mim 271e theory of structures week 2erolgu/page3_ypst/mim271e week 2-gerol.pdfloads to be supported...
TRANSCRIPT
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MIM 271E THEORY OF STRUCTURES
WEEK 2
Dr. Gülseren Erol
http://web.itu.edu.tr/~erolgu/
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Principles of Structural Analysis
The main topic of MIM 271E Theory of Sturctures is the structural analysis of two-dimensional lineer statically determinate and indeterminate structures.
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Structural Forms
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cables
frames
Structural Forms
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trusses
arches Structural Forms
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Structural Forms
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Classifications:
– Concentrated Load, Distributed Load
– Static Load, Dynamic Load
– Dead Load, Live Load
Dead and live loads are combined according to the selected analysis method and national code specifications. Eventually, combined load (P) is applied to the idealized model of structure for structural analysis.
Loads
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Loads to be supported by the structure should be determined.
Design loading for a structure is often specified in codes for every country.
Turkish
• Design codes
(TS498- Yapı Elemanlarının Boyutlandırılmasında Alınacak Yüklerin Hesap Değerleri - Design Loads For Buildings)
TS498 is not applicable to special structures as bridges, industrial structures etc.
• Seismic design code
(Specifications for Buildings to be Built in Seismic Zones, 2007)
Loads
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Loads
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Building and design codes for USA.
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– Dead loads (G)
• Weights of various structural members (beams, columns, shear walls, slabs...)
• Weights of any objects that are attached to the structure (plaster, floorings, levelling concrete layer...)
– Live loads (Q)
• Varies in magnitude & location (people, furnitures, vehicles, cranes, snow, wind...)
• Depends on the purpose for which the structure.
- These loadings are generally tabulated in local, state or national codes.
Loads
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TS498 - Design Loads For Buildings /Table 7. Vertical Uniform Distributed Live Load Values
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Types of live loads
– Building loads
– Snow loads
– Hydrostatic & Soil Pressure
E.g. tanks, dams, ships, bulkheads & retaining walls
– Highway Bridge loads
– Railway Bridge loads
– Impact loads
– Other natural loads
• Effect of blast
• Temperature changes
• Differential settlement of foundation
Loads
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Types of live loads
– Wind loads
The side of the building is subjected to a wind loading that creates a
uniform normal pressure on the windward side and a suction pressure
of on the leeward side.
Loads
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Earthquake loads
Earthquake produce loadings through its interaction with the ground & its response characteristics
Their magnitude depends on amount & type of ground acceleration, mass & stiffness of structure
During earthquake, the ground vibrates both horizontally & vertically
Loads
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• To develop the ability to model or idealize a structure so that the structural engineer can perform a practical force analysis of the members
Support Connections: In reality, all connections exhibit some stiffness toward joint rotations owing to friction & material behavior
Pin connection (allows some freedom for slight rotation)
Roller support (allows some freedom for slight rotation)
Fixed joint (allows no relative rotation)
Structural Idealization
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Structural Idealization
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Structural Idealization
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Structural Idealization
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Idealization of Supports
Roller support
Support reaction = 1
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Structural Idealization
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Idealization of Supports
Simple support
Support reaction = 2
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Structural Idealization
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Idealization of Supports
Fixed support
Support reaction = 3
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Structural Idealization
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Idealization of Supports
2-hinged element
Support reaction = 1
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• Consider the jib crane & trolley, we neglect the thickness of the 2 main member & will assume that the joint at B is fabricated to be rigid
• The support at A can be modeled as a fixed support
Structural Idealization
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1-way system
Tributary Loadings
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Equilibrium equations provide both the necessary and sufficient
conditions for equilibrium. All unknown forces can be determined strictly
from these equations.
• For a coplanar system equations of equilibrium are,
ΣX = 0
ΣY = 0
ΣM = 0
No. of unknown forces = equilibrium equation statically determinate
No. of unknown forces > equilibrium equation statically indeterminate
For statically indeterminate systems, additional equations needed to
solve for the unknown equations and they are obtained as compatibility
equations.
Determinacy
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Statically determinate
Statically indeterminate to the second degree
Determinacy
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Statically indeterminate to the first degree
Statically determinate
Determinacy
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Statically indeterminate to the first degree
Statically determinate
Determinacy
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Simply supported beam
Continuous beam with hinges
Continuous beam
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Three-hinged arch Three-hinged frame
Single span hinged frame
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Multi-span hinged frame
Arch Frame
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Trusses
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Simply supported truss
Multi-span truss
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Trusses
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Simply supported roof truss
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INTERNAL LOADINGS
N, T & M
Covered in Strength of
Materials
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• In order to design a structural element (beam and column), it is
necessary to determine the maximum normal force, shear and
moment in the element.
• Engineers need to know the variation of normal force, shear and
moment (normal, shear and moment diagrams) along the beam
to determine a cross-section and/or suitable structural material.
• To draw these graphs
– First, obtain support reactions
– Then, express N, T and M as functions of arbitrary position x
along axis.
Normal Force, Shear and Moment Diagrams
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Sign convention
• Although choice of sign convention is arbitrary, in this course, we
adopt the one often used by engineers:
N, T, M Diagrams
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Shear and moment diagrams Example
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• Relations between load and shear force:
0
0
limx
V V V w x
dV Vw
dx x
D
C
x
D C
x
V V wdx
• Relations between shear and bending moment:
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0 0
02
lim lim
x x
xM M M V x w x
dM MV w x V
dx x
D
C
x
D C
x
M M V dx
Relations Among Load, Shear Force, and Bending Moment
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Regions of distributed load
dV
dx = w(x)
dM
dx = V
Slope of shear Slope of moment
= distributed load = shear
Graphical Method for Constructing Shear and Moment Diagrams
V = ∫ w(x) dx M = ∫ V(x) dx
Change in shear
Change in moment
= area under distributed loading
= area under shear
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Regions of concentrated force and moment
Graphical Method for Constructing Shear and Moment Diagrams
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Regions of distributed force
Graphical Method for Constructing Shear and Moment Diagrams
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ANALYSIS OF STATICALLY DETERMINATE STRUCTURES
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Simply Supported Beams
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Statically Determinate Beams
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Cantilever Beams
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2 m
P2
P1
A
B
4 t/m3 t
1 t
8 m
2 m
4 m
Statically Determinate Frames
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Hibbeler, R.C. `Structural Analysis`, Prentice Hall.
Yorulmaz, M., Özgen, K. `Yapı Statiği`, Birsen Yayınevi
Lecture Notes by Associate Prof.Dr. Serdar Soyöz
TS498- Yapı Elemanlarının Boyutlandırılmasında Alınacak
Yüklerin Hesap Değerleri - Design Loads For Buildings
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REFERENCES