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;
(per problem statement)
Seismic Use Group:
2/3 MCE (A)
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 = 2/3 SMS = 2/3(1.22) = 0.81g
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
A.8 Select Rp, ap, and Ip factors.
ap = 1.0
Rp = 1.25
Ip = 1.0
(per paragraph 10-1d)