In a random-vibration (PSD/ASD) analysis, why do one-sigma displacements change when element results are requested, as this should not have anything to do with the displacements.

Your database may contain material-dependent damping, which is only used when element results are requested because the damping is proportioned to the different materials based on the element quantity strain energy. Consequently, a run with element results requested is more-heavily damped and produces smaller displacements.

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