> 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/steel-bridge-examples/example-steel-tub-girder-bridge-ex1-stg/loading-ex1-stg/loads-ex1-stg/surface-load-ex1-stg.md).

# Surface Load

This section defines surface loads for wearing surface and formwork.

{% hint style="info" %}
**Navigation:** Loading > Loads > Surface Load
{% endhint %}

## Steps

### Step 1: Define Load Surface Geometry

Navigate to **Load Geometry Definitions > Surface > Quadrilateral** in the tree view.

![Quadrilateral navigation](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-122501.png?api=v2)

Click the **three-dot icon** on the **Bridge** cell and set **BRG1**.

Enter surface dimensions:

* Start Station \[ft]: **0**
* End Station \[ft]: **520**
* Surface Width \[ft]: **36**

![Surface dimensions](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-123158.png?api=v2)

### Step 2: Define Surface Loads

Navigate to **Loads > Surface Load**.

![Surface Load navigation](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-123742.png?api=v2)

![Surface Load table](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-125906.png?api=v2)

Click the **three-dot icon** in the **Surface** cell and set **LS1** to identify the construction stages that have a surface load.

### Step 3: Assign Construction Stages

Click the **three-dot icon** on the **Stage** cell and assign stages:

* FutureWearLoad: **FutureWearingStage**
* SIPLoadLeft: **SIPFormworkStage**
* SIPLoadRight: **SIPFormworkStage**

![Stage assignment](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-130140.png?api=v2)

![Stage details](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-131254.png?api=v2)

### Step 4: Enter Load Magnitudes

Enter the magnitudes of the surface loads to be applied.

![Load magnitudes](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-132527.png?api=v2)

### Step 5: Set Element Stage

Set the Element's stage, which indicates which surface load will be applied to each surface.

![Element stage](https://openbrim.atlassian.net/wiki/download/attachments/2169798657/image-20230223-133038.png?api=v2)

## Verification

{% hint style="success" %}
All surface loads should be properly defined with appropriate stages and magnitudes.
{% endhint %}


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