Contents
• Model Summary
1. Project Information
• Bridge Overview
• Bridge Type
2. Quick review:
• Steel Composite Wizard
• Limitation of the Wizard
3. Time dependent material
4. Boundary Conditions
5. Traffic loading
• New Zealand Bridge Manual Traffic Loading
• Traffic Loading in Midas Civil
6. Response Spectrum
• New Zealand NZS1170 Design Code
• Quick review: How to apply the response spectrum
• Things to check
7. Temperature Loading
8. Water Flow
9. Bridge Manual ULS and SLS Checks
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1. Target Bridge
Bridge Type
• Structure Type : Composite Steel I Girder Bridge
• Bridge Information
• Span : 66.5m + 73.5m + 66.5m = 206.5m
- Superstructure : Composite Steel I Girder
- Pier, Pile Cap and Piles : Concrete structure
Longitudinal & Section View
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1. Purpose of analysis
Analysis Type
• Analysis Type ; Global analysis of the bridge
• Purpose ; 1) Check the capacity of the superstructure
2) Check the capacity of the substructure
3) Check the capacity of the connections
Plan & Cross-Section View
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1. Workflow
SETUP MATERIAL FINALISE
STEEL COMPOSITE
AND SECTION GEOMETRY OF
WIZARD
PROPERTIES THE BRIDGE
APPLY TIME
APPLY EIGEN APPLY VARIOUS
DEPENDENT AND
VALUE ANALYSIS STATIC LAODINGS
COMPOSITE INFO.
APPLY COMBINED
APPLY RESPONSE APPLY MOVING LOAD CASE AND
SPECTRUM LOADS DO DESIGN
CHECKS
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2. Quick Review
Steel Composite Wizard
1
Basic Geometry
Provide functionality to input span width, l
ength, angle of skewness and bend radius
2
Substructure
Define the basic geometry for substructure. In
this case, I defined the substructure to positio
n it in the model so it is easier to modify and
build the rest of the substructure later.
Tip
Set up materials and
section properties prior
to using the wizard.
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2. Quick Review
Steel Composite Wizard
This tab is where you setup the grillage
model for the Steel Composite I Girder.
Typical Cross Section View of the Bridge
Tip
Save the wizard and run
the output for review
after setup
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2. Quick Review
Steel Composite Wizard
This tab is where you setup the grillage
model for the Steel Composite I Girder.
Typical Cross Section View of the Bridge
Tip
Save the wizard and run
the output for review
after setup
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2. Quick Review
Steel Composite Wizard
This tab is where you setup the common
load cases.
Typical Cross Section View of the Bridge
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2. Quick Review
Steel Composite Wizard
1 5 9
2 6 10
3 7 Tip
Define construction staging
in Wizard for superstructure
saves a lot of time in
4 8
modelling
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2. Quick Review
Construction Staging Overview
Activate the substructure of the bridge with all the
boundary conditions and self-weight of the bridge.
Ensure all the substructure weight are activate in this
stage.
Activate the bridge superstructure with the steel girder
in hogging moment zone. Ensure that it is at non-
composite stage.
Activate the end spans where the girder gets
launched from either end of the abutment.
Complete the instalment of the middle span with
girder on the top of piers in composite stage.
Activate composite section for construction stage
and complete the bridge construction stage with
adding long term effect for creep & shrinkage.
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2. Quick Review
Construction Staging Overview
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2. Quick Review
Limitation of the Wizard
1) Substructure Modelling
2) Tapered Section Groups
3) Effective Width Scale Factor
4) Composite Span Information
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3. Time Dependent Material
1 3
2
Note
The time dependent
material has Bridge
Manual and AS5100 in
the selection. It is
good for capturing
creep and shrinkage
loading.
Note: construction
staging need to be
activated to capture
creep and shrinkage
loads
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4. Boundary Conditions
Bearings
Bearing Configuration
Elastic Link Configuration in Midas
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4. Boundary Conditions
Soil Parameter
Tip 1 2
This is a fast workflow that I
found useful when applying
soil spring to the piles
3 4 5
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5. Traffic Loadings
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5. Traffic Loadings
Tip
Define Moving Load
Case based on Canada
Moving Load Code as
New Zealand Bridge
Manual uses the same
reduction factor as Checking
Canada code.
Use Transverse Lane
Optimization to
simulate the vehicle
application on the full
width of the bridge.
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6. Response Spectrum
New Zealand NZS1170 Design Code
Horizontal Seismic Loading
Vertical Seismic Loading
Spectral Shape Factor
Note
A number of iteration required to determine
the base shear factor using Response
Spectrum analysis instead of equivalent static.
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6. Response Spectrum
Quick review: How to apply the response spectrum
1 2
1. Use the eigenvalue function to
determine the natural period of the
structural. For longitudinal,
transverse and vertical.
2. Calculate the response spectrum
value using NZS1170.5
3. Input the response spectrum profile
into the response spectrum function
4. Add response spectrum load case
5. Get the output load from the
3 4 seismic load case and calculate the
equivalent base shear factor
6. Update response spectrum load
case scale factor
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6. Response Spectrum
Things to check
Modal Participation Masses
Eigenvalue Analysis
Things I usually check are:-
1. Period and Frequency
2. Modal participation masses
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7. Temperature Loading
Temperature Load in the NZ Bridge Manual
Uniform Temperature Application in Midas
Temperature Gradient Application in Midas
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8. Water Flow
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9. Bridge Manual ULS and SLS Checks
Output from Midas Civil
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9. Bridge Manual ULS and SLS Checks
2 4
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QUESTIONS?
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Visit Midas Bridge Blog
for more content
https://www.midasbridge.com/en/blog
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