For Response Spectrum Analysis, yes you can feed multiple impulses into the DLF generator. Note that the resulting DLF will contain values greater than 2.0, which is the limit for a <em>single</em> impulse.

You can see the resulting DLF graphically if you're running Version 4.20. This version plots the DLF next to the DLF table values.

For Time History Analysis, you can define any (multiple shaped) pulse you want.

Richard Ay (COADE, Inc.)
Richard Ay