> 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/concrete-bridge-examples/example-concrete-u-girder-bridge/properties-ex1-cug/sections-ex1-cug.md).

# Sections

This section defines cross-sectional properties for U-girders, columns, pier caps, end bents, and piles, including reinforcement layouts.

{% hint style="info" %}
**Navigation:** Properties > Sections

For detailed parameter explanations, see the [Sections Reference](https://docs.openbrim.org/templates/concrete-u-girder-bridge-workflow/properties-cug/sections-cug).
{% endhint %}

## Step 1: Adding Sections to the Project

### Navigate to Sections

Navigate to **Properties > Sections** in the tree view.

![Navigation](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230824-153950.png?api=v2)

### Import U-Girder Sections

Click the **three-dots icon** on the first cell of Name and select **Import Section**.

Import the following U-girder sections:

| Library Path                                                 | Section Name | Material |
| ------------------------------------------------------------ | ------------ | -------- |
| OpenBrIM Bridge Objects > Precast U Girder Sections > WS DOT | U78G5        | Fc\_6ksi |
| OpenBrIM Bridge Objects > Precast U Girder Sections > WS DOT | U54G5        | Fc\_6ksi |

![Import Section](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230824-154320.png?api=v2)

### Import Basic Shapes

Import basic shapes for substructure sections:

![Basic Shapes](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-083854.png?api=v2)

![Shape Selection](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-084335.png?api=v2)

Create the following sections:

| Section Name | Shape  | Dimensions   | Material |
| ------------ | ------ | ------------ | -------- |
| EBSec        | Square | 42 x 42 in   | Fc\_5ksi |
| PCSec        | Square | 36 x 36 in   | Fc\_5ksi |
| ColSec       | Circle | Radius 18 in | Fc\_6ksi |
| PileSec      | Square | 12 x 12 in   | Fc\_4ksi |

![EBSec](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-084736.png?api=v2)

![ColSec](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-085547.png?api=v2)

![PileSec](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-085753.png?api=v2)

### Create Rigid Section

Add a new row and enter **RigidSection** as the name. Assign **RigidMaterial** to this section.

![Rigid Section](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-104206.png?api=v2)

{% hint style="success" %}
Completed section definitions are shown below.
{% endhint %}

![Completed Sections](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-104410.png?api=v2)

## Step 2: Adding Rebars to Sections

### U78G5 Reinforcement

Click the **three-dots icon** on any cell of the **U78G5** row to open the Section Editor panel.

![Section Editor](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230825-105138.png?api=v2)

Click the **+ icon** and select **Rebar**. Enter the following parameters:

| Parameter              | Value        |
| ---------------------- | ------------ |
| Profile                | ASTMA615No11 |
| Material               | A615\_60     |
| Reference Edge         | Bottom       |
| Dist. to Outer Surface | 1 in         |
| Outer Rebar Spacing    | 5 in         |
| Inner Rebar Spacing    | 5 in         |
| # of Rebars (per Row)  | 10           |
| # of Rows              | 1            |

![U78G5 Rebar](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-085006.png?api=v2)

![U78G5 Complete](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-085048.png?api=v2)

### U54G5 Reinforcement

Open the Section Editor for **U54G5** and add the same reinforcement layout as U78G5.

![U54G5 Editor](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-085301.png?api=v2)

![U54G5 Complete](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-085421.png?api=v2)

### EBSec Reinforcement (End Bent)

Open the Section Editor for **EBSec** and add rebars on all four edges:

![EBSec Editor](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-085928.png?api=v2)

**Top Edge:**

| Parameter              | Value       |
| ---------------------- | ----------- |
| Profile                | ASTMA615No9 |
| Material               | A615\_60    |
| Reference Edge         | Top         |
| Dist. to Outer Surface | 3 in        |
| Spacing                | 4 in        |
| # of Rebars            | 8           |

**Bottom Edge:** Same as Top Edge with Reference Edge = Bottom

**Left Edge:**

| Parameter              | Value       |
| ---------------------- | ----------- |
| Profile                | ASTMA615No9 |
| Material               | A615\_60    |
| Reference Edge         | Left        |
| Dist. to Outer Surface | 2 in        |
| Spacing                | 5 in        |
| # of Rebars            | 6           |

**Right Edge:** Same as Left Edge with Reference Edge = Right

![EBSec Complete](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-090643.png?api=v2)

### PCSec Reinforcement (Pier Cap)

Open the Section Editor for **PCSec** and add rebars on all four edges using the same approach as EBSec, with:

* Top/Bottom: 8 rebars at 4 in spacing, 2 in cover
* Left/Right: 6 rebars at 5 in spacing, 2 in cover

![PCSec Complete](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-091327.png?api=v2)

### ColSec Reinforcement (Column)

Open the Section Editor for **ColSec** and navigate to the **Circular Layout** tab.

![ColSec Editor](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-091651.png?api=v2)

Enter the following parameters:

| Parameter   | Value        |
| ----------- | ------------ |
| Profile     | ASTMA615No11 |
| Material    | A615\_60     |
| Radius 1    | 14 in        |
| Radius 2    | 14 in        |
| # of Rebars | 12           |
| # of Rows   | 1            |

![ColSec Circular](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-091804.png?api=v2)

![ColSec Complete](https://openbrim.atlassian.net/wiki/download/attachments/2258206782/image-20230828-091837.png?api=v2)

## Verification

{% hint style="success" %}
After completing these steps, all sections have their reinforcement defined and are ready for use in the bridge model.
{% endhint %}


---

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