> 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-i-girder-bridge-ex1-sig/substructure-code-checks-ex1-sig.md).

# 12. Substructure Code Checks

This section applies the code check templates to verify substructure components per AASHTO LRFD 9th Edition.

{% hint style="info" %}
Substructure code checks verify capacity under all load combinations, including seismic considerations where applicable.
{% endhint %}

## Substructure Code Checks

| Check                                                                                                                                                                | Description                    |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------ |
| [Pier Cap Code Check](/examples/steel-bridge-examples/example-steel-i-girder-bridge-ex1-sig/substructure-code-checks-ex1-sig/pier-cap-code-check-ex1-sig.md)         | Flexure and shear in pier caps |
| [Pier Column Code Check](/examples/steel-bridge-examples/example-steel-i-girder-bridge-ex1-sig/substructure-code-checks-ex1-sig/pier-column-code-check-ex1-sig.md)   | Axial-moment interaction       |
| [Pier Footing Code Check](/examples/steel-bridge-examples/example-steel-i-girder-bridge-ex1-sig/substructure-code-checks-ex1-sig/pier-footing-code-check-ex1-sig.md) | Bearing, flexure, and shear    |
| [Pile Capacity Check](/examples/steel-bridge-examples/example-steel-i-girder-bridge-ex1-sig/substructure-code-checks-ex1-sig/pile-capacity-check-ex1-sig.md)         | Axial and lateral capacity     |

## Checks Performed

### Pier Cap

* Flexural strength at critical sections
* Shear strength with stirrup design
* Serviceability (crack control)

### Pier Column

* P-M interaction at all limit states
* Slenderness effects
* Confinement requirements

### Pier Footing

* Bearing pressure distribution
* One-way and two-way shear
* Flexural reinforcement

### Pile

* Axial compression capacity
* Lateral load capacity
* Group effects (if applicable)


---

# 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-i-girder-bridge-ex1-sig/substructure-code-checks-ex1-sig.md?ask=<question>&goal=<endgoal>
```

`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.