Add Rotation Restraint

The Add Rotation Restraint option allows you to specify a clamped condition (zero rotation) for a point on a liner. This allows you to model clamped conditions at the end of a beam, for example, as shown in the following figure.

Beam clamped at both ends

NOTE: Liner Rotation Restraints can only be applied if the finite element mesh exists, and at least one liner has been applied to a boundary. Otherwise the Rotation Restraint option will not be available.

To add a liner rotation restraint:

1. Select Add Rotation Restraint from the Liner Moments sub-menu of the Loading menu.
2. Staging:
3. • If your model is multi-stage, you will see the Add Rotation Restraint dialog, which allows you to specify the installation stage of the Rotation Restraint(s). You can also specify a removal stage, by selecting the Remove at stage check box and entering the stage at which the Rotation Restraint(s) are to be removed (uninstalled). select [OK] when you have specified the staging information.
   • If your model is single stage, you will not see the Add Rotation Restraint dialog, proceed directly to Step 3.
4. Use the mouse to select the node(s) on which to apply a Liner Rotation Restraint. When nodes are selected, they will be highlighted by a small circle.

NOTE: you cannot add a Liner Rotation Restraint unless a Liner exists at that location on the boundary.

5. When you are finished selecting, press Enter or right-click and select Done Selection. The Rotation Restraint(s) will be applied to all selected nodes, as you will see by a square symbol with a dot inside, at each node.

NOTE: if you specified installation and/or removal stages in the Add Rotation Restraint dialog, the restraints are only displayed at stages where they exist (i.e. a Rotation Restraint will NOT be displayed if the viewed stage is LESS THAN the installation stage or GREATER THAN OR EQUAL TO the removal stage).