# Foundation

This section defines the foundation footings for the pier columns.

{% hint style="info" %}
**Navigation:** Substructure > Foundation
{% endhint %}

## Overview

The foundation system consists of:

* Rectangular footings for standard pier columns
* Custom-shaped footings for special pier configurations

## Sections

| Section                                                                                                                                                                     | Description                         |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------- |
| [Rectangular](https://docs.openbrim.org/examples/steel-bridge-examples/example-steel-tub-girder-bridge-ex1-stg/substructure-ex1-stg/foundation-ex1-stg/rectangular-ex1-stg) | Define rectangular footing geometry |
| [Custom](https://docs.openbrim.org/examples/steel-bridge-examples/example-steel-tub-girder-bridge-ex1-stg/substructure-ex1-stg/foundation-ex1-stg/custom-ex1-stg)           | Configure custom-shaped footings    |

{% hint style="success" %}
Complete foundation definitions before defining piles.
{% endhint %}