Navigate to Girders > Concrete U Girder in the tree view.
Navigation
Step 2: Assign Girder Layout
Click the three-dots icon on the Girder Layout cell and select GL1 from the dropdown.
Step 3: Edit Girder Sections
Click the three-dots icon on Girder Sections and select Edit.
Edit Sections
The CUG1 beam will have section variations according to station. The sections U78G5 and U54G5 (defined in the Sections page) are applied at different stations.
Section Variations
Step 4: Define Section Stations
Select the Reference Support Line option.
Use the Station Difference Along PGL parameter to designate the specific station where each section is positioned.
Station Definition
Step 5: Set Variation Transitions
Define the desired appearance of variation transitions between sections.
Variation Transitions
Step 6: Apply Configuration to All Spans
Apply the station-dependent configuration for SL1 (Reference Support Line) throughout the entire bridge span.
All Spans
Step 7: Set Haunch Thickness
Enter Haunch Thickness as 4 inches.
Haunch Thickness
Quick Tip: Haunch Thickness
The haunch is the concrete buildup between the top of the girder and the bottom of the deck slab.
Haunch Diagram
Step 8: Configure FEA Settings
Navigate to the FEA Settings tab.
FEA Settings
When you define a RigidSection in the Section spreadsheet, OpenBrIM automatically assigns the Rigid Section parameter. The girder FE model uses FeLine elements for flanges and FeSurface elements for the web.
Step 9: Define Second Girder
For the second girder, use GL2 in the Girder Layout.
Second Girder
Replicate all actions performed for CUG1 for CUG2.
Verification
After completing these steps, the girders should appear as shown below.
