# 12. Substructure Code Checks

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

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Substructure code checks verify capacity under all load combinations, including seismic considerations where applicable.
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## Substructure Code Checks

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