Define Spectrum Details tab
Used to define the response spectrum according to FEMA 356.
| Setting | Description |
|---|---|
| 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. |
| Site Category |
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. |