> 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/templates/steel-tub-girder-bridge-workflow/loading-stg/loads-stg/element-loads-stg/girder-load-stg.md).

# Girder Load \[STG]

## Girder Load

Girder loads can be defined based on the selected girder, construction stage, applied flange, and magnitudes in terms of forces and moments.

**Girder**: Select the girder to which the load will be applied.

**Stage:** Choose the stage at which to apply the load.

**Applied Flange \[Top Left Flange/Top Right Flange/ Both Top Flanges/ Bottom Flange]:** Specify the flange as either the top left/right or bottom using this parameter. If both flanges are selected, there is no need to increase the load by 2×, since the entered load will already be applied to both the left and right top flanges.

**Fx :** Force in the longitudinal direction along the PGL.

**Fy :** Force in the direction perpendicular to the PGL.

**Fz (Gravity):** Force in the vertical direction. A positive value indicates a load in the global -Z or gravity direction. For usual loads (wearing surface loads - stay-in-place formwork loads), the user should input positive values.

**Mx :** Moment in the longitudinal direction along the PGL.

**My :** Moment in the direction perpendicular to the PGL.

**Mz :** Moment in the vertical direction.

{% hint style="info" %}
**The Directions of Forces** See the figures provided below for further clarification on the directions of positive forces. The figures below are taken from the start station of the bridge model. ![image-20241215-085812.png](https://openbrim.atlassian.net/wiki/download/attachments/2348580901/image-20241215-085812.png?api=v2) ![image-20241215-085935.png](https://openbrim.atlassian.net/wiki/download/attachments/2348580901/image-20241215-085935.png?api=v2) ![image-20241215-090037.png](https://openbrim.atlassian.net/wiki/download/attachments/2348580901/image-20241215-090037.png?api=v2)
{% endhint %}


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