1-in = 25.4mm
1-ft = 0.30m
1plf = 14.58KN/m
A.1 Determine appropriate Seismic Use Group
It is decided that the building supporting the tank be functional after an earthquake, therefore the tank is
given a performance level of immediate occupancy (IO). The Seismic Use Group and other performance
parameters are determined from Table 4-4, as follows;
(per problem statement)
Seismic Use Group:
3/4 MCE (B)
A.2 Determine site seismicity.
The following values are assumed for this example:
SS = 1.20g
A.3 Determine site characteristics.
Soil type D is assumed for this problem
Soil type: D
A.4 Determine site coefficients.
Fa = 1.02
SMS = FaSS = 1.02(1.20)g = 1.22g
SDS = 3/4 SMS = 3/4(1.22) = 0.92g