1-in = 25.4mm
1-ft = 0.30m
1plf = 14.58KN/m
Figure J2-2. Platform framing plan
c.
Component design.
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;
Performance Level:
IO
(per problem statement)
Seismic Use Group:
IIIE
(Table 4-4)
Ground Motion:
3/4 MCE (B)
(Table 4-4)
Performance Objective:
3B
(Table 4-4)
A.2 Determine site seismicity.
The following values are assumed for this example:
SS = 1.20g
(MCE Maps)
A.3 Determine site characteristics.
Soil type D is assumed for this problem
Soil type: D
(Table 3-1)
A.4 Determine site coefficients.
Fa = 1.02
(interpolated)
(Table 3.2a)
A.5 Determine adjusted MCE spectral response accelerations.
SMS = FaSS = 1.02(1.20)g = 1.22g
(EQ. 3-1)
A.6 Determine design spectral response accelerations.
SDS = 3/4 SMS = 3/4(1.22) = 0.92g
(EQ. 3-3)
J2-2
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