b.
Component design.
A.1 Determine appropriate Seismic Use Group
Because the equipment is not required to be functional after an earthquake, the water pipe bracing is given
a performance level of life safety (LS). The Seismic Use Group and other performance parameters are
determined from Table 4-4, as follows;
Performance Level:
LS
(per problem statement)
Seismic Use Group:
I
(Table 4-4)
Ground Motion:
2/3 MCE (A)
(Table 4-4)
Performance Objective:
1A
(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 = 2/3 SMS = 2/3(1.22) = 0.81g
(EQ. 3-23)
A.7 Bracing system.
The bracing system will consist of structural steel bracing assumed to be installed using low deformability
anchor bolts in concrete. To ensure rigidity, the pipe spans are limited to values shown if Figures 10-6 of
this document.
A.8 Select Rp, ap, and Ip factors.
ap = 1.0
(Table 10-1)
Rp = 1.25
(Table 10-1)
Ip = 1.0
(per paragraph 10-1d)
J3-2
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