> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/examples/steel-bridge-examples/example-steel-tub-girder-bridge-ex1-stg/superstructure-ex1-stg/bracing-ex1-stg/internal-cross-frame-k-top-ex1-stg.md).
# Internal Cross-frame K Top
This section defines K-type internal cross-frames inside the tub girders.
{% hint style="info" %}
**Navigation:** Superstructure > Bracing > Internal Cross-frame K-Top
For detailed parameter explanations, see the [Internal Cross-frame K-Top Reference](https://docs.openbrim.org/templates/steel-tub-girder-bridge-workflow/superstructure-stg/bracing-stg/internal-cross-frame-k-top-stg).
{% endhint %}
## Steps
### Step 1: Navigate to Internal Cross-frame K-Top
Navigate to **Bracing > Internal Cross-frame K-Top** in the tree view.
### 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.
### 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**
### 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.
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.
## Verification
{% hint style="success" %}
The completed K-Top internal cross-frames are shown below.
{% endhint %}
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.openbrim.org/examples/steel-bridge-examples/example-steel-tub-girder-bridge-ex1-stg/superstructure-ex1-stg/bracing-ex1-stg/internal-cross-frame-k-top-ex1-stg.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.