Thank you Harshvardhan for the link to the KM.
It seems there are two places to include damping.
(1) When converting a time history into a Response Spectrum, damping can be included in the spectrum using damping RATIO, see slide 11 in Response Spectrum. In this example, that is left blank, but it could have a value such as 0.05.
(2) When defining the Analysis Settings in the Modal part of Response Spectrum Analysis, Constant Damping Ratio is shown on slide 9.
If a non-zero damping RATIO is specified in the creation of the Response Spectrum and damping is also in the Modal analysis, they would both be applied resulting in excessive damping in the Response Spectrum analysis results. Damping should only be included in one place or the other, not both. Is that correct?
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