Define Spectrum Details tab
Used to define the response spectrum according to FEMA 356.
|Critical Damping (%) 1st | 2nd | 3rd | 4th Spectrum||
Specify critical damping ratios to be used for the first (required, 0.05 is the default) through the fourth spectra.
Specify the site category which describes the soil conditions.
|At Short Period||
Specify the mapped spectral acceleration at short period, Ss.
|At One-Second Period||
Specify the mapped spectral acceleration at one-second period, S1.