solution for bridges design & analysis
TRANSCRIPT
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Solution for Bridges
Design & AnalysisThe state–of–the–art technology
for the civil engineering world
Dr. Dimitrios Sofialidis
Technical Manager
SimTec
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Main Features
• Concrete Creep and Shrinkage
• Bridge layout modeling (in plan and elevation view)• Utilities for generating common bridge sections and
layout design• Geometric and finite element model generation with
both Beams (1D) and Solid elements (3D)• Loads Generation
• Overloads• Moving loads (vehicle’s editor)• Utility for Prestressing forces input• User loads
• Automatic Loads combination
• Simulation of the construction process
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Concrete Creep and Shrinkage• Effects of Creep and Shrinkage relative to concrete maturity can be easily
considered• Allows to obtain the deformed
shape as well as the forces,moments and stresses in the model
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Bridge Layout Modeling
• This utility allows to generate the geometry and the finite element model of the bridge from common engineering blueprints. It works as a "layout program", allowing to define the layout design in both plan and elevation views
• The procedure used for the bridge layout definition is the following:• Definition of the mileage points (MP’s) that represent the
structure axis• Definition of plan and elevation layout
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Bridges Layout in Plan View• In plan view, the mileage points line is a succession of user-
defined stretches:• straight segments • circular arcs• clothoid arcs
Caso R = R : Definition of the section elementsi f
/
(x ,y )i i
(x ,y )f f
R
i
f
s = s + Long
R
ii
s x
y Clothoid axis
cl
cl
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Bridge Layout in Elevation View• In elevation view, the mileage points line is a succession of user-
defined stretches:• straight segments • parabolic arcs
Vertical fillet
si
sf
i
ff
L
T
zf
zi
sStraight section
Straight section
Parabolic fillet
s
si f
i i
z
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Bridge Cross Sections
Bridge Section Types
Rectangular section
Trapezoidal section
Trapezoidal section with flanges
Polygonal section with two bends
Polygonal Asymmetric with two bends Note: The upper line (deck) is alwayshorizontal. The slope must be laterdefined with the section’s bank.
B
DEPTH
RS
BTOP
BBOT
DEPTH
TTOPTS
DEPTH
BTOP
BM
BBOT
TTOP
TBOTTF
TBOT BBOT
BM2
BM1
BTOP
DEPTH
TTOP
TMPS
BBOTR
BM2R
BM1R
BTOPRBTOPL
BM1LBM2L
BBOTL
DEPTHL
TBOTL
TML
TBOTR
TTOPR
TMR DEPTHR
axis
PATri-cell box section definition
a1
p11
b1
a2
t 22 t 21
t 11
p21p22
s31
1
1
p121
11
t 31
hL
vL
y
z
vCL
hCL
hCU
vCU
t 41
vU vUr
hU hUr
a /20
vCUr
hCUr
hCLr
vCLr
• This module includes a library of typical bridge cross sections, which are defined by the outline of the section:• Slab cross sections• Box cross sections
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Slab Concrete Sections• It’s possible to define holes
• The sections can be symmetric or asymmetric
• Sections and the hole diameters might vary along the bridge
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Box Sections with Variable Depth• Any generic box section can be easily defined• All the necessary input parameters can be introduced either by
menu or using the corresponding command (allows performing a parametric design of cross sections, creating macros, etc).
Tri-cell box section definition
a1
p11
b1
a2
t 22 t 21
t 11
p21p22
s31
1
1
p121
11
t 31
hL
vL
y
z
vCL
hCL
hCU
vCU
t 41
vU vUr
hU hUr
a /20
vCUr
hCUr
hCLr
vCLr
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Assigning Attributes
• The cross sections may have the following attributes:• Offsets• Banks• Skew• Hollow or solid sections
z
y
Zoffs
Yoffs
MP,s line
Bank (Rotation's center P) P
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Model Generation• Once the layout and cross sections are defined the geometrical and FEM
model generation can be automatically performed by the program
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Model Generation• Once the layout and cross sections are defined the geometrical and FEM
model generation can be automatically performed by the program
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Model Generation
Beam element model (shape option)
Solid element model
Just by specifying an element type, a Solid finite element model or a Beam finite element model can be generated
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A. Suspension Bridges WizardSuspension Bridge Generator windows can generate 3D
models for:
• Concrete Suspension Bridges(with a CivilFEM bridge section)
• Steel Suspension Bridges(with a CivilFEM 3D steel truss pattern)
• Generic Suspension Bridges(with a CivilFEM generic cross section)
• Mixed section, two types of section:
- Concrete slab over I-section steel beams
- Concrete slab over a steel box section
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A. Suspension Bridges Wizard• By using this Wizard it is possible to easily introduce the
number of segments and the corresponding data to generate
the entire bridge model for both 3D beams and solid elements.
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A. Suspension Bridges WizardConcrete
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A. Suspension Bridges Wizard• Both concrete and steel truss suspension bridge models are
automatically generated for any generic configuration by just inputting a
few parameters.
Steel
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A. Suspension Bridges Wizard
Steel
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A. Suspension Bridges Wizard• Any generic cross section from library and/or any 2D defined using
CivilFEM with ANSYS meshed drawing (capture utility) can be used as a
bridge cross section
• Optimization of the geometry
and initial tensions of cables
Generic
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A. Suspension Bridges Wizard
Bridge section is composed of a concrete slab over
I-section steel beams:
• Mixed Section (type 1)
nB bB
hBea
m
tFL
tWeb
yz
bSlab/2bSlab
tSla
bfSRfSL
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A. Suspension Bridges Wizard• Mixed Section (type 1)
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A. Suspension Bridges Wizard• Mixed Section (type 1) Example
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A. Suspension Bridges Wizard
Bridge section is composed of a concrete slab over a steel box section:
• Mixed Section (type 2)
bSlabfSL fSR
hBox
tSla
b
tboxLtboxR
tboxB
alphaL
alphaR
yz
bSlab/2
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A. Suspension Bridges Wizard• Mixed Section (type 2)
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A. Suspension Bridges Wizard• Mixed Section (type 2) Example
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A. Suspension Bridges Wizard• Supported Bridge Examples
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B. Cable Stayed Bridge Wizard
• Generation window
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B. Cable Stayed Bridge Wizard
• Model generation
• Cable arrangements:
HARP TYPE FAN TYPE
z
x
XL1XL2XL...
XR1 XR2 XR...
ZB1
ZB2
ZT1
ZT2
ZT...
ZB...
ZT3
(XB, ZB)
(XT, ZT)
z
x
XL1XL2XL...
XR1 XR2 XR...
ZB1
ZB2
ZT1
ZT2
ZT...
ZB...
ZT3
(XB, ZB)
(XT, ZT)
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B. Cable Stayed Bridge Wizard• Model generation
• Towers: Unlimited in number, variable cross sections,
vertical or inclined with multiple cable arrangements
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B. Cable Stayed Bridge Wizard
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M N
M X
XY
Z
B. Cable Stayed Bridge Wizard• Nonlinear Construction Process Analysis:
XY
ZX
Y
ZX
Y
Z
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B. Cable Stayed Bridge Wizard• Nonlinear Construction Process Analysis:
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B. Cable Stayed Bridge Wizard• Nonlinear Construction Process Analysis:
• Cable force optimization: Deflection
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B. Cable Stayed Bridge Wizard• Nonlinear Construction Process Analysis:
• Cable force optimization: Bending Moment
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C. Arch Bridge Wizard
• Arch Bridge Generator (Beam Model)
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C. Arch Bridge Wizard• Depending on the position of the bridge deck
compared to the arch, there are different cases:
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C. Arch Bridge Wizard
• Beam Model
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C. Arch Bridge Wizard
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C. Arch Bridge Wizard
• Shell Model
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Bridge Components• CivilFEM with ANSYS allows a detailed analysis of
piers, cross bracings, diaphragms, etc.
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Special Features
• Any of the bridge parameters (layout, sections, dimensions, etc.) can be easily parameterized by the user, allowing very fast sensitivity analysis, making use of some advanced features:• Log files
the program stores in a file all the orders executed by the program during a job. This file can be edited by the user at any time and the model can be executed again by just reading it
• Macros (APDL)
• Customization: users are able to create their own windows, commands, etc, customizing the program as much as possible to their own needs
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Loads Generation
• CivilFEM automatically generates the loads corresponding to the various load hypotheses over a 2D or 3D structure, such as:• Moving loads (traffic loads)• Surface loads (Overloads)• Prestressing tendons
• Any kind of "user defined" loads• "Smart" load combination of all
the load steps generated during the analysis
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Loads Generation (Traffic Loads)
Vehicle library: just choose the vehicle and the corresponding properties are automatically
defined
Property window
• With the vehicle editor it is possible to create, import from library, modify, copy, delete and list vehicles
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Loads Generation (Traffic Loads)• Two different types of vehicles: Rigid (truck) or flexible (train,
adaptable to the path)• User friendly path definition: road surface and road axis are
automatically detected by the program
Trajectory definition (Rigid vehicle)
MP,s
line components
Vehicle trajectory
Assembly the bridges nodes and elements, where the loads are applied
Dist
The tangency occurs in the point (xLoc, yLoc) of the vehicle
Trayectory definition ( )adaptable to the trajectory
KP,s
Lines component
Vehicle trayectoryAssembly the bridges nodes and elements, where the loads are applied
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Loads Generation (Surface Loads)
Definition of surface loads
KP,s
Lines
component
Overload
grid
s1
d1
d2
dm
Assembly with the bridges nodes and elements over which the
surface load will be applied
• Definition of an overload grid over the deck• Automatic load generation and combinations of all possible load
case scenarios
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Loads Generation (Prestressing Cables)
• Definition of points along the cable’s path (automatic adjustment of the points using splines)
• Introduce the tensile force at specific locations in the tendon’s path• Automatic transfer of the cable action to the structure:
• the program calculates an equivalent system of forces at each node of the element that equilibrate the system
3D spline generation
P
P
P P
P 1
2
k+2 k+1
N
P' 1 P' N
P k
Transmision of the cable actions to the model
OP
xR
R
MRy
z
MRz
xMR
c.d.g.R
y
Kfx
Kfy
Kfz
T1
T2
1
2
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Load Combination• In the bridge analysis process, a great number of load
steps are generated, which later on have to be combined looking for the worst case scenario. CivilFEM includes functionalities that can automatically handle all possible load cases
• Obtains the envelop that considers the worst case scenario for each structural point by specifying a target
• Concomitance at both global and element levels• Variable load coefficients can be defined • Combining the moving loads (traffic loads)
• The program automatically combines them as an "incompatible" load (which is the same as saying that a vehicle can only be located at one position at the same time)
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Load Combination
• Combining the surface loads (overloads)• CivilFEM will automatically combine them as a
"compatible" load (these loads will then be allowed to be located at any possible position over the surface)
To obtain the envelop of maximum vertical displacements at all nodes
OBJECTIVE:
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Load Combination
• Combining the prestressing cable loads• The program automatically combine them as an
"addition" load (adds all the loads and apply them at the same time)
• Combining "user-defined" loads• The same procedure is applied simply by defining the
combination rule to be used (compatible, incompatible, addition, selection, etc) to find the combined results
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Checking & Design• Serviceability Limit State
• Cracking checking according to codes
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Checking & Design
• Ultimate Limit State
• Check and design of the bridge reinforcement according to codes, taking into account all the loads applied to the structure.
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Simulation of Construction Process
Normal Procedure
• The bridges module allows to simulate multiple types of construction process
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Simulation of Construction Process
Cantilever construction
Y
X
Puente construido mediante dovelas yuxtapuestas: Situación después del step #3
Y
Z
Pile Section: AreaU, I , I , AreaB, I ,I , HyyU
z
Bridge plant
Not builded zone
10 11 12 13
Sections
12
Steps
Live cable
7 8 9 14 15 161 2 3 4 5 6
23
11
2
3
H
Live pile support
Not live support
zzU yyB zzB
Pile section axis
Bridge section axis
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Simulation of Construction Process
12345
Proceso constructivo de un puente empujado
123
En la etapa inicial nacen cuatro seccionesy solo una de ellas está "empujada" (la una)
4
1234
En la segunda etapa se empuja una nueva sección (la 2), la sección 1 ha llegadoa un apoyo intermedio que al final de la construcción ocupará la 4
1234
En la tercera etapa nace la sección 5, perono se empuja ninguna nueva
5
En la última etapa el puente está completo. Las secciones 4 y 1 alcanzan sus apoyos definitivos.
12345 12345 12345 12345
En la cuarta etapa el puente está completo, pero tan solo se empujandos secciones..
6
6
Push launching
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Bridge Postprocessing• CivilFEM with ANSYS performs a wide range of postprocessing
calculations: load combinations, results displays, check and
design processes, etc.
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For more information, you may contact:
Dr. Dimitris Sofialidis
SimTec Ltd.
Technical Manager
www.simtec.gr