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Fa = Short-Period Site Coefficient
Fv = Long-Period Site Coefficient for a period of 1.0 seconds
SMS = Short-period design spectral response acceleration parameter [dimensionless]
SM1 = Design spectral response acceleration parameter for a period of 1.0 seconds [dimensionless]
SS = the mapped MCER spectral response acceleration parameter at short periods as determined in accordance with Section 11.4.2,
S1 = the mapped MCER spectral response acceleration parameter at a period of 1 s as determined in accordance with Section 11.4.2
SD1 = Design spectral response acceleration parameter for a period of 1.0 seconds
SDS = Design earthquake spectral response acceleration parameters at short periods
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Site Coefficients
According to In ASCE 7-16 Table 20.3-1,the soil class is determined according to the top 100 ft (30 m) of the soil profile. It has been defined as six classes, from A to F according to Table 20.3-1.
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Site Class | S1 ≤ 0.25 | S1 = 0.2 | S1 = 0.3 | S1 = 0.4 | S1 = 0.5 | S1 ≥ 0.6 |
|---|---|---|---|---|---|---|
A | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
B | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
C | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.4 |
D | 2.4 | 2.2 | 2.0 | 1.9 | 1.8 | 1.7 |
E | 4.2 | |||||
F | ||||||
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