> 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/overview-of-the-bridge-model-ex1-stg.md).

# Overview of the Bridge Model

This section provides an overview of the Steel Tub Girder Bridge model configuration and parameters.

{% hint style="info" %}
**Navigation:** Overview of the Bridge Model
{% endhint %}

## Bridge Configuration

The example Steel Tub Girder Bridge demonstrates a typical highway bridge with:

* Steel tub (box) girders as primary superstructure elements
* Composite concrete deck
* Internal and external bracing systems
* Multi-column pier substructure
* Pile-supported foundations

## Model Features

This example showcases the following OpenBrIM capabilities:

| Feature             | Description                                 |
| ------------------- | ------------------------------------------- |
| Parametric Geometry | Alignment-driven girder and deck geometry   |
| Staged Construction | Girder erection and deck pouring sequences  |
| Composite Action    | Non-composite and composite girder behavior |
| Code Compliance     | AASHTO 9th Edition design checks            |

{% hint style="success" %}
Review this overview before beginning the step-by-step modeling process.
{% 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 by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.openbrim.org/examples/steel-bridge-examples/example-steel-tub-girder-bridge-ex1-stg/overview-of-the-bridge-model-ex1-stg.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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.