# Bridge Geometry

This section defines the geometric layout of the Concrete U Girder Bridge, including alignments, support locations, and girder configurations.

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**Navigation:** Bridge Geometry
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## Overview

Bridge Geometry establishes the foundational layout for the entire bridge model. This includes:

* **Roadway Alignment:** Horizontal and vertical alignment with cross-sections
* **Bridge Alignment:** Assignment of alignments to bridge structures
* **Support Lines:** Locations of abutments, piers, and temporary supports
* **Insertion Points:** Positioning of U-girders along support lines
* **Girder Layout:** Connection of insertion points to form girder lines

## Sections

| Section                                                                                                                                                             | Description                                                               |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| [Roadway Alignment](https://docs.openbrim.org/examples/concrete-bridge-examples/example-concrete-u-girder-bridge/bridge-geometry-ex1-cug/roadway-alignment-ex1-cug) | Define horizontal, vertical, and transverse alignment                     |
| [Bridge Alignment](https://docs.openbrim.org/examples/concrete-bridge-examples/example-concrete-u-girder-bridge/bridge-geometry-ex1-cug/bridge-alignment-ex1-cug)   | Assign roadway alignment to bridges                                       |
| [Support Lines](https://docs.openbrim.org/examples/concrete-bridge-examples/example-concrete-u-girder-bridge/bridge-geometry-ex1-cug/support-lines-ex1-cug)         | Define support line stations for abutments, piers, and temporary supports |
| [Insertion Point](https://docs.openbrim.org/examples/concrete-bridge-examples/example-concrete-u-girder-bridge/bridge-geometry-ex1-cug/insertion-point-ex1-cug)     | Position U-girders along support lines                                    |
| [Girder Layout](https://docs.openbrim.org/examples/concrete-bridge-examples/example-concrete-u-girder-bridge/bridge-geometry-ex1-cug/girder-layout-ex1-cug)         | Connect insertion points to create girder lines                           |

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Complete each section in order to establish the bridge geometry before proceeding to Properties.
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