HyeYeon Lee midas IT
Poland
2015
MIDAS
TECH TALKPC Composite and PSC Box Girder Bridge Design
Poland
2015
HyeYeon Lee midas IT
Poland
2015
MIDAS
TECH TALKPC Composite and PSC Box Girder Bridge Design
1. PC Composite Girder Bridge Design
2. Modeling Features of PSC Box Girder
3. Practical Analysis and Design of PSC Box Girder
Poland
2015
MIDAS Information Technology Co., Ltd. 4
Modeling of Composite Girder
Plate + Beam Model All Plate Model
Grillage Beam Model
1. PC Composite Girder Bridge Design
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What is grillage model
Structure is idealized as a number of
longitudinal and transverse beam
elements in a single plane, rigidly
interconnected at nodes.
Grillage mesh
(a) Grid of longitudinal and transverse
beams
(b) Longitudinal beams at center a little less
than lane width
(c) Deck with contiguous beam
(d) Two longitudinal members per larger
beam
Structural Analysis for Grillage Bridge
1. PC Composite Girder Bridge Design
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Spacing of Transverse Beams
1/4~1/8 of the effective span
Generally 1.5 times of the spacing of the longitudinal members
Spacing of Longitudinal Beams
1/4~1/10 of the effective span
Less than 2d or 3d
Direction of Transverse Beams
Modeling of Grillage Model
1. PC Composite Girder Bridge Design
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Flexural stiffness (Iyy)
Shear area (Asz)
Grillage Modeling Separate model for calculating Iyy
Grillage Modeling Separate model for calculating Asz
Modeling of Cross Frame
1. PC Composite Girder Bridge Design
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Torsionless Design
Torsion constants of PC I-girder: 1/10 of bending inertias
Torsion constants of steel composite girder: 1/60 of bending inertias
=> Simplify model by ignoring torsion effect in a safe manner
PC I-Girder Steel Plate Girder
Modeling of Grillage Model
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 9
Types of 3D model
(1) All Plate model
(2) Deck (Plate element) + Girder (Beam element)
(3) Deck (Plate element) + Girder top & bottom flange (Beam element) + Girder web
(Plate element)
Plate + Beam Model All Plate Model
Modeling of 3D Model
1. PC Composite Girder Bridge Design
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Purpose of Bracing
(1) Assists construction
(2) Restrain the bottom flange where they are in compression near
intermediate supports
Bracing type
Single Beam
X-Bracing
K-Bracing
Modeling of 3D Model
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 11
Advantage of 3D Model
(1) Automatically account for shear lag (dependent on the fineness of the mesh)
(2) Concrete slab that is cracked in longitudinal tension can be modeled
(3) Effective moment, shear, axial force on composite beam section can be
determined from the stresses
(4) Verification buckling resistance is available.
(5) Large displacement analysis is available.
(6) More realistic model by considering bracing
Local Direction Force Sum
Modeling 3D Model
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 12
Comparison between grillage model and 3D model
Items Grillage model 3D model
Analysis Time Short Long
Checking the member forces Easy (Beam force diagram)Complex (Resultant force from meshed
plate elements)
Accuracy Less accuracy
High accuracy
(Considering Warping stress, shear
force about longitudinal direction in
slab )
Cross Frame Considering as a Single beamConsidering either Single beam or 3D
bracing
Nominal Member
Required
(at the end of slab in longitudinal
direction)
Not required
Applicable bridge type Beam and Slab type bridge deck only Any type of bridges
Transverse beam Required Not required
Torsionless Design Optional Not required
Modeling of Composite Girder Bridge
1. PC Composite Girder Bridge Design
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Composite Sections
Various Section Properties
1. PC Composite Girder Bridge Design
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Quick Generation of General Composite Section
1. PC Composite Girder Bridge Design
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Composite I-Girder Composite Section for Construction Stage
Modeling of Composite Girder
1. PC Composite Girder Bridge Design
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Three Modeling Method for Composite Section
1. PC Composite Girder Bridge Design
Method 1 Method 2 Method 3
Sequential Analysis +
Accurate Time Dependent Material
Sequential Analysis +
Long-term Modular Ratio of 3n
Composite Action
without Sequential Analysis
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Tendon Template
1. PC Composite Girder Bridge Design
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Tendon Template Tendon Profile
PSC Value sections UK code DB
( UK-M, UK-SY, UK-TY, UK-TYE,
UK-U, UK-Y, UK-YE )
Add
AutoGeneration
Easily Generated Tendon Profile
Tendon Template
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 19
Considering Reinforcement of Deck in Analysis and Design
1. PC Composite Girder Bridge Design
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Resultant Force Diagram
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 21
Steel Composite Girder Bridge Wizard
1. PC Composite Girder Bridge Design
Layout : Defining the basic geometry of a bridge• Girder Type and Modeling Type• Bridge Alignment• Span• Substructure• Boundary Condition
Section : Defining the section and location of deck, bracing and girder• Transverse deck element• Bracing• Girder
Load : Defining the Dead and live Load conditions• Before and after composite dead loads• Live loads
Construction Stage : Defining the detailed construction sequence• Construction stage• Reinforcement of Deck
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Different Support Skew and bracing type
Composite Steel Tub model
All PlateDeck as Plate
Deck & Web as Plate
Construction Stage with Deck pouring Sequence
Tapered Girder section
1. PC Composite Girder Bridge Design
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Select the desired Ultimate Limit States
Enter the Partial Factors and Parameters
Optimized Design as per EN1992-2
1. PC Composite Girder Bridge Design
Select the desired Service Limit States
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Optimized Design as per EN1992-2
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 25
Optimized Design as per EN1992-2
1. PC Composite Girder Bridge Design
MIDAS Information Technology Co., Ltd. 26
Optimized Design as per EN1992-2
1. PC Composite Girder Bridge Design
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Optimized Design as per EN1992-2
Design Parameter Shear Resistance
1. PC Composite Girder Bridge Design
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Bridge Wizard for PSC Box Girder Bridge
Suspension Bridge Wizard
Cable Stayed Bridge Wizard
ILM Bridge Wizard
FCM Bridge Wizard
MSS Bridge Wizard
FSM Bridge Wizard
RC Frame/
Box Culvert Wizard
RC Slab Bridge Wizard
Grillage Model Wizard
Transverse Analysis Model Wizard
Segmental Bridge Model Wizard
PSC Bridge Wizard
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 29
Balanced Cantilever Method Bridge Wizard
2. Modeling Features for Practical Analysis
Bridge Layout Tapered Sections Tendons
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Web TendonsFlange TendonsBridge Layout
Incremental Launching Method Wizard
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 31
Full Staging and Movable Scaffolding Wizard
FSM Wizard MSS Wizard
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 32
Transverse Analysis Wizards
Selection Load Tendon
2. Modeling Features for Practical Analysis
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Various Built-in PSC Sections
2. Modeling Features for Practical Analysis
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User Defined Section Generation
Define any sectional shape using SPC
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 35
Automatic Generation of Tapered Section
2. Modeling Features for Practical Analysis
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PSC Reinforcement
Shear Reinforcement
Strengthening Effect by shear reinforcement
and shear bars
Enclosing Stirrup for Torsional Strength
Longitudinal Reinforcement
Transformed Section
Confinement Effect by Creep
Considered in PSC Design
2. Modeling Features for Practical Analysis
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• Typical tendon : Defines lumped
representative tendon. Only one
tendon profile is defined at the
centroid of the all the tendons. It is
multiplied with number of tendons at
the time of analysis.
• X Axis Rot Angle: The tendon placed
in the table is rotated about its local
x-axis by the specified angle. Useful
while placing tendons on inclined
webs.
Tendon Profile Generation
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 38
Tendon Profile Generation
Draw Tendon Profile using CAD
Import DXF file through Tendon
Profile Generator
Import Tendon Profile
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 39
Moving Load Tracer
Step 1
Moving Load Code
Step 2
Traffic Line Lane or Traffic Surface
Lane
Step 3
Standard Vehicle or User-defined
Vehicle
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 40
2. Modeling Features for Practical Analysis
Vehicle Load
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Seasonal Temperature- Element Temperature- System Temperature- Nodal Temperature
Temperature Variation- Beam Section Temperature- Temperature Gradient
Effects of Temperature Distribution and Restraint Conditions
Temperature Loads
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 42
Time Dependent Materials
Material Code
Eurocode
CEB-FIP (1990)
CEB-FIP (1978)
ACI
PCA
Combined (ACI&PCA)
AASHTO
IRC 18
User Defined
Creep & Shrinkage Compressive Strength
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 43
Time Loads for Construction Stage
• Impose Time Load to
specific members to reflect
the time dependent material
properties relative to the
contiguous members.
2. Modeling Features for Practical Analysis
MIDAS Information Technology Co., Ltd. 44
Maximum Bending Moment
Envelope upon Completion
Minimum Bending Moment
Envelope upon Completion
Bending Moment Diagram for Each Construction Stages
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 45
Primary and Secondary Forces
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 46
Node Tip Deflection
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 47
Bridge Girder Diagram
Bridge Girder Diagram
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 48
Sig-xx, Position 1
Sig-xx, Position 9
PSC Beam Stress Diagram
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 49
Tendon Loss Table and Graph
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 50
Tendon Stress Limit Check
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 51
FCM Camber
4. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 52
Element Properties at Each Stage
- Age of Element
- Elastic Modulus
- Shrinkage Strain
- Creep Coefficient
Beam Section Properties at the Last
Stage
- Transformed Section Properties
- Neutral Axis Position Change
Section Properties at Each Stages
3. Practical Analysis and Design of PSC Box Girder
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PSC Design
Bridge Load Rating Design
Composite Plate Girder Design
Structural Steel Design
Reinforced Concrete Design
SRC Design
AASHTO-LRFD02
AASHTO-LRFR
EN 1994-2
SSRC79
AIJ-SRC01
JGJI38-01
AIK-SRC2K
TWN-SRC92
AASHTO-LFD96
ACI318-02
CSA-S6-00
EN 1992-2
JTG D62-04
JSCE02
KSCE-USD05
KSCE-RAIL-USD04
JTJ023-85
IRC:21-2000
KCI-USD99
KSCE-USD96
TWN-BRG-LSD90
EN 1993-2 (new in 2012)
AASHTO-LRFD02
AASHTO-LFD & ASD96
AISC-LRFD2K
AISC-LRFD93
AISC-ADS89
BS5950-90
JTJ025-86
IS:800-2007
KSCE-ASD96
TWN-BRG-LSD90
TWN-BRG-LSD90
AASHTO-LRFD08
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 54
Select PSC Design Results
PSC Design as per Eurocode2-2:2005
Select Tendon / Bridge / Construction types
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 55
Cross section stress design results table
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 56
Design Report (EXCEL compatible)
Design Parameter
Flexural Resistance
3. Practical Analysis and Design of PSC Box Girder
MIDAS Information Technology Co., Ltd. 57
Design Report
3. Practical Analysis and Design of PSC Box Girder
Thank you!