRACT. • • • • • • • • • • • • • • • • • • • • • ii ACKNOWLEDGEMENT • • • • • • • • • • • • • • • • • • iii LIST OF FIGURES • • • • • • • • • • • • • • • • • • vi LIST OF TABLES. • • • • • • • • • • • • • • • • • • vii LIST OF SYMBOLS • • • • • • • • • • • • • • • • • • viii

Chapter 1.

Chapter 2.

2.1. 2.2. 2.3. 2.4. 2.5.

Chapter 3.

3.1.

3.2. 3.3. 3.4. 3. 5· 3.6.

Chapter 4.

4.1. 4.2. 4.3. 4.4. 4.5.

Chapter 5.

INTRODUCTION. • • • • • • • • • • • • •

GENERAL FORMULATION • • • • • • • • • •

Method of Formulation • • • • • • • • • Flexibility and Stiffness Matrices ••• Assembly of System Stiffness Matrix • • Pinned-End Rigid Foundation Attachment. Intermediate Span Loads • • • • • • • •

SEGMENTAL CIRCULAR MEMBER • • • • • • •

Geometric Properties of a Segmental Circular Member • • • • • • • • • • • • Load-Displacement Equation Derivation • General Energy Expression • • • • • • • Deflection Calculations • • • • • • • • Flexibility Matrix ••••••••••• Three Dimensional Axis Rotation Transformation Matrix • • • • • • • • •

APPLICATION OF ANALYSIS • • • • • • • •

Procedure • • • • • • • • • • • • • • • Mathematical Models • • • • • • • • • • Example Computer Analysis • • • • • • • Experimental Model ••••••••••• Experimental Results ••••••••••

COMPUTER PROGRAM FOR CURVILINEAR GRID SYSTEM • • • • • • • • • • • • • •

Introduction to the Program • • • • • • Input Data. • • • • • • • • • • • • • • Output Data • • • • • • • • • • • • • • MACS Subroutine Package • • • • • • • • MACS User Instructions ••••••••• Flow Diagrams and Computer Program. • •

1

6

6 7

16 20 22

24

24

25 27 28 33

36

44

44

~~ 57 60

67

67 68 69 71 73 76

iv

Page 7: Matrix computer analysis of curvilinear grid systems

v

Chapter 6. CONCLUSIONS AND FUTURE INVESTIGATIONS • • 115

6.1. Conclusions • • • • • • • • • • • • • • • 115 6.2. Topics for Further Investigation. • • • • 116

BIBLIOGRAPHY. • • • • • • • • • • • • • • • • • • • • 120 VITA. . • • • • • • • • • . • • • • • • • • • • • • • 121 APPENDIX A. COMPUTER SOLUTIONS FOR THE MATHEMATICAL

MODEL. • • • • • • • • • • • • • • • • • 122 APPENDIX B. COMPUTER SOLUTIONS FOR THE EXPERIMENTAL

MODEL. • • • • • • • • • • • • • • • • • 157

Page 8: Matrix computer analysis of curvilinear grid systems

Figure

2.1 2.2 2.3 2.4a

2.4b 3.1 3.2 3.3 3.4 4.1

4.2

4.3 4.4 4.5 4.6

4.7 4.8

LIST OF FIGURES

Fundamental member load displacement. Member end-load coordinates. Simple curvilinear grid. Fixed-end forces and moments on the loaded member. Equivalent nodal loads. Geometry of the segmental circular member. Moments and forces on major axes. Typical member orientation. The three required rotations. Mathematical Model-l h l , all

r=6 foundation attachments fixed. Mathematical Model-l h _ l , with both

y;-b pinned and fixed foundation attachments. Basic coordinate dimensions. Geometry of l, 3, 7, 9 node points. Required geometry for ~ • Experimental model with pinned foundation attachments. Free body diagram of Member-12. Photograph of Experimental Model

Page

8 9

16 23

23 24 26 37 39 46

47 48 49 51

59 61

63a

vi

Page 9: Matrix computer analysis of curvilinear grid systems

vii

LIST OF TABLES Table Page

3.1 Partial derivatives for energy expressions. 28 4.1 Member coordinates for experimental model. 63 4.2 Summary of Test No. 1. 64 4.3 Summary of Test No. 2. 65 4.4 Summary of Test No. 3. 66 5.1 Table of Fortran symbols. 102

Page 10: Matrix computer analysis of curvilinear grid systems

P'

K'

F

px' py' pz

mx' m ' m y z

H

*

K

T

K"

s

R

e

9

e

N

A

LIST OF SYMBOLS

Member end-loads in system coordinates.

Member end-displacements in system coordinates

Appropriate member stiffness matrix in system coordinates

Flexibility matrix

Member end-forces and moments in member coordinates.

Equilibrium matrix.

Rigid body end-displacements.

Appropriate member stiffness matrix in member coordinates.

Transformation matrix.

System stiffness matrix

One half of the cord length of the member.

Radius of curvature of the member.

Perpendicular distance from radius focus to the end of the member.

viii

One half of the total angle subtended by the member.

Member end rotation

General reference angle

Normal force on any cross-section of a member.

Cross-sectional area of a member.

Page 11: Matrix computer analysis of curvilinear grid systems

M , M , M X y Z

MT' MYN

IN

IyN

I z

E

G

A

0(.

General moments at any point along a member with respect to member coordinate axes.

Moments with respect to the major axis of the cross-section.

Equivalent polar moment of inertia.

Moment of inertia about major "y" axis.

Moment of inertia about major "z" axis.

Modulus of elasticity

Shear modulus.

Direction cosine.

Rotation of major axis of a member about member x-axis.

Angle between system x-axis and the projection of the member x-axis on the system xz-plane

Vertical angle between the member x-axis and its projection on the system xa-plane.

ix

Page 12: Matrix computer analysis of curvilinear grid systems

Chapter 1

INTRODUCTION

The appearance of the dome structure in today's

modern space age society is as accepted and as appro­

priate as it was hundreds of years ago. Today's modern

materials and advancements made in construction methods

have made the dome structure one of the most economical

space-structure systems in use today.

There is an ever growing trend to enclose larger and

larger areas and in so doing man is endeavoring to control

his environment in order to eliminate the influence of

weather on his daily activities. By enclosing large areas

such as shopping centers the loss of business due to

unfavorable weather can be reduced. The same is true of

athletic stadiums, civic centers and auditoriums, green

houses, opera houses and a multitude of other applications.

The present demands, in addition to demands of the future

where domes spanning a mile or more may be desired, present

today's engineer with a tremendous challenge. The analysis

of these structural systems will require talented and

creative engineers with more than average ability, and,

in addition, there will be a continuing need for the

development of more efficient and sophisticated methods of

analysis.

1

Page 13: Matrix computer analysis of curvilinear grid systems

Modern matrix analysis of large structural systems

together with the use of the high speed computer is

becoming as common to the structural engineer's world

today as the slope-deflection and moment-distribution

methods have been in the past. The analysis of space

frames, as well as flat grids, consisting of straight

members has been well documented. 1 ' 2 ' 3 On the other

hand it is felt that there is a definite need for a clean

straight forward approach to the analysis of space­

structure systems composed of curved members.

Much of the work that has been done with curved

members deals with two dimensional structure such as arch

and multi-arch frames.5 In the area of members curved in

space the following approaches have been taken, a matrix

procedure using a trial and error approach was suggested

by, Baron,? in the paper by Eisemann, Woo, and Namyet1 ,

it is suggested that curved members or members with

variable cross-sections could be approximated by the

introduction of additional rigid joints along the length

of the member resolving the member into a series of

straight segments. This approach, however, would greatly

increase the number of equations required to solve and

would be highly inefficient for large systems. Another

approach to the solution of "curvilinear grid frames"

has been suggested4 , which involves the use of trigono­

metric series to approximate moments and deflections.

2

Page 14: Matrix computer analysis of curvilinear grid systems

In a paper on "Mettalic Dome-Structure Systems,"

by Shu-t'ien Li9 , it is suggested that any surface of

revolution supported on a horizontal thrust ring may,

if symmetrically loaded by distributed loads, be regarded

as supporting itself directly by tension or compression.

This paper then suggests that by adapting the established

theory of thin-shell spherical domes, the analysis o! the

lattice dome can be made quite simply. The compressive

stresses toward the pole and around lines o! latitude

when multiplied by the rib spacing will give the rib

stress. The shell approach, however, does not include

the bending and torsion taking place in the lattice

structure, which is necessary in order to describe more

accurately the behavior or the structure.

In a recent paper by J. Michalos10 , a general

approach to the analysis of "space networks' is described.

The method or analysis described, employs the use of both

the displacement and force methods of matrix analysis,

however, the method of formulation still uses an

iterative approach. The resisting forces and moments in

each branch of the network are first computed by the

force method, while the rotations and displacements of

the ends of a branch are prevented. Correction moments

and forces resulting !rom rotations and displacements or

the nodes are then computed !rom the displacement method

and finally the correction moments and forces are added to

the resisting moments and forces previously determined.

3

Page 15: Matrix computer analysis of curvilinear grid systems

I ~

The number of operations and steps required by this

analysis would still encourage the development of a

more straightforward and simplified approach.

In view of the preceding discussion, a need !or a

more direct method of analysis for the curvilinear space

structure still exists. The fact that a given matrix

method of formulation has been developed does not

eliminate the possibility of the existence of a more

efficient and more direct method of matrix formulation.

The majority of the structures built are not

designed with unusual assortments of member shapes and

erose-sectional patterns, for the obvious reasons of

economy. In most cases the members are either all

straight or all curved and in some cases there may be a

combination of straight and curved members. In structures

where curved members are used, they are usually of the

same type, (i.e. all segments of circles or parabolas,

etc.).

It is for these reasons that this author favors

deriving the equations for the member flexibility

coefficients directly from energy considerations, in

terms of the geometric and elastic constants of a typical

member and then substitute the appropriate geometric

and elastic constants of each individual member into

these equations to obtain the member flexibility matrices.

The member stiffness matrices are then obtained simply by

inverting the member flexibility matrices.

4

Page 16: Matrix computer analysis of curvilinear grid systems

It was with this philosophy that the following

method of analysis was developed. The method used to

formulate the analysis was a general equilibrium­

stiffness formulation in which the load-displacement

equations for the individual members are used to

generate directly the system stiffness matrix for the

entire structure, from which the nodal displacements

are obtained. These displacements are then substituted

into the member load-displacement equations to obtain

the final member-end loads.

Finally, a computer program was developed to

effectively carry out the necessary computations, and

an experimental model was build to correlate the results.

5

Page 17: Matrix computer analysis of curvilinear grid systems

Chapter 2

GENERAL FORMULATION

2.1 Method of Formulation

The equilibrium (or displacement) method has been

chosen as the most suitable approach to the formulation

of the curvilinear space grid. The load-displacement

equations are first derived for a single segmental cir­

cular element, (or in general any other element for that

matter) in terms of the most convenient element coordinate

system, which in most cases is different from the coordi­

nate system chosen to represent the entire structure.

Similar equations !or all the elements of the structure

are then combined to form a set of load-displacement

equations for the structure, the details, of which, will

be described later.

The elements of a structure may be oriented in any

6

manner relative to the structural system. It is, therefore,

necessary to express the member equations in terms of the

system coordinates before conditions of compatibility and

equilibrium can be applied. The following equations

(2-1), for example, are illustrative of the equations

which contain a complete description of the load-displace­

ment characteristics of a single element in system

coordinates.

Page 18: Matrix computer analysis of curvilinear grid systems

, , P' 1 = Kil 6• 1 + Ki2 6•

2

6• 6• (2-1)

P' = K21 + K22 2 1 2

Where P' and 6' represent end loads and displacements

respectively, K' represents the appropriate stiffness

matrix and the primes indicate that these quantities are

expressed in system coordinates.

One important advantage or this method is that

equations (2-1) can be derived !or a single element with­

out regard to how this element will be oriented in the

structure. The formulation or the problem can be separated

into two separate parts, (1) developing the equations

(2-1) for a single element using the elastic properties

and geometry o! the element, (2) applying the conditions

of compatibility and equilibrium which are concerned with

the topology of the structure. Each of these parts are

entirely independent of one another which is a tremendous

advantage in the formulation of complex structural systems.

It is assumed in the formulation which follows that the

theory of small deflections holds true.

2.2 Flexibility and Stiffness Matrices ror a Single Element

It has been found in the case of a curved member,

that it is much easier to derive the flexibility matrix

and invert it to obtain the stiffness matrix than to

derive the stiffness matrix directly as would be the case

?

Page 19: Matrix computer analysis of curvilinear grid systems

for a straight member. The inversion can be done quite

efficiently and rapidly on the computer since the maximum

size of an element flexibility matrix would be 6 X 6.

It will be necessary to consider a member as having

direction. As shown in Figure 2.1 the direction of a

member is from its l-end to its 2-end.

/ ' ,/,------ ............... L~

/ - ~ ' .-." 'J. a

End-1 End-2

Figure 2.1 Fundamental member load-displacement.

The flexibility matrix will be derived by fixing

the l-end of the member and computing the general

deformation vector "a" resulting !rom the general applied

load vector "p2". Each of these vectors will contain

six elements, the deformation vector having three trans­

lations aDd three rotations and the load vector having

three forces and three moments. The relationship between

the deformation and the load vector can be expressed in

terms of the flexibility matrix, F, as follows,

a • Fp2 (2-2)

8

Page 20: Matrix computer analysis of curvilinear grid systems

Since the l-end of the member is completely fixed against

any deformation, the deformations at the 2-end can be

expressed uniquely in terms of p2 thereby establishing the

validity for the existence of the inverse of F. p2 can

then be written in terms of "a" and F-l which equals K,

the stiffness matrix, as

-1 p 2 = F a = Ka, (2-3)

where both K and F are symmetric matrices.

If p2 can be expressed uniquely as in (2-3) it is a

simple matter to obtain p1 from equilibrium considerations.

Figure 2.2 shows a segmental circular member with forces

and moments at each end directed in a positive sense,

followed by the equilibrium equations for the member.

End Loads

Py1

Figure 2.2 Member end load coordinates

9

Page 21: Matrix computer analysis of curvilinear grid systems

10

Pxl + Px2 = 0 mxl + mx2 = 0

Pyl + Py2 = 0 myl + my2 -2Spz2 = 0 (2-4)

Pzl + Pz2 = 0 mzl + mz2 +2Spy2 = 0

The equilibrium equations can be written in matrix form

as follows,

pxl 1 0 0 0 0 0 Px2

Pyl 0 1 0 0 0 0 Py2

Pzl 0 0 1 0 0 0 Pz2 + X = 0 (2-5)

mxl 0 0 0 1 0 0 mx2

myl 0 0 -28 0 1 0 my2

mzl 0 28 0 0 0 1 mz2

or,

(2-5a)

In equation (2-5a) the matrix H is introduced and

will be referred to as the "equilibrium matrix". H is a

function which depends entirely on the geometry of the

member, therefore, if the force vector at one end of the

member is known, the force vector at the other end can be

computed from simple matrix multiplication of H or H-l

by the appropriate force vector.

Page 22: Matrix computer analysis of curvilinear grid systems

i.e.

or, H-1 • p2 = - pl

(2-5b)

The inverse of H can be obtained directly by matrix

11

inversion, or it can be obtained more easily from physical

considerations. This is accomplished by interchanging

the l-end and the 2-end, which only reverses the signs of

the coordinates. This affects the H matrix simply by

reversing the signs of the off-diagonal elements.

End Displacements

The equilibrium matrix, H, can also be used to relate

the displacements at one end of the member to the displace­

ments at the other end.

Let, 0 *1 , c;2 equal rigid body end-displacements

of a particular member. Since rigid body displacements

by definition do not affect the equilibrium of the member,

the total work resulting from the rigid body displacement

is equal to zero. This can be expressed as follows,

~·1 t ~ + p 2 ~ -0 ~2- ' (2-6)

where pt1 and pt2 are the transpose of the force matrix.

Eliminating pt 1 from equation (2-6) by using (2-5b)

results in the following,

if,

then, t p 1 =

Page 23: Matrix computer analysis of curvilinear grid systems

Substituting into (2-6) then yields,

t Ht 6* t * 0 -p 2 1 + p 2 6 2 = •

Finally,

(2-7)

If the rigid body displacements are now superimposed

on the displacements in Figure 2.1 of 6 1 = 0 and 6 2 = a

the results are,

(2-8)

6 = 6* + a 2 2

If the rigid body displacements are now eliminated from

equations (2-7) and (2-8) the following results are

obtained,

12

and, (2-9)

or, (2-9a)

where equation (2-9a) expresses a measure of the amount

of elastic strain associated with any arbitrary end

displacements C>1 and 6 2 • Finally, if equation (2-9a)

is substituted into equation (2-3) the equation for p2

Page 24: Matrix computer analysis of curvilinear grid systems

13

becomes,

Using equation (2-5b), (p1 = -Hp2 ), p1 can now be defined

as,

This results in a set of equations in member coordinates,

(2-10)

'

which are similar to equations (2-1) in system coordinates.

These equations can be written in matrix form as follows,

= (2-11)

or, p = K6

where, K11 = HKHt, K12 = HK, K21 = KHt and

K22 = K, remembering that K = the inverse of F.

t It can also be shown that if K is symmetric that K12 = K 21 •

The symmetry of K can be verified by considering Maxwell's

Law.

Page 25: Matrix computer analysis of curvilinear grid systems

14

Because individual members of a structural framework

can be connected in any orientation relative to the system

coordinates, member forces and displacements must be

expressed in terms of system coordinates before the condi­

tions of compatibility and equilibrium can be applied in

assembling the complete stiffness matrix of the structure.

It therefore becomes necessary to derive a trans­

formation matrix to transform both p and 6 in member

coordinates to p' and 6' in system coordinates. This

can be accomplished with a general three dimensional,

rotation of axis transformation matrix of the type,

Y, y \ \ \

-" \ -\ --\ ---- X

, z.

i\11 A12 i\13 0 0 0

i\21 ?\22 i\23 0 0 0

i\31 i\32 (\33 0 0 0

T = (2-12) 0 0 0 i\11 Al2 A15

0 0 0 A21 ?-.22 i\23

0 0 0 A21 i\32 /\33

Page 26: Matrix computer analysis of curvilinear grid systems

where, A· . represents the cosines of the angles between lJ

the appropriate member and system axis. Since T is an

th 1 . . Tt -- T-1. or ogona matrlx lt follows that After T has

been defined,p' and 6' can be written as,

p' = Tp

(2-13) and, C) = T6.

Using (2-13), the equations (2-11) can be re-written as,

Pi t 6' t 6' = TK11 T - TK12T

1 2 (2-14)

-TK Tt 6' t 6' and, P2 = + TK22T

21 1 2

defining TK .. Tt = K! . results in an expression of the lJ lJ

form of Eq. (2-1)

The general form of the four system stiffness

matrices can now be written from equations (2-11) and

(2-14) as follows,

K]_1 = THKHtTt

K]_2 = -THKTt

(2-15)

K21 = -TKHtTt

K22 = TKTt.

15

Page 27: Matrix computer analysis of curvilinear grid systems

It can be shown that

making K' symmetric.

and,

K't 12 and K21 are equal

If K' is symmetric,

K' 21 = K't 12

K't = -TKHtT, 12

thereby

(K is symmetric, K = Kt) and the symmetry is therefore

verified.

2.3 Assembly of System Stiffness Matrix and Solution of Member Forces

The assembly of the system stiffness matrix from the

member stiffness matrices makes no further reference to

the elastic behavior of the material, but depends only

16

on the way the members are connected together along with

considerations of equilibrium and compatibility. Figure 2.3

illustrates a simple curvilinear grid which will be used to

illustrate how the system stiffness matrix is assembled.

Figure 2.3 Simple curvilinear grid.

Page 28: Matrix computer analysis of curvilinear grid systems

The principles involved are exactly the same for any

space frame. Consider any member "I" connecting nodes

Jl and J2, the member equations being,

17

(2-16)

Considering compatibility,

Equations (-16) can be re-written in terms of the displace­

ments of nodes Jl and J2 as,

which expresses the forces and moments at each end of

member "I" in terms of nodal displacements. From

equilibrium considerations applied nodal loads can be

equated in terms of member end loads at a given node as,

pJl = P11 + the contributions of any other

member at node "Jl",

and, pJ2 = p21 + the contributions of any other

member at node "J2".

Page 29: Matrix computer analysis of curvilinear grid systems

The load-displacement equations can be written for nodes

Jl and J2 as,

+ contributions of other members,

+ contributions of other members.

From the preceding equations the assembly scheme for

system stiffness matrix can be deduced.

Consider for example the structure in Figure 2.3.

Each node is capable of six degrees of freedom which

produces a displacement vector 6' having three trans-

lations and three rotations, a load vector p, having

three forces and three moments, and a 6 X 6 nodal stiff-

ness matrix, K' • ·rhe size of the system stiffness matrix

necessary to describe the four node structure in Figure

2.3 equals six times the number of nodes square or

24 X 24.

As an example, the load-displacement equation will

be written for node 1;

P1 = [CK22)l + (K22)3 + (K:i_1)4 + (Kll)6J 6].

+ ~K]_2)J 6 2 + 8Kl2)6] 63.

Similarly the equations for the other nodes are

p2 = EK21)4J 6i + ~K22)2 + (K22)4 + (K22)5

+ (K]_l )~ 6 2 + [CKl2)7] 64'

18

Page 30: Matrix computer analysis of curvilinear grid systems

P3 =[CK21)6J 6i + [CK22)6 + (K22)8 + (K:i_l)9

+ (K22)11] 6 3 + ~Ki2)9] 64,

P4 =[CK21)7]62 +~K21)9]63 + [CK22)7 + (K22)9 + (K22)10 + (K22)12J 64·

The preceding equations written in matrix form would

appear as,

pl K" 11 K" 12 K" 13 0 6'1

p2 K" 21 Kn

22 0 K" 24 62 =

p3 K" 31 0 K" 33 K" 34 83

lp4 0 K" 42 Ku

34 K" 44 CJ4

or as,

P = K" 6 ' '

where K" is the system stiffness matrix. The contri-

but ion that a single member makes to system stiffness

matrix can now be seen more easily from the preceding

equations. Consider member [§] • The direction of

member [§] '

as well as all other members, is considered

to be from the smaller node number to the larger node

number. Member [§] , therefore, has its l-end at

node (!) and its 2-end at node Cl) . The contribution

of member [§] then to the system stiffness matrix will

be as .follows;

19

Page 31: Matrix computer analysis of curvilinear grid systems

(1) (K{1 )6 will be added to Kll' the direct stiffness

of node @ ,

(2) (K~2 )6 will be added to K;3 , the direct stiffness

of node Cl) ,

(3) (Ki2 )6 = (K21 )~ will be added to the appropriate

off diagonal sti!!nesses K1 3 and K31 ,

which demonstrates the symmetry of the K" matrix. The

systematic nature o! the method of assembly of system

stiffness matrix lends itself well to computer

programming.

2.4 Pinned-End Rigid Foundation Attachment

The discussion thus far has been concerned only

with the fixed-end rigid foundation attachments with

no reference to the pinned-end or other types of

foundation attachments. The following discussion

explains the modifications in formulation, necessary

!or the treatment o! the non-fixed rigid foundation

attachment. The more common case of the pinned-end

rigid foundation attachment will be explained in detail.

The pinned-end case could be handled in a manner

similar to what is done in slope deflection solutions,

where modified end equations are developed by presolving

the general slope equations of a member so as to

eliminate the unknown displacements of the pinned-end.

This reduces the number of unknowns which one has to

20

Page 32: Matrix computer analysis of curvilinear grid systems

solve for and simplifies the solution. In the case of

matrix methods, however, such as the equilibrium method

where the high speed computer is being used to solve

the problem it is desirable to preserve the general

nature of the solution as much as possible so that the

programming of the method of solution can be accomplished

in a straightforward manner. The load-displacement

equations (2-1) expressing the end-reactions of a member

in terms of the end-displacements of that member are

genera.l in nature and are still equally valid even though

some of the end displacements and end reactions may be

zero, as is also the case in the general slope deflection

equations. With this in mind the following treatment of

the pinned-end foundation attachment can be seen more

readily.

21

In the equilibrium method the "system stiffness

matrix• is generated as though the pinned-end foundation

attachment was like any other node in the structural

system. Then the rows corresponding to zero joint

displacements are altered. This is done simply by placing

l's on the leading diagonal of the system stiffness matrix

and setting all other coefficients in the rows equal to

zero. The l's on the diagonal are necessary in order to

prevent the equation solving routine trom being upset by

zeros on the diagonal. Symmetry of the system stiffness

matrix can be maintained by placing zeros in the appro­

priate columns.

Page 33: Matrix computer analysis of curvilinear grid systems

Similar adjustments in the system stiffness matrix

can be made to handle other types of foundation attach­

ments.

2.5 Intermediate Span Loads

22

The treatment of loads applied at points other than

node points can be handled in a straightforward manner by

the use of the principle of superposition. It is, there­

fore, necessary to assume linear behavior of the structure

since the principle of superposition is only valid for

structures which behave linearly.

The analysis would precede in the following manner,

the loaded span in question would first be considered

fixed at each end and the forces and moments necessary to

prevent any translation or rotation of the ends of the

member would then be computed as in Figure 2.4a. Next,

the sense of these forces and moments are reversed and

applied to the ends of the loaded member, thus replacing

the intermediate span loads with a system of "equivalent

fixed-end forces and moments• as in Figure 2.4b. These

fixed-end forces and moments are then combined with any

other forces or moments applied directly to the nodes at

the ends of the member, resulting in the final nodal load

vector. It is necessary not to forget that before the nodal

load vector can be incorporated in the solution of the

structural system it must be transformed to system

coordinates.

Page 34: Matrix computer analysis of curvilinear grid systems

w k/.f:t.

_....,..,.._ __ _;,Hz

r~Mz Vz

Figure 2.4a Fixed-end forces and moments on the loaded member.

H, -~-----

2.4b Equivalent nodal loads

23

An additional assumption which can be made to simplify

the solution of the fixed end forces and moments is that

the intermediate span loads lie in the plane of the member,

however, the nodal loads may be applied in any orientation.

Page 35: Matrix computer analysis of curvilinear grid systems

Chapter 3

SEGMENTAL CIRCULAR MEMBER

3.1 Geometric Properties of a Segmental Circular Member

24

Although the stiffness method will be used to analyze

the curvilinear system, the member flexibilities will be

derived first and then the member stiffness matrix will

be obtained ·by inverting the member flexibility matrix.

The geometry is as follows,

Pyz

myz

G .., l>xz

mxz

e

5 5

Figure 3.1 Geomerty of the segmental circular member

S = one-half member span

R = radius of member

e = vertical distance from focus to end of member

~ = one-half of the total angle subtended by the member

Page 36: Matrix computer analysis of curvilinear grid systems

The variables x and y expressed in terms of geometric

constants are,

x = S - R sin9

y = R cose - e

ds = Rd9

S = R sin ~

e = R cos ~

3.2 Load-Displacement Equations Derivation

The load displacement equations will be derived

using Castigliano's Second Theorem,

au = u. J..

op. J..

which says that the first derivative of the energy

expression, 1J , with respect to p. equals the corre­J..

(3-l)

spending displacement u .• Energy due to bending, torsion J..

and axial deformation will be considered in the following

derivation, neglecting the effects of shear since members

will generally be light and flexible.

The general expressions for moments at any point

along the member about an x, y and z axis are,

about the "x" axis, M = -p y + m X z X

M = -p X + m y z y about the "y" axis,

M = PxY + p X + m X y z

about the "z" axis,

25

Page 37: Matrix computer analysis of curvilinear grid systems

In order to be able to write the general energy

expression for the member, the forces and moments must

be expressed with respect to the major axes of the cross­

section at any point along the member. (Figure 3.2)

y

yN

Mx G X

N

Figure 3o2 Forces and moments on major axes.

The moments and forces with respect to the axis in

Figure 3.2, are,

a) Axial Force,

N = p cos9 - p sin9 X y

b) Torsion,

= M cose X

- :M y sin9

26

N

Page 38: Matrix computer analysis of curvilinear grid systems

c) Moment about nzn axis,

Mz = p y + p X + m X y z

d) Moment about nyN II axis,

MyN = M sin9 + M cose • X y

The previous equations can now be written in terms of

the end forces and moments, and the geometric constants

as;

a) N = p cos a - p sine X y

b) MT = Pz (S sin9 + e cose -R) + m cose - m sinS X y

c) M = p (R cos9 - e) + p (S - R sine) + mz z X y

d) MyN = p (e sin9 - s cos~ ) + m sinS + m cose. z X y

3.3 General Energy Expression

The general energy expression can now be written as,

/M~ds + 2G!

N

The deflections corresponding to the six degrees

of freedom are,

au aP ' X

au ap ,

y

au oP ' z

27

Page 39: Matrix computer analysis of curvilinear grid systems

au am '

X

au om ' y

au

The following Table 3.1 which tabulates the partial

derivatives of N, MT' Mz and MyN with respect to the

various coordinate forces and moments can be very helpful

in setting up the various integrals.

TABLE 3.1

c3N aMT oM z oMyN

apx cos a 0 (R case 0 - e)

aPy -sinS 0 (S 0 - R sin9 )

oPz 0 (S sine + e cos9 - R) 0 (e sine

- s case

am X

0 case 0 sine

om 0 -sin9 0 case y

am 0 0 l 0 z

3.4 Deflection Calculations

The deflections will now be calculated assuming

that members have constant cross sectional areas and

that IN is the equivalent polar moment of inertia for

the section.

28

)

Page 40: Matrix computer analysis of curvilinear grid systems

1) The deflection in the x-direction is,

-JN oN ds 6x - c3Px AE +

6x = !E J (px cos2e - py sine cose) de

+ ~rzjr[Px<R cose -e) + py (S- R sine)

+ mJ ~ cose - e] d9

after integrating and simplifying, the results are

R p R3 6 = Px (~ + ~ sin 2~) + x (0 - -23 sin2¢

X IT' c:. EIZ

(2 sin¢ - 20 cos~).

2) The deflection in the y-direction is,

29

Page 41: Matrix computer analysis of curvilinear grid systems

= !E f (px cose - py sine ) (-sine ) d9

+ ~Iz /!!x (R cose - e) + py (S - R sine ) + mJ

~ - R sine] de ,

after integrating and simplifying, the results are,

3) The deflection in the z-direction is,

JMToMTds J oMNds 6= +My __ , z aPz UIN yN aPz EiyN

~ = ~IN f~z (S sin9 + e cos9 - R) + mx cose

- my sineJ [s sin9 + e cose - R_] d9

+ my cos!) [e sine - s cose J d9

30

Page 42: Matrix computer analysis of curvilinear grid systems

after integrating and simplifying, the results are,

3 m R2 = pzR (3¢ + ~ sin4¢ - 2 sin2¢) + GI (¢ cos¢ G~ N

m R2 - 2 sin¢ + ~ cos¢ sin2¢) - if:-C¢ sin¢

N

R3 - -21 sin¢ sin2¢) + Pz (¢ - l sin4¢)

EiyN 4

m R2 m R2

+ EI (¢ cos¢ - ~ cos¢ sin2¢) - ~(¢ sin¢ yN yN

+ ~ sin¢ sin2¢).

4) The rotation about the x-axis is,

+ e cose - R) + m cose X

- s cose ) + mx sine + my cose] [sine] de '

31

Page 43: Matrix computer analysis of curvilinear grid systems

after integrating and simplifying, the results are,

p R2 = GI (~ cos~ - 2 sin~ + ~ cos~ sin2¢)

N

m R p R2 + rrf:C¢ + ~ sin2~) + EI (¢ cos~ - ~ cos¢ sin2~)

N yN

m R 1 + EI (¢ - 2 sin2¢).

yN

5) The rotation about the y-axis is,

ey

9y

J aM J oM~N ds = M __! ds + M Tamy m; yN amy ElyN '

= ~rNJ l_pzcs sinS + e cose - R + m cose X

- ~ sin!] [-sin~ dEl + ~I f Q> z ( e sine yN)I

- s cose ) + mx sin9 + my cos~ GoseJ de ,

after integrating and simplifying, the results are,

-p R2 m R GIN (0 sin0 - ~ sin0 sin20) + trf;C0 - ~ sin2~)

p R2 m R - EI (~ sin¢ + ~sin~ sin2~ + ~(¢ + ~ sin2¢). yN yN

32

Page 44: Matrix computer analysis of curvilinear grid systems

6) The rotation about the z-axis is,

e = JM aMz ds z z 0 m rr­z z

after integrating and simplifying, the results are,

R2 p R2 Px ~ 9z = EI (2 sin¢ - 2¢ cos¢) + ~(2¢ sin¢)

z z

m R - rl-C2¢).

z

3.5 Flexibility Matrix

Now that the deflections and rotations of end 2 of

the member have been found in terms of the six degrees

of freedom, the flexibilities f .. can be found, according l.J

to definition, by setting the j~ force equal to unity and

computing the i~ displacement (i = 1, 2, ••• 6)when the

other forces and moments are set equal to zero. Flexi-

bility f .. can also be found by, l.J

f .. l.J

(3-2)

33

Page 45: Matrix computer analysis of curvilinear grid systems

which is equivalent to the definition previously stated.

Now for simplicity let;

Px = pl m :: p4 6x =~ e = e X X 4

Py = p2 m = p5 6 =6 ey =e 5 y y 2

Pz = p3 m = p6 6z = 63 9z =e z 6.

The elements of the resulting flexibility matrix will

then be;

R (~ - ~ sin~) + 3

- ~ sin2~ + 2~ sin2~) f22 R (~ = -AE Er z

R3 - 2 sin2~ + k sin4~) R3

(~ - l sin4~) f33 = GI:"(3¢ + ~I N yN 4

R + ~ sin2~) +

R (~ - l sin2~) f44 = GI (~ EiyN 2 N

R - ~ sin2~) +

R (~ + ~ sin2~) f55 = GI (~ EiyN N

R = Er(2~)'

z

which are the diagonal elements of the flexibility matrix.

34

Page 46: Matrix computer analysis of curvilinear grid systems

The off diagonal elements of the flexibility matrix

are;

3 = ~(2 sin2~ - ~ sin2~

z

fl3 = f31 = fl4 = f f f 0 41 = 51 = 15 =

2 f 61 = f 16 = ~(2 sin~ - 2~ cos~)

z

2 f 34 = f 43 = ~IN(~ cos~ - 2 sin0 + ~ cos0 sin20)

R2 1 + EI (~ cos0 - 2 cos0 sin20)

yN

R2 1 = - ~(~ sin0 - 2 sin0 sin2~) N

R2 1 - EI (0 sin0 + 2 sin0 sin20). yN

As can be seen a considerable number of the off diagonal

elements of the flexibility matrix are equal to zero,

which makes finding the inverse of the six by six much

easier than if the matrix was completely full.

35

Page 47: Matrix computer analysis of curvilinear grid systems

Finally, the assembled member flexibility matrix

written in matrix form would be,

fll fl2 0 0 0 fl6

f21 f22 0 0 0 f26

0 0 f33 f34 ~5 0

0 0 f43 f44 0 0

0 0 f53 0 f55 0

f61 f62 0 0 0 f66 '

and it is evident also that the flexibility matrix is

symmetrical. ~e K matrix in equation (2-3) can now

be computed by inverting F. This K corresponds to

K22 in Equation (2-11). If the equilibrium matrix is

known, K11 , K12 , K21 can be computed. These K's, how­

ever, are still in member coordinates and before they

are transformed into system coordinates, the trans­

formation matrix T must be derived.

3.6 Three Dimensional Axis Rotation Transformation Matrix

In order to keep the formulation of system stiffness

matrix general in nature, the transformation matrix, T,

will be derived for a member whose axis is skewed to all

three system axes, as indicated in Figure 3.2.

36

Page 48: Matrix computer analysis of curvilinear grid systems

From

and,

y'

;-------~----------------~----x I I l I

....... I ....... ............... I

.............. I ........ ....... ........ I

-...J

Figure 3.3 Typical member orientation

equations (2.13) for example,

p' = Tp

6' = To

or in matrix .form,

p' X A11 A12 .i\13 Px

p' = "21 i\22 /\23 Py y

p' z A31 /t32 ?03 Pz

37

I

Page 49: Matrix computer analysis of curvilinear grid systems

where i\11 , A12 , ••• etc. are direction cosines. It can

be shown that T is an orthogonal matrix thereby making

T-l = Tt so that

and,

Ttp, p = (3-1)

The derivation of the transformation matrix T can now

precede in a systematic manner by considering Tt as the

product of three individual rotation transformation

matrices Tcx , T,B and T7 corresponding to the three

rotations which must be performed required to transform

from member to system coordinates as shown in Figure 3.3.

In each row of Tt is located the direction cosines of the

corresponding member axis.

38

Page 50: Matrix computer analysis of curvilinear grid systems

39

y I

Y, y"

x,x,..

Sid xi.

Figure 3.4 The three required rotations

Let a x' a and a equal the direction cosines of x.

y z

Then,

XJ2 - XJl a YJ2 - YJl . a =

ZJ2 - ZJl a = = ' X s y s z s

where,

Page 51: Matrix computer analysis of curvilinear grid systems

t Row 1 of T equals a , a and a which are the

X y Z

direction cosines of the x axis and can be found directly

from the end coordinates of the member. The last two

rows can be found by considering j3 , 7f and Ol rotations.

Consider first the)3 rotation and T~ where,

cos.B 0 sin,.d

= 0 1 0 (3-2)

-sin,B 0 cosj!J

The elements cosfi and sin,8 can be expressed in terms

of a , a and a as follows, X y Z

sinfj a

z

The system forces have now been transformed to the axis

where,

P,.s = T,s p'

Next the /3 -axis will be rotated to the o-axis or

i.e. ' the /3 -forces will be transformed to r oriented

forces.

cosT sinr 0

-sinT cosT 0 (3-3)

0 0 1

40

Page 52: Matrix computer analysis of curvilinear grid systems

where,

cosT = / ax2 2 '\/ + az ' sinY = a ,

y

so that the system forces have now been transformed to

the T-axis as,

p ')- = T "l" P,s

or,

Finally, the ex -transformation, where ex. is the rotation

of they-axis of the member with respect to Yy-axis

about the member x-axis and is part of the input data.

1 0 0

0 cos« sin ex. (3-4)

0 -sin ex coso<.

The member forces can now be expresses as,

or, using Equations (3-2), (3-3) and (3-4),

p = Toe TT T,s P'

where, Tt = TLX T# Tft

and, p = Ttp'

or, p' = Tp •

41

Page 53: Matrix computer analysis of curvilinear grid systems

In a similar manner the member stiffness matrix can be

transformed to system stiffness matrix by,

K' = TKTt.

Now if the appropriate terms for cos~, sin,.d , cos "r,

sin"( are substituted into the appropriate matrices and

the indicated multiplications of T«. T't' T13 are carried

out the final form of Tt will be as follows,

where,

A11 = a X

a a COSO( - a sin()(

tu2 - X if. z

=

ja2+a2 X Z

a a sin ex - a COSO(

'A13 X l, z

=

j 2 2 + a ax z

A21 = a y

2' =~ ax2 + A22 a cos~ z

2' A23 ;j ax2 sinO(. = + a z

42

Page 54: Matrix computer analysis of curvilinear grid systems

43

-a a cos~ + a sinO£ /\32 = -:I. z X

~ ax2 + 2

a z

a a sinO<: + a co sac::

/\33 = J. z X

,J ax 2 2

+ a • z

Page 55: Matrix computer analysis of curvilinear grid systems

Chapter 4

APPLICATION OF ANALYSIS

In this chapter the information obtained from

Chapters 2 and 3 will be applied to the analysis of

"curvilinear space grids". The details of the computer

program, which performs the necessary calculations, are

discussed in the following chapter. The objective of

44

the material in this chapter is to demonstrate the validity

of the solution and to develop confidence in the analysis.

4.1 Procedure

Three different mathematical models were chosen to

demonstrate the analysis. These models are circular

framed dones having height to span ratios, (h/L), of one­

sixth, one-fourth and one-half respectively, with each

one having a span of 72.0 inches.

Each of the structures were analyzed under the

influence of symmetric and unsymmetric loads. In one

case, all foundation attachments were fixed, while in

the other case half of the foundation attachments were

fixed and half were pinned. The details of the mathe­

matical models can be seen clearly in the diagrams

which follow in (4.2).

Finally, an experimental model was build and tested

in order to provide the necessary correlation between the

Page 56: Matrix computer analysis of curvilinear grid systems

analytical solution of the mathematical model and

experimental results from the physical model.

4.2 Mathematical Models

Each of the mathematical models are composed of

twenty-four segmental circular members, whose topological

arrangement describes a "lattice dome". All of the

members lie on the arc of a great circle. The model

dome has nine interior nodal points and twelve foundation

attachments.

a.) Mathematical Model 1- The computations involved

in obtaining the geometric data will be shown in

detail for this model as an example of the required

hand calculations, and subsequently deleted from

the remaining models as they are handled in the

same manner.

1.) Basic Geometry:

h = 1 L 72.0" h = 12.0" I:' 6 ' = '

R = ~ [1 + 4(~)2 J :r;

R = 60.0"

45

Page 57: Matrix computer analysis of curvilinear grid systems

+l.

2.) Plan View- Figures 4.1 and 4.2 illustrate the

node and member numbering scheme used in the

analysis of the model with fixed foundation

attachments and combined fixed and pinned

foundation attachments.

z ~ 5 6

z --:-

8 I 9 ~ II 4 IZ 5 13 ~ >"' ---

/5 ~ 16 ~

.... 8 _.:a.

18 19 zo

t 1 Z4 2'3

+X

Figure 4.1 Mathematical Model-l (~ = ~) , all

foundation attachments fixed.

46

Page 58: Matrix computer analysis of curvilinear grid systems

+~

z ~ 4 5 6 .,.. ~ 5 ~

8 t 9 I j 10

II 7 /Z. 8 /3 9 14 - >" >"'" .....

15 ~ /6 ~ J 11

II ..-::.

19 zo Zl

Z3 ~

+>'

Figure 4.2 Mathematical Model-l (~ = i) , with

both pinned and fixed foundation

attachments.

47

Page 59: Matrix computer analysis of curvilinear grid systems

3.) Model profile:

h .. :: 12.0

e= 48.0 II

Figure 4.3 Basic coordinate dimensions

9 = s1"n-l L/2 = 36.87° R

hl = R sin (90° - 2¢) =

dl = d2 + d3

56.92

dl = R cos (90° - 2¢) = 18.97

d3 (h -dl

in. = e) n:- = 2.97 1 1

d2 = d - d = 16.0 in. (See 1 3

in.

in.

Fig. 4.1)

48

h,

Page 60: Matrix computer analysis of curvilinear grid systems

4.) General coordinates of nodes 1 3 7 9 ' ' '

Figure 4.4 Geometry of 1, 3, 7, 9 node points.

OAB = 60.0 in.

AB = 60.000 - 53.066 = 6.934

Ax = Az = 16

6 • 934 53.066 =

48 Y = 6.934 53 •066 = 6.27 in.

in.

in.

2.09 in.

The resulting coordinates of B without regard to

sign are,

x = z = 16.0 + Ax = 18.09 in.

Y = 6.27 in.

49

Page 61: Matrix computer analysis of curvilinear grid systems

50

5.) General coordinates of nodes 2, 4, 6, and 8 are,

x = z = d1 = 18.97 in. (See Fig. 4.3)

y = h1 - e = 8.92 in.

6.) Member-¢- Calculations

- = 4

¢1 = 0.160877 rad.

¢2 - Members 5, 6, 8, 10, 15, 17, 19, 20

where, s2 = one half the chord length of the

member.

Then,

2s2 = ,/c.8s)2 + (2.65)2 + (18.091)2 • 18.305 in.

¢2 = sin-1 18.gg5/2 = 8.774o

¢2 = 0.153135 rad.

¢ - Members 1, 3, 4, 7, 18, 21, 22, 24

Page 62: Matrix computer analysis of curvilinear grid systems

where, 83 equals one half the chord length of

the member.

Then,

51

283 = ,j(l4.16)2 + (6.27) 2 + (2.09)2 = 15.625 in.

-1 = sin 15.625/2 • 7.480 60.0

~3 = 0.13055 rad.

7. ) Member - tX- computations

'

' \

Figure 4.5 Required geometry !or ~.

Page 63: Matrix computer analysis of curvilinear grid systems

52

Computations continued,

(See Fig. 4.3)

a1 = 60 sin (81.23°) = 59.30 in.

c1 = 59.3 sin (18.43°) = 18.75

ri = Jc9.15)2 + (18.75)2 = 20.864

0( • -1 20.864 - 20 350 1 = sln 60.0 - •

()(. = • 3 5517 rad. 1

a2 = 60 sin (54.97) = 49.13 in.

b2 = 60 cos (54.97) = 34.44 in.

c2 = 49.13 sin (18.43) = 15.53 in.

r2 =~(34.44)2 + (15.53) 2 = 37.727 in.

~ = sin-1 37.727 = 38.96o 2 60.0

0(2 = .67998 rad.

Page 64: Matrix computer analysis of curvilinear grid systems

4.3 Example Computer Analysis

The computer solution of Mathematical Model-l, with

fixed foundation attachments and symmetrically loaded is

presented here to illustrate the computer output.

The input data, such as coordinates, member

properties, nodal data and nodal loads is printed first.

The input data is followed by the computed data such as

the "Link" array, a sample flexibility, stiffness and

transformation mat~ix, the nodal displacements and the

member-end forces and moments in both system and member

coordinates.

The computer solutions for the other mathematical

models are presented in Appendix A.

53

Page 65: Matrix computer analysis of curvilinear grid systems

~]1(\A'lf •r ~IIJT"lf<:; (} ~''fV1'1r.~ '''""" ,..,~,..nFJ.>(, ?4 ~l'l~!ll·• I I 1 1 1\fl{''~ ffl~''llTP""'f\' l ~AI\)( I VI!'~ ~.~~I~·~PrP f1f ~n·•.R~f{_~ Pf_~·--t~qfl~ 4

., 1.

1'

'I

"•

I' 11 1, 1 0

1 !,

l'

'!,

' ~ .) -'

'I

''•

Y( f t 11

-17 • ..,'-00'10 - v. ·1(1:1001/ -~?. '~'lonr• -'-I~. ·1nrmrl'1 -1 P • OPll(}~l -1 Pj. q(,f)OAf

-u. 'n'J'lflfl -tn.nqn'111f, -) ~- • qt. C)Oq(, - J,... • ~!H)O()I..

n.r;

~:~ ' " , ... ,..,

~'·" "·rl 1 ,, • f)'l')C\01)

tA.flf"l10t)~ 1 n • .,,_oq·o-r,· ll o IJr•)t)')') 1?. ')!17,.1()1)('

11-. ""qnnr ~ ~. -,c:;_.,nnf'

! X

'. ')(\')~~·"· ~ • "'"P1'i<;l')" .1. lrfl<;<.,n ''• ')f)'l<;<.,~ .... 1f'I0!1C::(l f' • "'H"'ll1'"•"r'l '"'.f)f'\'1'-.'"-.f) ,, !)(',,"1~0 f·: 1('11'\ •,I" ".nn"tlr,t;,.. ""• '1"''1~:;;.c:-;r• ,, • fl" 1'1 r,(\ ,. • '1(' ')C, en rJ.'1'1'1f)!';f' ,'\ ''0 ")CII"'\

- • '~ r) ) ' ; ,..., ., • •n l.., ... r) ": "'~n'1'1"i'1 {' • ')1'11; r,,

'1. ')() )r;r,n

1(' '""•'.(' ,,..pr.c-f"

·• ·:r '" ','' '• '}'1 )C::C(I

~fT.?!

-1 P .• OP'>q')l, -1 R.'ln'l?~~ -1 rt. (iP,")·'lQ.t, ~yo.n?q'1~~ -J.Il."1Ar1'H~,C.,

-1 •.nw>'l'l~ -1 o. flR')'J'l':>

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Page 68: Matrix computer analysis of curvilinear grid systems

57

4.4 Experimental Model

For simplicity the experimental model was designed

with four interior nodes and eight foundation attachments,

while consisting of twelve members •. The dimensions given

for the experimental model are the true measured

dimensions, as, there was some discrepancy between the

original design dimensions and the finished model. This

can be expected, however, from a model of this nature.

a.) Material and Member Properties- The model was made

from one fourth inch square steel rods. The

geometric properties o! the members are as follows:

1.) Polar moment of inertia, Ix*' is

where 1 b b4

13 ~- - o. 21 -h (1 - ) ' 3 12h~

and since b = h for a square section it follows that

/3 ~.1418 '

and if h = 0.25 in.,

• 00055 in • 4 IX = •

*(See appendix c, of reference 2) Here Ix is the

equivalent polar moment of inertia and is the same as

the previously defined, ~·

Page 69: Matrix computer analysis of curvilinear grid systems

2.) Moment of inertia about they and z axis is

b4 4 I = I = ~ = 0.000326 in. • y z ~~

2 Cross-sectional area equals b , or

Area= o.0625 in. 2•

4.) Young's modulus, E, was determined from a

tension test of the material. The results of

this test are as follows:

strain= 0.00061 in./in.,

load p = 1200.0 lbs.

therefore,

E = strainpx area = 31,475,000 psi

5.) The shear modulus, G, was assumed as,

12,000,000 psi.

58

Page 70: Matrix computer analysis of curvilinear grid systems

b.) Geometry and Numbering Scheme for the Model

.3

6 7

10

~ IZ

Figure 4.6 Experimental model with pinned foundation attachments.

The coordinates for each of the members are given

in Table 4.1.

59

Page 71: Matrix computer analysis of curvilinear grid systems

4.5 Experimental Results

Three tests were run on the experimental model in

which it was subjected to both symmetric and unsymmetric

loads, for both pinned and fixed end foundation attach­

ments. In each of the tests the strain in member-12

at 6.5 inches from node 4, and the vertical displace­

ment at each of the nodes were measured. Because o! the

difficulty encountered in measuring the true vertical

disp~acement of the node, these values are not too

accurate. The following is a summary of the three tests.

a.) Test No. 1

Foundation attachments: all pinned

Load: 30.0 1bs. at each node

Strain in mem.-12: -6 175.0 x 10 in./in., ten.

Nodal displacement: 0.027 in. ave.

2.) Theoretical calculations:

Member end forces on member-12 at End-1,

in member coordinates are

Px = 34.05 lbs. m • o.o X

Py • -1.32 lbs. m - 1.08 in.-lbs. y

Pz • -0.071 lbs. m • -20.06 in.-lbs., z

60

Page 72: Matrix computer analysis of curvilinear grid systems

61

and at End-2,

Px = -34.05 lbs. m = o.o X

Py = 1.32 lbs. m = o.o y

p = 0.071 lbs. m = 0.0 z z

Nodal displacements: 0.022 in. ave.

3.) Correlation of experimental stress in member-12,

to the theoretical stress, neglecting Pz and

m· y'

1 /.3Z

34.05

e

Figure 4.7 Free body diagram of Member-12.

e' - ~ - ~ = .1857 = 10.6° - R - 35

f6 - a• = 12. 51 - 10. 6 = 1. 91 o

h' = 35 cos (1.91°) = 34.98 in.

Page 73: Matrix computer analysis of curvilinear grid systems

e = 35 sin (77.49°) = 34.17 = 0.81 in.

x = R sin (12.51°) -sin (1.91°) = 6.41 in.

The moment at the strain gage is,

M = 20.06 - 34.05 (.81) - 1.32 (6.41)

M = 15.98 in.-1b.

Axial = 34.0 #, compression.

The resulting stress are,

34 Axial stress = •0625 = 544 psi, C

Bending stress = 15.98 (.125) = 6127 psi, T .000326

Total stress = 6127 - 544 = 5583 psi, T

4.) %-Deviation between experimental and

theoretical stress:

Exp. stress = 175.0 x 10-6 (31.475 x 106 )

II II = 5508 psi,

Therefore,

~ D 5583 - 5508 x 100 = 1.36% 10 ev. = 5508

62

Page 74: Matrix computer analysis of curvilinear grid systems

Table 4.1 Member Coordinates

Mem. X(I,1) Y(I,l) Z(I,l) X(I,2) Y(I,2) Z(I,2)

1 -20.97 o.o 5.8? -7.29 6.25 7.22

2 -20.97 o.o -6.62 -?.23 6.25 -?.33

3 -6.06 o.o 20.9? -?.29 6.25 ?.22

4 -7.29 6.25 ?.22 -7.23 6.25 -7.33

5 -7.23 6.25 -7.33 -6.25 o.o -20.9?

6 -7.29 6.25 ?.22 7.22 6.25 7.29

7 -7.23 6.25 -?.33 ?.19 6.25 -7.19

8 6.06 o.o 20.9? 7.22 6.25 7.29

9 7.22 6.25 7.29 ?.19 6.25 -7.19

10 7.19 6.25 -?.19 6.12 o.o -20.97

11 7.22 6.25 ?.29 20.97 o.o 6.31

12 7-19 6.25 -7.19 20.97 o.o -6.31

b.) Summary of Tests- A summary of the experimental

results for Test No. 1, as well as Test No. 2 and

Test No. 3 are given in Tables 4.2, 4.3 and 4.4

respectively.

63

Page 75: Matrix computer analysis of curvilinear grid systems

Table 4.2 Summary of Test No. 1 - Pinned-End Foundation Symmetric Loading

- Experimental -

Nodal Displacements

Load/node 1 2 3

30.0 lbs. -0.027 -0.029 -0.027

- Theoretical -

30.0 lbs. -0.021 -0.023 -0.022

Mem.-12- Strain= 175.0 x 10-6 in./in., T

Experimental Stress= 5508.0 psi., T

Computed Member-12 End Forces

Px py p m m End z X y

1 34.05 -1.32 -0.07 o.o 1.08

2 -34.05 1.32 0.07 o.o o.o

Theoretical Stress= 5585.0 psi., T

% Deviation = 5585 - 5508 X 100 • 1.36% 5508

4

-0.027

-0.022

m z

-20.06

o.o

64

Page 76: Matrix computer analysis of curvilinear grid systems

Table 4.3 Summary of Test No. 2 - Fixed-End Foundation Symmetric Loading

- Experimental -

Nodal Displacements

Load/node 1 2 3 4

31.08 lbs. -0.015 -0.017 -0.017 -0.014

- Theoretical -

31.08 lbs. -0.012 -0.013 -0.012 -0.012

-6 Mem.-12- Strain= 135.0 x 10 in./in., T

Experimental Stress = 4280.0 psi.

Computed Member-12 End Forces

px py pz m m m End X y z

1 38.32 -0.15 -0.11 0.69 0.85 -21.06

2 -38.32 0.15 0.11 -0.69 -0.80 18.76

Theoretical Stress = 3729.0 psi.

% Deviation 4280 - 3722 X 100 = = 4280-- 12.9%

65

Page 77: Matrix computer analysis of curvilinear grid systems
Page 78: Matrix computer analysis of curvilinear grid systems

~able 4•4 Summary of Test No. 3 - Fixed-End Foundation Uns~etric Loading, Load Node 4 Only

----- Experimental -........._.,__ __

-.....__ __ Nodal Displacements

JJOad 1 2 3 ,_____ :;1.08 ll:>S. -0.0240 +0.030 +0.028 ~---

-Theoretical -.............,._

:;l.oB los. -o.o2o +0.024 +0.024 "-----

-6 Me~.-12 - strain ~ 55 X 10 in./in.

E~e~i~enta1 stress = 17~1 psi, T.

Computed Member-12 End Forces

:En<i Px p Pz m my y X

1 29·45 1·55 -0.14 o.o 1.06

2 -29·45 -1-55 0.14 o.o 1.08

~~o~etica1 Stress ~ 1800 psi

% be~iation 1800 - 1.2~~ X 100 = ~.98% ~ -' 1731

mz

-4.4

27.87

4

-0.051

-0.041

~e computer solUtions for the experimental model

-tS ~ p~~sented in Appendix B.

66

Page 79: Matrix computer analysis of curvilinear grid systems

Chapter 5

COMPUTER PROGRAM FOR CURVILINEAR GRID SYSTEM

The computer program which performs the complex

computations required by this or any matrix solution to

a large structural system is an integral and extremely

important part of the development. This chapter contains

a detailed description of the development of the computer

program including a complete documentation of the program

including user instructions, flow diagrams, summary of

program identifiers, and a complete listing of the pro­

gram and subroutines.

5.1 Introduction to the Program

Matrix Analysis of Curvilinear Systems (MACS), is

written in Fortran IV for IBM System 360/40. The

formulation of MACS is fundamentally an equilibrium­

stiffness formulation. The program has been developed

in two main parts; first the main line which consists

of a general formulation of the equilibrium-stiffness

method adaptable to the solution of any space frame,

and second the subroutine package which consists of the

necessary routines for performing the required repeti­

tive calculations as well as those routines which enable

MAcs to be quite flexible as a space frame solver. The

details of these routines will be discussed in (5.4).

67

Page 80: Matrix computer analysis of curvilinear grid systems

In order for the engineer to use MACS it is only

necessary that he provide MACS with the appropriate

input data such as, Node data, geometry data, member

properties and loading data as described in (5.2).

5.2 Input Data

The following is a detailed description of the

necessary input data.

a) System Indices- NN, NB, LL (Fixed pt. no.)

NN - Number of nodes excluding fixed and foundation attachments.

NB - Number of members in the structure.

LL - Maximum number of members per node.

b) Member Indices

Nodeil - Node number at l-end of member I.

Node12 - Node number at 2-end of member I.

c) Member Coordinates

Xil' Y;l' Zil -Coordinates of the l-end of • member I in system coordinates.

Xi2 ' Y; 2 , z; 2 - Coordinates of the 2-end of • • member I in system coordinates.

d) Member Properties

IX., IY., IZ. - Moments of inertia about the 1 1 1 member X, Y and Z axis.

- Cross sectional area of member

e) Geometric Properties

- Radius of curvature of member

68

Page 81: Matrix computer analysis of curvilinear grid systems

ALPH. 1

- One half of central angle described by the member

- The rotation of the member about the member x-axis with respect to a vertical plane through its end points.

f) Elastic Properties

E

G

g) Nodal Loads

D. J

5.3 Output Data

- Youngs Modulus

- Shear Modulus

- Six element vector which describes Px' Py' Pz' mx' my' mz' the six possible components of the applied nodal load vector.

The output data from MACS was designed to give the

engineer all the information necessary for establishing

the validity of the solution.

a) Input Data - Before any structure can be analyzed

correctly the correct input data must be used.

This is a common source of error in an analysis

of this type where large quantities of data are

assembled, coded and finally key punched onto

data cards. As a result it is quite easy for

human error to be a significant factor. For this

reason all of the input data is printed out in a

convenient form to enable the engineer to verify

that the data read by the computer is the correct

data.

69

Page 82: Matrix computer analysis of curvilinear grid systems

b) 6 Link Array - The first computation performed by

MACS computes,

Link (J, L) = + I, where I is the L~ member to be attached to node J. The plus sign indicates that the l-end of member I is at node J, the minus sign indicates that the 2-end of member I is at node J.

Link (J, L) provides MACS with the necessary member

to node reference required for computing which

members contribute to the stiffness of a particular

node.

c) Member Flexibility, Stiffness and Transformation

Matrices - The flexibility, stiffness and trans­

formation matrices for each member are printed out

to provide the engineer with information necessary

for developing a better understanding of the

behavior of the system. The member stiffness

matrix, for example, will show the contribution

of each of the quantities such as axial, torsional

and bending deformations to the overall member

stiffness.

d) System Stiffness Matrix - The system stiffness

matrix furnishes additional information on the

structural system as a whole, being the coef­

ficients of the load-displacement equations for

the structural system.

?0

Page 83: Matrix computer analysis of curvilinear grid systems

e) Nodal Displacements - After the system stiffness

matrix has been generated, the nodal loads and the

system stiffness matrix are then solved simul­

taneously by S~LVE to obtain the nodal displace­

ments. The six components of the displacement of

each node are written out as follows,

6y 6z By 9z

f) Member End Forces - The resultant force vector at

each end of the member are first printed out in

System Coordinates to facilitate checking the

statics of the structure and then printed out in

member coordinates· which is more convenient for

stress analysis.

5.4 MACS Subroutine Package

The following discussion describes the subroutines

required by MACS to perform the necessary repetitive

calculations. These subroutines have been appropriately

named STIFMA, MATRAN, MTXMUL, TRIPR¢ AND S~LVE.

a) STIFMA - The member stiffnesses are computed by

calculating the member flexibilities from the

equations derived in Chapter 2 and inverting the

resulting flexibility matrix. STIFMA also computes

the equilibrium matrix H, which is described in

Chapter 2.

71

Page 84: Matrix computer analysis of curvilinear grid systems

b) MATRAN - The 3-axis rotation transformation

matrix T is computed by MATRAN from the member

end coordinates and ALPH which was described

earlier in this chapter.

c) MTXMUL - Matrix multiplication is performed by

MTXMUL; given two matrices A and B. MTXMUL

premultiplies B by A and places the resultant

AB in the B array making efficient use of storage.

d) TRIPR~ - Matrix Triple Product, premultiplies B

by A and then post multiplies AB by the transpose

72

of A to form ABAt. The resulting array is then

returned to the B array storage location whi.ch again

e)

makes efficient use of storage.

S~LVE - This subroutine is a "simultaneous

equation solver". S¢LVE uses a Jordan Elimination

and pivots on the largest element in the coefficient

matrix8 , thereby, reducing the roundoff error to a

minimum and preserving the accuracy of the solution.

As was mentioned previously in (5.1) this subroutine

package enables MAGS to be quite flexible as a space

frame solver. For example, if a space frame is composed

of straight members instead of segmental circular members,

the STIFMA which computes the stiffnesses of the circular

members can be replaced by a new STIFMA which computes the

l •!:,

"

Page 85: Matrix computer analysis of curvilinear grid systems

73

stiffness of a straight member. In fact, as long as one

can derive the flexibility or stiffness matrix for a member,

regardless of its shape, and substitute the appropriate

STIFMA routine, MACS is capable of analyzing a system

composed of these members. In addition, there is also

the possibility that a structural system may be composed

of both straight and curved members. In this case a

stiffness subroutine could be included for each type of

member and properly labeled for ready reference.

5.5 MACS User Instructions

It is impossible for any computer program to obtain

the correct results unless the correct input data is

supplied to the program. For this reason the engineer

must be meticulous and systematic in preparing the input

data for the computer program.

The data can be divided into two main parts,

structure data and load data.

a) Structure Data - It is advisable to begin the

preparation of the structure data with a

convenient sketch of the structural system. Next,

the nodes and members can be numbered in any

arbitrary fashion, except that fixed-end foundation

attachments are labeled zero. Pinned-end foundation

attachments are labeled the same as any other node.

Page 86: Matrix computer analysis of curvilinear grid systems

The location of the system coordinate axes can

now be placed at any convenient location. The data

cards can now be listed in the order in which they

appear in the data deck as follows:

1.) 1 Card- contains the system indices NB, NN

and LL respectively in an 110 Format.

2.) 2NB/12 Cards- Node (I,l) and Node (I,2) are

placed in a 12I6 Format. All values of

(I,l) are read first followed immediately by

the values of Node (I,2).

3.) NB Cards- The next NB cards contain the

joint coordinates at each end of a member

and ALPH (I) for each of the members. The

order of the data is X(I,l), Y(I,l), Z(I,l)

X(L,2), Y(I,2), Z(I,2) and ALPH (I) written

in a 7E10.2 Format.

4.) NB Cards- The next NB cards contain the

member properties IX(I), IY(I), IZ(I),

AREA(I), R(I) and PHI(I) respectively for

each member in a 6El0.2 Format.

5.) 1 Card- This card contains E and Gin a

2El0.2 Format.

74

Page 87: Matrix computer analysis of curvilinear grid systems

b) Load Data - The preceding data cards were concerned

entirely with the structure data, next the load

data will be read.

1.) NN Cards- The last NN cards of the data deck

contain the nodal loads. There must be one

card for every non-zero node with the six

components of the load vector entered on the

card in a 6El2.4 Format. If a node is not

loaded a blank card can be used to represent

a zero load vector.

If a member is loaded between nodes the fixed end

forces and moments must be computed and then their

75

signs reversed and superimposed on the applied nodal loads

as explained in Chapter 2.

Page 88: Matrix computer analysis of curvilinear grid systems

76

5·6 Flow Diagrams and Computer Program

In the development of large, complex computer programs

the flow diagram is a necessary and valuable tool. The

flow diagram presents to the programmer, in the appropriate

order, the various operations and decisions that the com­

puter must make during the execution of the program.

The first flow diagram is a block diagram and

represents schematically the major operations performed

by the computer.

a.) Block Diagram

Solve For Generate Nodal ~-4------4 System Displmnts Stiffness

Solve For Member End Loa ds

Matrix

Write: Member End Loads

End

Write: Input Data

Generate ~--~---~Link

it~~tJ L)

Page 89: Matrix computer analysis of curvilinear grid systems

b.) Main Line Flow Diagram.

REAL : T ( 6 , 6 ) , X ( 100 , 2 ) , Y ( 100 , 2) , Z ( 100 , 2 ) , ALPH ( 100 ) R(lOO),IX(lOO),IY(lOO) IZ(lOO),AREA(lOO), H(6,6),ST(6,6),PHI(lOO~~F(6,6)AK(6,6),D(lOO), A(lOO,lOO),AI(6,6),PP(6J,P(6)

INTEGER:NODE(l00,2),NBPN(25),LINK(25,6) COMMON: X,Y,A,ALPH,H,T,R,PHI,IX,IY,IZ,AREA,E,G,ST,F

1 Generate -----'Link

1 Array 1 Link(J ,L)

Read: Load Data

Set All NBPN(J) to Zero

+

Read: Structure Data

~ 20 I+l,NB

Jl• Node(I,l)

77

Page 90: Matrix computer analysis of curvilinear grid systems

78

J2=NODE(I,2) LINK(Jl,Ll)•+I

0

..,.__..~ NBPN ( J2) ·NBPN ( J2) + 1

LINK(J2,L2)•-I L2•NBPN(J2)

continue

Write: LINK(J,L)

Page 91: Matrix computer analysis of curvilinear grid systems

Generate System Stiffness Matri

Df" 21 Mlml,6 M2-=1,6

Clear H D~ 69 A( I ,J) . ' J==l NN I Storage 1 \_ ' _ __;

---------··--..----t I•IABS(LINK(J ,L))

0

+

Compute Member( I) Flexibilit Stiffness

Call

79

Write: >---4----t F(I ,J) & STIFMA (I )1>--~

ST(I,J)

...__.,:Ill____. AK ( M1 , M2 ) = S T ( M1 , M2 )

Page 92: Matrix computer analysis of curvilinear grid systems

: Compute 1 Transfor-1 mation I Matrix

D~ 41 K•l,6

N=K+6*(J-l)

A(N,M)•AK(K,Kl)+A(N,M)

NJ•1

D~ 41 Kl•l,6

80

Page 93: Matrix computer analysis of curvilinear grid systems

JJ=J

G~ T~ 52

DO 51 K=l,6

~-----~ A(N ,M)=AK(K ,Kl )+A(N ,M)

Call TRIPR9J (H,AK,6)

Call TRIPR9J (T,AK,6)

D~ 51 Kl=l,6

81

Page 94: Matrix computer analysis of curvilinear grid systems

JJ=NODE(I,NJ)

DO 54 Kl=l,6

M=Kl+6*(JJ-l)

Call MTXl"'UL (H,ST,6)

Call TRIPR~ (T,ST,6)

DO 54 K=l,6

N=K+6*(J-l)

82

Page 95: Matrix computer analysis of curvilinear grid systems

D~ 65 K=l,6

1 Modify I IF NODE IS ~---~---f 1 Pinned-End

D¢ 72 J=l,NN

N=K+6*(J-l)

D~ 65 Kl=l,6

83

Page 96: Matrix computer analysis of curvilinear grid systems

D¢ 66 11=1,3 N=11+6*(J-1)

A(12,N)=O.

_ __,A (N, 12) =0. 1--~---t.

A(M,M)=1.0

c~ntinue

Write: System ~~~ffiess

D¢ 71 11=1,3

M=I1+6*(J-1)

84

Page 97: Matrix computer analysis of curvilinear grid systems

1 Solve For ------"~~---'1 Nodal l Displmnts

I Solve For r-----~----~ Member

End Forces

Call Solve

(A,D,KKK)

Write: Dist>lmnts D(J)

85

D¢ 81 I=l,NB

l=NODE(I,l ~--~--~T2=NODE(I,2~---4------

Call MTXMUL

(H,AK,6)

Call TRIPR9J

(T,AK,6)

AI(J,K = ST(J,K

D¢ 82 J=l,6 K=l,6

Call TRIPR¢

(T,ST,6)

Call TRIPR¢

(T,AI,6)

Call TRIPR¢

(H,ST,6)

Page 98: Matrix computer analysis of curvilinear grid systems

Df{J 84 K=1,6

J=L+6*(J2-1)

Df{J 83 K•l,6 L=1,6

D¢ 84 L=1,6

86

Page 99: Matrix computer analysis of curvilinear grid systems

P(K)=O

D~ 85 L=l,6

,---......j PP(K)=O

D¢ 87 L=l,6

J=L+6*(Jl-l)

D~ 85 K=l,6

D¢ 87 K=l,6

PP(K)=PP(K)+ST(K,L)*D(J)

Write: 1 PP(J) ,in

1---............c::......__~ System Coord.

P(K)=P(K)+T(L,K)*PP(L)

Write: 1 P(K) ,in

>--........,----"~ Member Coord.

J=L+6*(J2-l

-----tpp(K)=PP(K)+AI(K ,L) *D(J)

87

Page 100: Matrix computer analysis of curvilinear grid systems

PP(K)=PP(K)-AK(L,K)*D(J)

Write: 2 PP(K) ,in

~--...~ System Coord.

D~ 88 L=1,6

P(K)=P(K)+T(L,K)*PP(L)

END

D~ 86 K•l,6 L=1,6

J=L+6* (Jl-1)

D~ 88 K=1,6

P(K)=O

-Write: 2 P(K) ,in

t--~..., Member Coord.

G~ T~ 999

88

Page 101: Matrix computer analysis of curvilinear grid systems

c.) Subroutine MTXMUL Flow Diagram

DIMENSION A(6,6),B(6,6),¢(6)

D¢ 1 J=l,N

¢(J)=¢(J)+A(J,K)*B(K,I)

89

END

Page 102: Matrix computer analysis of curvilinear grid systems

d.) Subroutine TRIPR~ Flow Diagram

DIMENSION A(6,6),B(6,6),¢(6)

D¢ 2 K=l,N

~~ ~(J)=~(J)+A(J,K)*B(K,I)

D~ 4 J=l,N

¢(J)=O.

D¢ 3 I=l,N

D¢ 3 K=l,N

D¢ 1 I=l,N

D¢ 2 J=l,N

D¢ 1 J=l,N

B(J,I)•¢(J)

D¢ 3 J=l,N

)....--......--t ¢(J)=¢(J)+B(I ,K) * A(J ,K)

B(I,J)=¢(J) Return End

90

Page 103: Matrix computer analysis of curvilinear grid systems

e.) Subroutine MATRAN (I)

REAL T(6,6),X(100,2),Y(100,2),Z(100,2),ALPH(100), R(lOO),PHI(100),IX(100),IY(100),IZ(100), AREA(100),H(6,6),ST(6,6),F(6,6)

COMMON X,Y,Z,ALPH,H,T,R,PHI,IX,IY,IZ,AREA,E,G,ST,F

T(M,N)=O.

SX=X(I,2)-X(I,1) ..___~ SY=Y(I ,2)-Y(I ,1)

SZ=Z(I,2)-Z(I,1)

I

T(1,1)= ••• T(1,2)= •••

• • •

T(3,3)= ••• See Chpt. 3

10~-(

D~ 10 M=1,6 N=1,6

CX=SX/S s---r--t CY =SY/S

CZ=SZ/S

D¢ 12 M=4,6 N=4,6

~ T(M,N)=T(M-3,N-3)

91

-

I

Page 104: Matrix computer analysis of curvilinear grid systems

Dft' 20 JJ=l,6 KK=l,6

H(JJ,JJ)=l.O

H(5,3)=-S H(6,2)=S Return

End

H(JJ,KK)=O.

D¢ 25 JJ=l,6

92

Page 105: Matrix computer analysis of curvilinear grid systems

f.) Subroutine STIFMA (I)

REAL T(6,6),X(l00,2),Y(l00,2),Z(l00,2), ALPH(lOO),R(lOO)~PHI(100),IX(100),IY(100), IZ(lOO),AREA(100 ,H(6,6),ST(6,6)

DIMENSION F(6,6),NN(6 ,MM(6) COMMON X,Y,Z,ALPHA,H,T,R,PHI,IX,IY,IZ,AREA,E,

G,ST,F

F(M,N)=O.

F(l,l)=··· F(l,2)=···

• •

F(3,4)=··· • •

F(6,6)=••• Defined in Chpt.2

D~ 10 M•l,6 N=1,6

D~ 31 M=1,6 N=1,6

------ts'l{ M,N~,N)

·~achine loaded subroutine

93

Page 106: Matrix computer analysis of curvilinear grid systems

Write: Singular

Matrix

Call Exit

Return

End

94

Page 107: Matrix computer analysis of curvilinear grid systems

95

g.) Subroutine S¢LVE Flow Diagram

DIMENSION A(lOO,lOO) ,B(lOO) ,IR(lOO)t----....._. __ _

D¢ 10 l=l,N

D¢ 20 I=l,N

XLARG=O.

D¢ 11 I=1,N J=l,N

B(I)=B(I)/100.

IR(J)=O

D¢ 110 L=l,N

~ 10 J•1,N

PN=N sos-o.

D~ 20 J-=1,N

SO=SQRT(SOS)/PN

Page 108: Matrix computer analysis of curvilinear grid systems

96

0 +

XLARG•A(I,J)

Page 109: Matrix computer analysis of curvilinear grid systems

97

__ ___..,.._-:_l_~i_:_£ _ ___,1 - (0 • [;;J~---

I=Il J•Jl

0

IR(Jl)•Jl

0

Page 110: Matrix computer analysis of curvilinear grid systems

D¢ 68 K=l,N

D¢ 60 K=l,N

A(J,K)=A(J,K)+A(I,K) A(I,K)=A(I,K)-A(J,K) A(J,K)=A(J,K)+A(I,K)

BB=B(J) t-----=-----1 B ( J ) = B ( I )

B(I)=-BB

B(K)=B(K)-B(J)*A(K,J)/XLARG

98

Page 111: Matrix computer analysis of curvilinear grid systems

99

0

0

A(K,I)=A(K,I)-A(J,I)*A(K,J)/XLARG

continue

Page 112: Matrix computer analysis of curvilinear grid systems

D~ 90 J=1,N

D~ 110 K=l,N

DTM=l.

0

100

A(K,J)•O.

0

Page 113: Matrix computer analysis of curvilinear grid systems

DTM•DTM*A(J,J)

Write: DTM

G(lJ T(lJ 92

DTM•O.

D(lJ 24 J•1,N

B(J)•B(J)/A(J,J)

End

101

0

Page 114: Matrix computer analysis of curvilinear grid systems

Table 5.1 Table of Symbols

Program Symbol

Main Program

NN

NB

LL

NLC

NODE

X,Y,Z

ALPH

IX, IY, IZ

AREA

R

PHI

E

Problem Symbol

A

R

E

Definition

Number of nodes

Number of members

Maximum number of members per node

Number of the loading condition

Name for node numbers

Geometric Coordinates

Rotation of members about member x-axis

Principle moments of inertia

Cross-Sectional Area of member

Radius of curvature of member

one-half central angle of member

Modulus of elasticity

102

Page 115: Matrix computer analysis of curvilinear grid systems

Table of Symbols (continued)

Program Sym.bol

Main Program

G

KKK

D

p

pp

NPPN

Jl

J2

Ll

LINX

Problem Symbol

G

,P

p

P'

Definition

Shear modulus

Dimension of system matrix

103

Used both as a label for nodal displacements and applied nodal loads

Member and forces and moments in member coordinates

Member end forces and moments in system coordinates

Counter used to count number of members attached to a node

Node number at end-1 of a member

Node number at end-2 of a member

The 1111 member attached to node

Name of member to node reference

Page 116: Matrix computer analysis of curvilinear grid systems

Table of Symbols (continued)

Program Symbol

Main Program

A

ST,AK

F

T

H

NJ

PP

p

!:l_TXMUL

A

B

Problem Symbol

K"

F

T

H

104

Definition

System stiffness matrix

Member stiffness matrix in member coordinates

Member flexibility matrix

Transformation matrix

Equilibrium matrix

Member and reference

Member end forces in system coordinates

Member end forces in member coordinates

A general six by six matrix

A general six by six matrix

An operating vector used to store rows of AB back into the used columns of B

Page 117: Matrix computer analysis of curvilinear grid systems

Table of Symbols (continued)

Program Symbol

TRIPR¢

A

B

MATRAN

sx

SY

sz

s

ex CY

cz

Problem Symbol

T

a X

ay a z

105

Definition

A general six by six transformation matrix

A general six by six matrix

An operating vector used to store rows of ABAt back into the used columns of B

The difference in X-coordinates of the 1-end and 2-end of the member

The difference in Y-coordinates of the 1-end and 2-end of the member

The difference in z-coordinates of the 1-end and 2-end of the member

Square root of the sum of the squares of SX, SY and SZ

CX,CY,CZ are the of direction cosines

the member X-axis

Page 118: Matrix computer analysis of curvilinear grid systems

Table of Symbols (continued)

Program Symbol

c

T

H

S@LVE

A

B

IR

N

sos

so

TOL

XLARG

DTM

Problem Symbol

T

H

K"

P'

Definition

Square root of the sum of the squares of ex and cz

106

Transformation matrix

Equilibrium matrix

System stiffness matrix

Applied nodal loads

Operating vector

Size of system stiff­ness matrix which equals six times the number of nodes

Sum of the squares of the elements in the system stiffness matrix

Square root of the sum of the squares.

Tolerance

Largest eleaent in system matrix at beginning of each pivot

Deteraillant

Page 119: Matrix computer analysis of curvilinear grid systems

10?

//rJS JllR fi=)(O~CJ, 'Ff"iTON 0 I. 07/0A/67 F11~T OM~ flOitfl 00011 l"i?V;-

r. r r

t:\ r AI.. T I b, 6 t , X f 10 0• ? I , Y f 1 nn, 7 t, 7 f 100,? I , A LP4 I 1 Ol'll , P ( 11111} , PI-H f 1 ~ 01 , *TV f 1 '11) l, P f 11)0 l, f\P I= 1\ f 1 fHH, "if 6, '>I, ~T( 6, I, 1 , T X I 1'1 n I , F f,<,, 1, l

P.I=Al 1\1<(6,~<.),0(}1')01,1\( 101),)00) 1 1\lf~,IJI,PP(hl ,P(~l J~TFr.F~ N~Of(lOO,?I,NPPNf?~),lJN~f?~,6)

r,~~Mn~ X,V,7,~LOH,H,T,P,PHJ 9 1X,JV,t~,4AFA,F,r.,~T,F ~qQa RFA0(1 1 1001N~,NN,LL,Nif

1 00 Ci1RIIol .aT ( 5 J1 0 J WQTTF(~,201)NN,Nq,Nlr,LL

~I'll F'l!H"'ATf' 1 NUMPFR 11F Nnnp.;tf3/' "'IIM~E~ (IF "4FMq!=llS'nt• IIIIJI.IRFA 111= *VHOTNG CONDITTn!'·l' T~/' MA)(fMlJM NIIMRFP rn:: MP4RFPC:: PFR '-!110F' J'H PFAO(l,?01)1fNnnF(J,tJ,J:1,NR),(~OnE(J,?),J:l,~R)

nr, 3 T-=1 1 111~

~ pr:~OC1,77711XII,Jl,Vfl,J),7ft,JJ,J=t,?),4lD4fTI

nn 4 T=l ,NB lt AFAn(t,771Jfl((J),!Vfll,tHIJ,ARF&(n,PITI,PHf!TI

ll r-An ( I 1 1771 F , r. 771 FflR~ATC1FlO.?J

It' 1<,1(: ~·~~~~~ P"" A 0 I 1 , 7. 4 l l f n ( I I( I( l , J K I<= 1 , I< Kl< 1

'41 Cf1QMAT(6Fl7.41 '-/1"1 JTr( 1, ?0?,

'0' Cf1PMAT(//4~)(t MFMRFP r~nPI)JNAMT~t/"i~'14EMqfP-ft~X 1 1Il,li 1 ~X'XIt,?l'

*QI'Vft,ll'~''VIJ,7t•qx•zrr,tl•~x·~rt,~l''' ,0~ F~q~~TfJ10 1 7Ft~.~~

'1'1 .,"4 T=1 1 Nq ., "'• 1<4D T T ~" ( 1, 7 0 ~ l I 1 X ( f , I I , 'I( ( t , ? l , V ( l , l ) , V f I , ? l , 7 ( I t 11 , "! ( T t 7 l

W? TTl=( 1, ~O'i I ?0~ F,PM~T(t 1'~4X•MF~P~~ ~pnoF~TtF~'/ "iX'I4FMA~q-ftR)( 1 lY'1~1 1 lV'1'X' 1 7 1

* 11 't' 1\. R ~A t l ('I ')t • A 1\1"1 J II<; • 1 7 Y 'PH T t 11 lC' U PIH 1 II f)~ ?M-, T=l.,MA

.,nf, t.l" TT F I 1 1 7fP I I 1 T 't ( l I, IV Ill 1 rl IT l, ~1H" lIt I , PIt l • PHT I 1 I • 1\1 PH f J I 1.1QIT~"f1,7071

.,07 l='lDM~T{' l'4~'W'JIPOI tFn "!r'II)Al lf1"1)~'/6!fHJr'lnFI1'lC'PY')"li'(IPV'11X'P"f'l1Y *''-1Y 1 1 "liXt ~yt 11)( 111117' /l

')n ? ~ q T = 1 1 ~I "J ~<~~•r

'"R ~~TTr(1,~1'11Jf,l)(~-'il,niK-4t,ntK-~t,O(K-?l,l)fK-1),~1~l .,Q U~"l 1, 10"1 W'l TTFI 1 1 o;not f)'l q ,J = 1 ' ~~, 'V'I P l=l ,Ll

q l PJI( f .I, 1 I ... o 0'1 q .. 1=1 ,NN

q Nqo~IIJl=f'l

!)'1 tn f=J,NP lO WI"'JTC(~,601'JI,'II10Fff,1),"1nnffTt?l c::Q<: P.l A

THF Fflll '1W tNr. 1 I. STATF"4FNTCi f)f:TFP14f~F WH!~4 <AFM\, T . ~T"I 1 ~"TIIP 4l NFTWfiOI( APF tNr: YnFNT l'l~ A r;TVFIIJ ~n E. Till I ' "Jfli)Ffl',lt•JJ AIIJn ~!f11)ffT 1 ?J:J7 1 Wto41:PF .f! A!'.ln .P' ~PFvTH!= -,nnF<; H THF NF.AP A'-10 FAR ntn~ f1F THF= MfloiAFR Pf~D!=I"TlVFl • 1)'1 ?1'\ h:l,"'A 11 =•~nnF ( J 1 l1 fl=(.llll"·''·''

Page 120: Matrix computer analysis of curvilinear grid systems

r

I I 'I li'H•I II I -•tll:"l( I 1 l•l I I '""''"'"'I J I I I ' "" I J 1 , I 1 I - !

I ., P - "''" r I I , ., I

'" 1.1 '' :11'\' '"·,, 1' 'J~ 0 •11Pl-= ... Pn"<(J'I+l

I ' ~ •'"" "'I I ., I 1. 1 ••v 1 ,., , 1 ., 1- _ 1

.,, '"""TI'IIJ~

1'1

'')' "'" <;('l'l

<,I'll)

7, '1

011'1

,, 'l

wo T T r 1 '\, "\ 1" 1 W., f T r I '\ 1 1 'l" I W0 !Tri'\,Q'1"l

'Yl ,,.. .J-1,'''' "i" ! T r I "\, '"I 11 '1 I 1 , ""' n" I l 1 , II ntl( I .I, I I , I = 1 , 4 I r -,p"' ~ T I I ., I~ 1 r"'1PUI\T(1~11

• 'lQ"' ~ T ( c; Y 1 ' •• ~ ., '1 • , ., v , 1 '' q" r I l 1 I I 1 , ., V: 1 1 •J '1 "''I= I T 1 ? I 1 I I I r '""'' 11 T ( <, v 1 T 1 , •· y , 1 1 1 n v , 1 l 1 r )I')UI\Tf<;Y 0 1'•...,"1 I, "~V 0 ll"'0'JI 1 1t,Y 1 11_ f~I(IJ

r "I'IU 1\ T I .. ., '(. ' 1 I 'r v • ' ., ' ' ,. 'II • ' '. 'c; 'll' I 4 I c; y I c; I c; '(.I, • Ill r 10 u ~ T 1 c; v, T 1 , , y, t 1 , '· y, 1 '\, l 1,.. 1 ,., rAn c:,vc.rru rryrc'J' c:.r 1 'II C:Tn?I\';F L"r~TJfl'l,fC:.

')'1 ~, ·'"'•""" "'1'1 ,_-. I : 1 , •· 1t v

I,., 1\ I 'I ' I 1 , 'l •

108

: ••••"r••ro~Tr cvrrr" rTirr.,rc;r 'oi~T.,fll'$**•

r

r

,. ,.. r

"' ,._ ... 1-::, ••••• " 1 '- I I = 1 , I I

T-=f~OCfl '""I'·' 11 1"1 1 1'-"•'q,._n 1"'1liPqTC" ,.C:.,'lrOIJI C:,Ttrr-•trc:c:, Vl\f?JV:

1-,Q ~"1\fl <:fJr"\ITI W0 T T r I '\, ., 'ln 1 r

'1"1 r'lnw-.TI'1'l"Y'''r•onrntt~/IC,'W'FII''(fOJI !TV 111'\TOTl(fi/J

"'C,

.,1,

'• ,, ')

'1

.,11

1"

'1'1 n I, '-'1 1 - 1 I I,

'-4" I T r I , , 4 '• '' I I r I " 1 , " I , •' = I , '- 1 W., IT r I ~, ? 1 11 I '"'1 Pll ~ T 1 1 1 c;,.. v o < T T l r· '' r <:. <:. u ~ T n I Y t I I I '~" T T r I '\ , t, 4 '1 I ! I <: l I v I , v ., I , I( ': 1 , f- I , K 1 = 1 ' '> I r '1 D._. 1\ T I " r 1~' • Q I ')l .,1 "1=-lo'' "'"' ;> 1 ... ? " 1 • ~ 'l•t I~ 1 1 '4? I= C: T I" I , ""I ,...,,.DtJTf 111r111nJ:CI 1 T 1 I\ 'I' f<: POTI\Tft"!'l TO.\'IJC:I=rtPI.4ATTf'1"J '-'~TP!)(' !"' .. ll ~1\TP't~lrt lol" f T '" I '\, ? 1 1 I l''liH• .. T(//'irtYtTD~.,<"f''lt'U~Tf!'I•J 1.41\TOfXIf/1

rJn 1 r; '-'= 1 , ,.. 114" T T ~' f '\, 4 4rt I I T I~, 't I , ''=I , ~ 1 wqyrq I"'"Jn nr .. r .. nrn 111 T c; 1\T ·~n"''> I II f r I I T •J K I J ,I 1 1 4 n, '•" , c. 1'1 ? 1 $T t

',.. r T" •T "J'l110f,ll r"rt\ll'liiT~'t K'l',?!-= T*lll?, - -"Jf\-? nr ... r .. nr"!f1 'n ' nu

1\ ooPnPp!~TC ~YA 1'1f~T[f'1~ ~ f'1T 1Hr"T c;ryrr>Jr<:;<:: II''" ~1'1'1<"; TT T'1 Tl-4> T ~~ r c; v c:, T r '-' "' 1\ T " T 'It •)! 1\ r:r' ''~I •

Page 121: Matrix computer analysis of curvilinear grid systems

40 C~Ll TRTPROIT,AK,~I N.l= 1 nn 4 1 K = 1 , f. "J=K+M(J-ll 1')'1 4 1 K 1 = l, 1'­"'=Kl+fi*(J-11

41 ~(N,•·n=AK(K,I<l I+A!f\l,M) r;l") rn 52

r JF F"JO-l flF l't'!F~RFR(ll 1<; 1\T NnnFtJI rt1"lPIJTI= K'f1,11=Hti<H'T 1 1\~0

r /\!')~<; TT Tn THF APPOf'IPRT~TF 6X6 LflCI\Tlf'JN flN THF ~VSTF"' "'1\T~JX

r nTI\f,nN•L. 'i() CUI TPJPQf'lfY,AK,f>l

C~Ll TRtPRO(T,AK,~I

"'J=? JJ=J nn " 1 K = 1 , '­"J=K+M•tJ-ll 1)'1 "i 1 K 1 = l, f.. ~=KI+f-*LJJ-1 I

"i1 A(N,M)=I\1<{!<,1< li+Af'.l.Ml

109

,. TYF rnttOWJNr; 1~ STATrMFf\lTS tnraTE THE [~n nF ~F"'PFPf!l N!')T T~lr:Tf)FNT nN Nfln( !.1) ANn rnMPIJTt= THF 1\PPPOPT ATF flFF nrar;rll'lfll fl'fft

<;Tfft=NFSS MI\TPTX.

r

o:;., T r: Otnn E( J, N J I ) "i 1 , " 1 , c;, "i1 JJ:NnnFtT,I\IJ)

C~U MTXMUL{H,•::;J,<,)

C~ll TPJPqn(T,<;T,f-1 ~'l rnt64,f.1),"1J ('J"'PI.ITF -THif T'

., , n, c:; '• ¥ = 1 ' "' "'-=K+<,* I J-11 1''1'1 '>4 Kl=l 1 A "'=Kl +f>*( JJ-11

"i4 ~~~rMl=-ST(K,Kll r.f') Tn At i.'1MP1fTF -TKH' T •

!, 4 f)f1 "- "i K = 1 , 1'­

"l=KH-•(J-ll

nn "'" Kl=l 1 A M: tq +A* ( J J-1 )

<,<; ~IN,M)=-ST{Kl 1 K) "1 rrwr J"-IIJF <,() rll!\!Tlr-Jilf

!)'1 .,, J.,l,~l~l

T'=(l T"JK(J,?)l7'>,1'.7,"7? <, 7 f"l'l " " T l = t , ~

1\bfl+A*f.l-11 IY1 Af, T?=l,KK!C'

1rt ar '"•"'~="· "., ~ I ~J, r ;J t = n •

f)f1 71 y ' :: l ' ~ ~= T 1+1'.*1 J-11

71 ~ra.,,~l=l.1 7 ') r '1"--T l "ltJF

Page 122: Matrix computer analysis of curvilinear grid systems

W" TTf:( 1 9 71? l ?D J:'lPMq(') 1 "H'I. 1 SVST~~ STlFHJFSS "'UPTlfl/11

!)'1 ?11 f=I,KI<Il ?11 W'~JTff1,?14lJ,(t.(T,Jl,,J=l,KKK) '14 r-nRM~Tf/' o~w·r~/fnf:17.7JI

r ** c::nLVF FnP ~''lfll\1 nTC::DL~f.F"!FNTS ** r: "u c:; nt v F 1 a, n •"' K 1< 1 I~" TTF( 3 1 ?lf:>l

110

'1fl CflPM~T(40X•~tnnAL nT<:;r>t_Af:f:MfMTS'/16'1.'~H10F'7Y•nrt.H-X•qx•I"'FI r~-v•av *'"rt TJ\-]Iq)(tTH!=T~-'itPIJITHFrtl-Y'I\)(IT!-~FTh-7'/1

'1" ?17 T=l,IIJ~I

J::A*T

'P \.J? TTf{ 1, ?I)~} T, nt J-<;J ,nr J-41 ,01 J-11 ,!"lf.J-'1 1 1"11 J-t l ,1"11 II r TY!= OC!Ioll\ ["4f)FR fll: Tl~l"" nonr;P'IM Cl"lMPIJTF<; THF "''f"''l1FP P.,H) P!=~f"Tf'1N<;

r 10 TOST TN SY<:;TF.,. f:n'"IPOf"'l~TFC:: ~"111 THPI TPh"JSFilPM<:; HIF\1 Fl !Oir~otaf"P r rl'l!)f~~rrc;.

W')JTrf1,?1f1) '11\ CflPM~Tf•11~7XI~r:~qr:p F~n Fnorrc; ~"'n ~~Mf"JTSI//14V'PP,Il'Y'""V'1'v

* '0, 7 I 1 .., X ' ~p 'I( ' 1 ? )( I ... 0 vI 1 ? l( 'M 07 ' I ' 14PII P. r "~"' I, rw' 0 )( ' 11 y 'PV I 1 "H' 'n 1 '

* 1 1 'I'M'(' 11)(' MV I 1 ,_ l( I M7 'I" "'"~ P 1 T = 1 , 1\1 P

J1-=~,ln<W( J 1 11 .J'=~'"'lF ( J'? J '""II C::TfF"'IIIfl r"t'l D? J:) 1 f. 1"1'1 a? K = l 1 f-,

hl<f.J,'<l=STfJ,K I "' 'IT(.l, 11 1=STIJ 1 Kl

r\1.1 ... HP<\N!Tl '"~ll TRJnonr~,c::T,~I

~" 1\11 TR[Piln!T,C::T,t-1 r'lll MT)(MlJI (11 9 1\K,f.l 1.~11 ToJDQn(T,~K,!,I

r~tt TorponrT,-\T,t-1 "l'l A4 1(:: 1 t I.

""fl<l=O. 11'1 P4 L=J,I, 1=1 .,. ( J 7-1 l

Pit 011(1( I=PP('<)-111<' (It·'- )~11( II T"' I J 1 I 7f,, 7n, 77

77 "1 "" 1<=1,1'-1''\l'l p"ll, l=l,~'-

J =I +"*I J l -1 l 0 '\ 00 11< 1-::Ppfi(J+<;Tfl<' ,l 1*11( Jl 7,_, 1-1'> lTFf 1, 11".1('1 (PDf .II 9 .1=1.!,)

1qt'l c:lPM~TflOX?Hl' ,lt•l(!,l=l'i.!,/l ~.,orvc; IT ~~n-1 nv ... ru~rorfl ')"l A<; I(:),~

"f"l=n. r"\'1 fl <; l = , ' ,.,

"" 0 (K):Pflt' I+T(I ,t<Jllri'O(II \./'> T T I= I 1 , 1 ~ 7 I I P { J I , J = J , f. 1 ' T

I ~ 7 c 'l P ~ 1\ T r 1 n x • 1 • ,., r 1 c;. 61 T" 1 '')r"l 07 1(:::1,,.,

Page 123: Matrix computer analysis of curvilinear grid systems

PO(KI=O. '1'1 P 7 l = 1 , A

J=l+">* LP-ll q7 PO(II')=PP{l()+!l.l (K,f l*l"lfJ)

ft=(Jll7R, 7R, 7!')

7fl r"l'l P"> K=l,A f111 P A L = 1 , A l=l+A*( J 1-11

ill, !>O(I<):PP(t()-11.!<'(1 ,KI*f'(J) 7 A W" T T I= ( 3, 1 <l 0 l I P 0 f .J I , .J = 1 , A I

lQfl ~'-"'1P~I\T(l0X?H?• ,14Y61=1"i.6!) r: F'l!H'TS AT Ff'M)-? f1F ~F~~H'P(Tl t•~ "'fM~FQ r:nnROTN<\TFS.

1)"1 P<l 1(:] 'I,

O(V):-1) 0

1'\flPilf=J,f... oq D(K)=Il(Kl+TfL,K)*IlO(f '11 Wt>.JT!=('\,lqPl(pfJI,J=l,f...)

lqll F'lR~II.T!lOX'''~~'=l"i.6//l r.r1 Til oooo C::'\10

t:;IJPPI'ltfTTNE MTX~lllf o\,A,N) ") ' ~f N S l n ~~ A ! f... , f... I , A I A , f, 1 , n! A I '1n ? T = 1 ,11.1 '1 11 I J=l,"l '11.11="· '1'1 1 K-= 1 , N nt J }.,'1 f J I +1\ I J, K l *o, (V, f l n'l ? J = 1 , N

., "IJ,fl=nt.Jl Rf:TltP~l

r: \!f)

c:; !J n IUl 1 JT 1 "'r:~ T n T n p n f h , P , ~I}

'"'l P~F '1.' S T n "' ,o. ! A, 1,) , n ! A , f... l , n I A l l')'l 1 T = 1 , N ....,, ? .I= l ' '\l "'1.11=0. f)r) , I(= 1 • "'

., "I .I I =fl LJ 1 +~ f J, I< I*" I K, Tl 1'):1 I J =I , 'IJ '11 J, T l=fl( Jl 1')'1 ., T = l , "l n'l t,. J = 1 , N '1(.11=0. '1'1 4 K=l,N

4 'lfJI~n!J)+P(J,'<l*l\fJ,K) ')'1 ":\ J-=l,"J

., q f T, .I I= n ( I I RI=TJJP!IJ n1n

111

S' I'" o l'ltJ T 1 1\l F ~-' .1\ T P A~~~ T l R f l n n 1 P~ 1 I )!HII • , c /1 I T I h ' 1-, I ' X I l n" ' ., l ' y I 1 n n ' ;> I ' 7 I l n f1 • ? I ' " L r>H f 1 n 0: '" f ~-, F, I •

*TY!101)),I7f10f') 11,QI"~f111fll,l-lfl,,l,),c:;TI.;,f)),T'((ll)f'l 'r ' ,.. ' f7 ~PI"a t: r': <;T,.-

-,.,MI'l'I.J 'IC,Y,7,~1_P~,~,T,Q 9 PJ-lT,TY,TV, ·' Qt ~T~ ponr,q~"' rr"'PIITI'<: IJSTW: TI-ll= rnnPf"lPII\T!=C:, 1\T r:l\,(t-1 '11" II Ml=~l'IF T

Page 124: Matrix computer analysis of curvilinear grid systems

r THF THRFF OfMFN~Tn~AL POTaTION TQAN~FnR~~TfnN ~aTRI~ WHJfH [ TqAN~FOPM~ FLFMFNT rnnPOJNaTES Tn ~VSTE~ cnnRniMATFS.

nn 1 n M= 1, 6 !)fl l n N= 1, A

10 TfM,t.Jl=O.O <;)(':)(fl,2l-Yf J,ll <;V::V(I,;>)-Y( I,l)

<\7=11 T,?l-7( T, ll C:..=~ORT(S~**'+<;Y**'+c;7**'l rX=S)(IS rY=SYIS r,7:S7/C:.. r.:c;Q9T(fY**'+f7**?) T{),l)=('(

Tf 1 , ., l = (-cur v *r n s f "L PH ( r l 1-r 7t~ P.H -'1 1 PH 1 n l ) tr T f 1 , ~) = ( f X* ( V* S l N I I\ I PH f f ) ) -( 7 *(()<;( 1\ lPH ( f ) II If Tf?,ll=fY T(?,'>l=C*f:f"l"f!\LPH( T) l T(?,~)=-f*SP.Jfl\l PHfTll T(~ 9 ll=f7 T ( 1, ? ) = ( - r: Y* r 7 "'r '1 c:: { 1\ L P 4 ( T ) ) +( Y *q 1'.1 ( ht PH f I ) I ) /( Tf~,~l=ICY*f?*SINfi\LPH(l)l+fX*rOS(ALPHCTllllr 1"'1'1 1? M= 4, o f)'l , ? "-1=4,,.,

1' TIM,t.JI=T(~-~,N-~) f"l'"' ?n JJ=l,A f"l"' ?() KK=1,f.

"!l H{JJ,KII'l='l.~'"'

!i'l '" JJ=1,6 ?'5 HIJJ,JJI=l.n

H(",-,.1=-~

IH "·,) =S t>CTIIQ~J

F"J~

112

SlloPniJT pJc: STl p.PI( Tl Q r: 1\ l T ( 6, 6) , )( ( 1 n n, ? I , y ( 1 1)0,?) , 7 ( 1 ()I),') l , A I PH ( 1 ()()I, PI l !'If) I , ll4l ( 1 '1 ()I •

* T Y ( 1 n !i l , T 7 ( 1 10 ) , 1\ P r 1\ ( 1 '1 n l , H ( f. , 6 l , c:: T ( ~ , A I , T )( ( 1 "'1 I n T M ~=" "' c:: T n N r 1 r-, , r, l , •p.J( f 1 , M ~ 1 ,.., ) r. 'lM M Or>.J X , Y, l • fll ~PH, ~~, T , P , PH T , l 'If , T V, T 7 , ~ P f h t F '~ • S T • F

'1'1 tn "1=1,,..,

'"'l'l '" "·'=l·" 10 rpo~,N}:().I')

Cll,ll~CP(JllfiDF~{ Tllfl*IPHJfTI+.~*ST~(?.•PHTITlll ~ ! 1 • l l = F ( l , 1 1 + ( P ( l ) * * ':\ IF I T 7 ( I ) l * I PH l ( T 1-1 • r:; * <; T "J ( ? • *PH f I T I 1 1 F I 1 ' 1 l = F ( 1 , 1 l+ I P f T 1 * * ~ I 1= 1 T 7 f T l l * ( ? • * P4 I I I I * f U'l S I PH J f J 1 I 1 **? 1 r I ? ' '1 = ( Q ( T ) II\ P F .-. ( T l IF ) * ( PH l f f ) -. 'i * <; l "' ( ? • * Pl-4 T I J ) l l F I :"' • :"" 1 = F I ? , ? l + ( P ( T I * * '1 IF I T 7 { l 1 I * ( PY T ( T l- • r:; * q "' (? • *PI-IT I T I !! , 1 F ' ., ' ., 1 -= F ( ., ' :> ' + r o r ' ' • * ~ I c ' T 7 I J l I * I ? • * o ~~ I I I l • I c; I "' ( o H ' ' ' l 1 I F I ~, 1 l = ( P ( r l * * ~ I ~ I r x r ' ' 1 * I ~. • o 4 ' r T ,_., • *" ' N I ' • • Pl-l r ' T , , 1 F I ~ ' ~ 1-= F ( ~' ~ ) + I P I l I * * 1 I r; I J 'If I l l l * ( • 'c; * <; J "' I 4 • * o H T ( T l I I I c: I 1 • 1 l = r ( 1, 1 I+ ( P I T I** -:t I r It v ( J 1 l * I PH T I I I- • ?"i *q "'I 4 • *PH I ( J l l F I 4 t 4 1 = ( R ( T l I r; I T 'I( f T l l * ! fl4 J ( T 1 + • r:; * <; T "l ( ? • *PH f I l 1 I l r. 1 4 • '• 1 = F 1 4, 4 1 + r r> 1 t 1 1 r 1 r v 1 r , 1 * 1 °H T 1 r 1-. "* c: r N r '· •PH I 1 ' 1 1 1

F ( c; • c; 1 = I 0 ( T 1 I r. IT X ( T l I * I PH T ( l 1- • '5 * S f t.J I '• *PH l I T I 1 I

Page 125: Matrix computer analysis of curvilinear grid systems

F I 5, 5 l = F ( 'i, 5 l + I P f l I l f IT Y f I )l * f PH I f I l +. r; t S HH ? • *PH J (I J J J F ( 1:>, A l = ( R ( I l IF IT 7 f I I l *?. *PH t f I l r- ( 1, ? l = ( R ( I ltr:* V F I ll ( I l l * ( ? • * ( SIN I PH T f J) 1 J ** 21 C( 1 , ? 1 = F I 1, ? l+ f P I l l **~IF If 7 I T 1 1 * (-PH T I Tl *S J N (?. tPH I f Tl J J l=f?,l l=Ffl,?l

113

r- I 1 , 6 l = I R ( I 1 * * ? I F I T7 ( T J 1 *I ? • * <;t N I PH Y ( I ) l-7. *PH T I J 1 tC nc; f PH I fT ) I I Fl6tl t=F( l,f-1 F I ? , 6 l = ( P ( l ) * * ? IF I f l ( l l ) *I ? • tP H t ( I 1 * c; I N I PH I f T J l l F(6,J)=F(2,6l F ( ~, 4 l = ( R ( T I ** 21 r:. I TX ( I I l *I Pl-q I l) *C n c:;( PH I fT J l -? • * c; TN ( PH I f T I J l FI, 9 4J=F(3,4)+(PITl**?/~/IXITilt(.5tC~SIPHTfJJJ*SINf2*~HiftllJ F ( ~, 4 J = F ( 1, 4 J + ( P ( T J * *? /F 1J V f l J I* ( PHT I T 1 *COS (PH J I I ) Jl I= I 1, 4)-= F ( 1, 4 J + ( P ( T 1 **?/I' /J V( I 1 1 * (-. t; *COS (PH I ( I J l tq !If P. *PH J f T I J I C(4,~l=F(1,4l

~=" ( ":!., "i l =I -Q. ( I l ** '?fr, I T X f J I l * f PH T ( T J * q N f PH II T 1 1-. 5 •<: PH PH T fT l J **<:TNP.*PHT ( T1ll

!= ( 1, c; l = F I 1, 'i l +r- R ( l I**.., IF IT VI I ) l * ( PH T f rt *S T ~I PH I I J l l I F ( "', c; l = F ( 1, 5 I+ ( -P ( T l ** U FIT V ( l l) * ( • c; tS J N ( PI·H I T ) )tc; P-4 P. *PH J IT l l I Ffr;t31=FI1,51 11"1 11 M: 1 t A

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snc;:n. 1)11 ? n J = 1 ' N l'l(J):f)

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l")f1 1 l 0 l = 1 ' "' '<1.. AP (;:I) •

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T l "' J

Page 126: Matrix computer analysis of curvilinear grid systems

J1 ooJ lJ (ClNTJ"'IIF

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114

Page 127: Matrix computer analysis of curvilinear grid systems

115

Chapter 6

CONCLUSIONS AND FUTURE INVESTIGATIONS

6.1 Conclusions

A method of analysis for space frameworks composed

of segmental circular members has been developed in this

paper along with the computer program to perform all the

computations required by the analysis. This analysis

is fundamental to a number of noteworthy investigations

that could be made in the future, which are discussed

in (6. 2).

An analysis of this nature would be highly

impractical without the aid of the computer, however,

with the computer, the analysis of structures such as

those described in this paper can be analyzed in a

relatively short time. Since analysis described in this

paper reflects more closely the true behavior of the

structure, a more efficient and economical design of

the "curvilinear space grid" should be expected.

An experimental model was built and tested in order

that the theoretical solution could be correlated to the

observed and measured physical results.

B encountered in measuring ecause of the difficulty

the true vertical displacement of the node points, the

correlation between the computed vertical nodal displace-

ment and the measured vertical nodal displacement is

Page 128: Matrix computer analysis of curvilinear grid systems

116

rather poor, however, the measured stress at a given

point in a member correlates very closely with the stress

in that member calculated from the member-end loads

computed by the theoretical analysis. It can be concluded

from these results that the theoretical analysis does

compute the member end loads properly and if the nodal

displacements had been measured more accurately the

correlation between them would have been much closer.

The analysis of curved structures other than circular,

could be made by approximating the curves with circular

segments, which would increase the number of node points.

This procedure, however, is suggested only in the case

where the derivation of the actual flexibility is not

feasible, since the addition of nodal points increases the

number of equilibrium equations which must be solved and

reduces the efficiency of analysis.

6.2 Topics for Further Investigation

a.) Temperature Affect- The affect of temperature on

the structure can be included in the analysis with

little difficulty. If the change in temperature

is equal to 11 t", the change in length of 8 member

from its unstressed length and consequently the

change in internal stress can be computed if the . for the material

coefficient of thermal expans1on

is known. The internal forces resulting from this

Page 129: Matrix computer analysis of curvilinear grid systems

117

change in length can then be included in the member

load-displacement equations in general as,

(6-1)

where ptl and pt2 are the member end-loads resulting

from the thermal expansion when the end-displacements

are prevented.

The load-displacement equations for the structure

can be assembled as was explained in Chapter 2 if

equations (6-l) are first transformed into system

coordinates as follows,

' - K' 6 I K' 6' p' pl - 11 l + 12 2 + tl'

and

It is often desired to study the affects of

temperature independent of any externally applied

loads. This can be done in a straightforward manner

from the following equation;

0 = }. I 6 I + Pt. (6-2)

The results of equation (6-2) can then be super­

imposed on the normal solution.

Page 130: Matrix computer analysis of curvilinear grid systems

118

b.) Foundation Movements -The effects of foundation

movements on the curvilinear space grid can easily

be taken into account in the analysis by modifying

the appropriate displacements in the load-displace­

ment equations.

c.) Optimum Design- It would also be interesting to see

an optimum design study made for the lattice dome.

Since the method of analysis described in this paper

neglects only the shear energy in the general energy

derivation, more efficient use is being made of the

structural framework and the engineer is able to

preduct its behavior more accurately. It is there­

fore possible to study the effect of the grid

spacing on the size of the material and arrive at a

more efficient, economical design for the lattice

d.)

dome.

the curvilinear space grid can now be studied.

generation of the system stiffness matrix is as

fundamental a step to the formulation of the equations

of motion for the dynamic system as it was to the

formulation of the equilibrium equations for the

static system. The loading vector is a function of

time and the mass of the structure can be treated

and rotational inertias as a series of lumped masses

Page 131: Matrix computer analysis of curvilinear grid systems

concentrated at the node points. The problem can

finally be reduced to the general eligenvalue

problem.

119

e.) Computational Problems -A discussion of the com­

putational problems involved in analysis of this

type are discussed in reference (3). There is,

however, additional work needed in developing methods

by which very large structural systems can be

handled effectively such as by the substructure

method, where the larger systems are divided into

smaller units which can be handled more efficiently. 3

Page 132: Matrix computer analysis of curvilinear grid systems

Bibliography

1.) Eisem~nn, K., Woo, L., and Namyet, s., (1962) Space Frame Analysis By Matrices and

Computers", Journal of the Structural Division, ASCE, Vol. 88, No. ST6. December, 1962, pp. 245-268

2.) Gere, J. M., and Weaver, W. Jr. (1965) Analysis of Framed Structures. D. Van Nostrand, Inc., Princeton, N.J.

3.) Livesly, R. K. (1964) Matrix Methods of Structural Analysis. Pergamon Press Ltd. London. pp. 1-111.

4.) Hutton, C. R. , (1961) "Curvilinear Grid Frames", Engineering Journal, July, 1964, Vol. 1, No. 3, AISC.

5.) Celis, A. J., Unpublished material being prepared for text book.

6.) Fenves, s. J. (1967) Computer Methods in Civil Engineering. Prentice-Hall, N. J. PP• 76-83.

120

7 •) Baron, F. , (1961) "Matrix Analysis of Structures Curved in Space". Journal of the Structural Division, ASCE, Vol. 8?, No. ST3, March, 1961,

8.)

9.)

10.)

Fox,

Li,

pp. 17-38.

L. , (1965) An Introduction to Numerical Linear Algebra, Oxford University Press, N. Y. pp. 60-93.

Shu-t' ien, ( 1962) "Metallic Dome-Structure Systems", Journal of the Structural Division, ASCE, Vol. 88, No. ST6. December, 1962, pp. 201-226.

Michalos J (1966) "The Structural Analysis of Spa~e N~tworks"' Int. Conf • on Space Structures' Univ. of Surrey. September, 1966.

Page 133: Matrix computer analysis of curvilinear grid systems

121

VITA

The author, David L. Fenton, was born on March 20,

1941 in Murphysboro, Illinois. He received his primary

and secondary education in the Dupo, Illinois Public School

System graduating from high school in May, 1959.

He entered the University of Missouri at Rolla in

September, 1959 and graduated in May, 1963 with a B.S.

Degree in Civil Engineering. While employed as a stress

analyst for McDonnell Aircraft Corporation he began

graduate study at St. Louis University night school in

September, 1963 and continued until February, 1964.

In September 1964 he entered the graduate school of

the University of Missouri at Rolla. He received an M.S.

Degree in Civil Engineering in January, 1966 and continued

work towards the Doctor of Philosophy Degree in Civil

Engineering. He has held a National Science Foundation

Engineering Traineeship during the period from September,

1964 to August, 1967.

He is married to the former Janice A. Biel1er and

they have two children, David Scott and Susan Lynn.

Page 134: Matrix computer analysis of curvilinear grid systems

APPENDIX A

COMPUTER SOLUTIONS FOR THE MATHEMATICAL MODEL

Page 135: Matrix computer analysis of curvilinear grid systems

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Page 169: Matrix computer analysis of curvilinear grid systems

APPENDIX B

COMPUTER SOLUTIONS FOR THE EXPERIMENTAL MODEL

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