# Pier Caps

This section defines the hammerhead pier cap geometry and configuration.

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**Navigation:** Substructure > Pier > Pier Caps

For detailed parameter explanations, see the [Pier Caps Reference](https://docs.openbrim.org/templates/steel-tub-girder-bridge-workflow/substructure-stg/pier-stg/pier-cap-stg).
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## Steps

### Step 1: Navigate to Pier Caps

Navigate to **Pier > Pier Cap** in the tree view.

![Pier Cap navigation](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-140055.png?api=v2)

### Step 2: Assign Support Locations

Click the **three-dot icon** on the **Location** cell and select **Pier2** and **Pier3** support lines.

### Step 3: Configure Section Type

The **Prismatic** section type will be used for all pier caps.

![Section type](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-140749.png?api=v2)

![Pier cap configuration](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-142328.png?api=v2)

![Pier cap details](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-142342.png?api=v2)

### Step 4: Edit Prismatic Section

Click the **three-dot icon** on the **Prismatic Section** cell and select **Edit**.

### Step 5: Define PC1 Sections

For **PC1** (1st Pier Cap):

1. Click the **three-dot icon** on the **Start Section** cell and select **HammerHeadSec**
2. Click the **three-dot icon** on the **End Section** cell and select **HammerHeadSec**
3. Enter **Section Length** as **63** ft along Y-Y (starting from right)

![PC1 section length](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-143052.png?api=v2)

### Step 6: Define PC2 Sections

For **PC2** (2nd Pier Cap):

1. Repeat steps 4-5 using the following sections:
   * First segment: **HalfHammerHeadSec2** (Start and End)
   * Second segment: **HalfHammerHeadSec2** (Start), **HalfHammerHeadSec1** (End)
2. Enter **Section Lengths** as **17** ft and **20** ft along Y-Y (starting from right)

![PC2 sections](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-143917.png?api=v2)

### Step 7: Set Slope Options

Navigate back to the pier cap table and set **Slope Option** as **Alignment**.

![Slope option](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-144454.png?api=v2)

### Step 8: Configure Elevations and Offsets

Enter the following parameters:

| Parameter                                 | Description                    |
| ----------------------------------------- | ------------------------------ |
| Top Elevation Offset from Alignment \[ft] | Vertical offset from alignment |
| Transverse Offset \[ft]                   | Lateral offset from PGL        |

### Step 9: Assign Rigid Section

Navigate to the **FEM** tab and select **RigidSection** for the Rigid Section column.

![FEM settings](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-144648.png?api=v2)

<details>

<summary><strong>Quick Tip:</strong> Transverse Offset Direction</summary>

Offset values use PGL (Project Geometry Line) as the reference point.

![Offset reference](https://openbrim.atlassian.net/wiki/download/attachments/2104689432/image-20230216-130246.png?api=v2)

</details>

## Verification

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The completed pier caps are shown below.
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![Pier caps 3D view](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-144938.png?api=v2)

![Pier caps side view](https://openbrim.atlassian.net/wiki/download/attachments/2169143329/image-20230221-144916.png?api=v2)