# Steel I Girder - Additional Bearing Construction and Deconstruction

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Follow the steps below to construct and deconstruct temporary bearings on a steel I-girder model.
{% endhint %}

This article walks through adding temporary bearings on the steel I-girder model shown below. Two extra supports are added at the 25 ft and 75 ft stations of the 100 ft girder. The construction is staged in three steps.

![image-20250528-121938.png](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-121938.png?api=v2)

1. Create the additional support lines.

   ![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-122209.png?api=v2)
2. Create additional insertion points on the new support lines. The insertion points could also be added to existing support lines using a longitudinal offset, but a new support line is usually easier to manage — it avoids confusion about which station an offset insertion point belongs to.

   ![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-122434.png?api=v2)
3. Include the new insertion points in the girder layout. This step aligns each insertion point's elevation with the bottom of the girder.

   ![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-122659.png?api=v2)
4. Define bearing fixity for the new insertion points.

   ![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-122934.png?api=v2)
5. Construct the bearings stage by stage under **Bearing Construction**.

   ![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-123114.png?api=v2)
6. Select the additional bearings to be removed under **Bearing Deconstruction**.

   ![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/image-20250528-123253.png?api=v2)

Animation of the resulting deformation across construction stages:

![](https://openbrim.atlassian.net/wiki/download/attachments/3134488607/I%20girder%20deformation.gif?api=v2)


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