RAM Frame evaluates the centers of rigidity for a structure using a stiffness approach. The center of rigidity of a level is defined as a point at which a lateral load applied at its locus produces no rotation at this particular level.

To define a Center of Rigidity Load Case, go to the Load Cases dialog box, define a Label and click on the "Center of Rigidity" button. The load case is automatically created.

Click the OK button to save this load case. Click Cancel to return to the previous dialog box without saving this load case.