Description: When performing a response spectrum analysis, you must first convert the dynamic event into a spectrum. Abaqus/Standard allows you to create a spectrum automatically from a given dynamic event that is supplied in the form of a user-defined time domain amplitude record. You can build a displacement, velocity, or acceleration spectrum for a number of provided damping values. The spectrum that you create can be used in a subsequent response spectrum analysis or it can be written to an external file for future use.