Mechanical APDL Structural Analysis Guide

! procedure, the default significance

! threshold is 0.01 and element results are! requested

solve

finish

! Perform a DDAM spectrum analysis (Combination Step)

/solu

antype, SPECTRUM

spopt, DDAM! DDAM Spectrum analysis

nrls,...! NRLSUM mode combination

dmprat,...! Define damping ratio

solve

finish

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