- Access
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- Click Loads
Load Definition Node tab 
Imposed Displacement.
- Click Loads
Use this dialog to specify imposed displacements for structure support nodes.
- U
- Defines the displacement along the X, Y, or Z axis of the coordinate system.
- R
- Defines the rotation around the X, Y, or Z axis of the coordinate system.
- Load treated as
- Specifies if the load should be treated as a displacement, a velocity, or an acceleration. Note: The imposed velocity or acceleration on a supported node can be used in the time history analysis only; this type of load has no effect in the static analysis.