# Bearing Fixity

This section defines bearing restraints at each support location.

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**Navigation:** Superstructure > Boundary Conditions > Bearing Fixity
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## Steps

### Step 1: Navigate to Bearing Fixity

Navigate to **Superstructure > Boundary Conditions > Bearing Fixity** in the tree view.

![Bearing Fixity navigation](https://openbrim.atlassian.net/wiki/download/attachments/2169110536/image-20230217-164537.png?api=v2)

### Step 2: Select Insertion Points

Click the first cell in the **Insertion Point** column and click **Pick** to select support locations.

![Pick insertion points](https://openbrim.atlassian.net/wiki/download/attachments/2169110536/image-20230217-164723.png?api=v2)

### Step 3: Define Fixities

Set **Tx/Ty/Tz/Rx/Ry/Rz** values for each bearing based on bearing type.

![Fixity values](https://openbrim.atlassian.net/wiki/download/attachments/2169110536/image-20230217-165440.png?api=v2)

### Step 4: Configure Load Transfer

* Set **Transfer Force to Substructure** = **Yes** for interior pier locations
* Set **Transfer Force to Substructure** = **No** for abutment locations

<details>

<summary><strong>Quick Tip:</strong> Coordinate System</summary>

DOFs are assigned based on the local coordinate system at each insertion point, which changes along the support line and alignment. The **Bearing Rotation** parameter rotates the support clockwise in the XY plane.

</details>

## Verification

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The completed bearing fixity configuration is shown below.
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![Completed bearing fixity](https://openbrim.atlassian.net/wiki/download/attachments/2169110536/image-20230217-165802.png?api=v2)