Internal Cross-frame K Top

This section defines K-type internal cross-frames inside the tub girders.

Navigation: Superstructure > Bracing > Internal Cross-frame K-Top

For detailed parameter explanations, see the Internal Cross-frame K-Top Reference.

Steps

Step 1: Navigate to Internal Cross-frame K-Top

Navigate to Bracing > Internal Cross-frame K-Top in the tree view.

Internal Cross-frame navigation

Step 2: Assign Girder

Click the three-dot icon on the Girder cell and set G1 to place cross-frames inside that girder.

Step 3: Define Cross-Frame Stations

Enter the Station locations for each cross-frame along G1 and G2.

Station locations

Step 4: Assign Chord Sections

Navigate to the Sections tab and assign sections:

1. Click the three-dot icon on Top Chord Section

2. Click Select

3. Choose AISCL6X6X7/8 from the imported sections

4. Apply the same section to Diagonal Chord Sections

Section assignment

Section selection

Completed sections

Step 5: Configure Chord Geometry

Navigate to the Chord Geometry tab and enter 18 for "Diagonal Chord Inner Offset from Top Web" for all cross-frames.

Chord geometry

Quick Tip: End Offsets

The "Diagonal Chord Inner Offset from Top Web" parameter incorporates end offsets for truss elements in the FEA model.

Step 6: Optional Gusset and Stiffener Settings

Modify Gusset Plate and Stiffener tabs if desired. These affect 3D visualization only, not the FEA model.

Gusset plate

Stiffener

Verification

The completed K-Top internal cross-frames are shown below.

Completed cross-frames 3D

Completed cross-frames detail