Load Case Data - Response Spectrum

The Load Case Data - Response Spectrum form is used to view and change the definition of a response-spectrum analysis case. Click the Analysis >  Type > Response Spectrum > New command to display the Load Case Data - Response Spectrum form.

Note: If a modal analysis case has not yet been defined, first define the modal analysis case and then define the response-spectrum case.

Tip: Most commonly, only one modal load case will have been defined, and its name will already be selected by default.

      • Coordinate System drop-down list. Specify a coordinate system in which the acceleration directions are measured. See Applying Acceleration Loads for more information.

Important: All accelerations should use the same coordinate system.

      • Angle edit box.  Specify an angle by which U1 and U2 are rotated from UX and UY in the specified coordinate system. See Applying Acceleration Loads for more information.

Important: Accelerations U1 and U2 should use the same angle. The angle is not used for direction U3.

See Also

Load Case Data

Define Load Cases

Define Response-Spectrum Functions