Reply To: Damping in Response Spectrum Analysis

[Chandra Sekaran]

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You will need to use APDL commands to input multiple curves with different damping ratios and to specify the damping ratio for each mode

The spec I am using provides SRS curves for many damping values. How would I choose which to use?

You should input all the spectral curves along with their damping ratio values using SV,damp,sv1,sv2,...  Refer to FREQ and SV commands to understand the format.

I am performing a response spectrum analysis on a system with many modes, each with it's own damping ratio. 

You can use MDAMP command to input the damping of each natural frequency