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Five-percent damped design spectral response acceleration at short periods, SDS, and at 1-second period, SD1, are evaluated using the equations 16-39 and 16-40, respectively:
•SDS = (2÷3) SMS = (2÷3) FaSS .......... Eq. 16-39
•SD1 = (2÷3) SM1 = (2÷3) FvS1 .......... Eq. 16-40
QuakeManager refers to tables 1613.3.3(1) and 1613.3.3(2) to obtain the Site Coefficients Fa and Fv and interpolates automatically in case values fall between a range.
Table: Site Coefficient Fa (IBC 2012)
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Table: Site Coefficient Fv (IBC 2012)
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