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Determine appropriate Seismic Use Group

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c.
Component design.
A.1 Determine appropriate Seismic Use Group
Due to the requirement that the building be functional after and earthquake, the partition 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 = 0.80g
(MCE Maps)
A.3 Determine site characteristics.
Soil type C is assumed for this problem
Soil type:  C
(Table 3-1)
A.4 Determine site coefficients.
Fa = 1.08
(Table 3-2a)
A.5 Determine adjusted MCE spectral response accelerations.
SMS = FaSS = 1.08(0.80)g = 0.86g
(EQ. 3-1)
A.6 Determine design spectral response accelerations.
SDS = 3/4 SMS = 3/4(0.86) = 0.65g
(EQ. 3-3)
A.7 Bracing system.
Brace partitions with steel angles on each side. Angles to be bolted to 2nd floor concrete slab as indicated in
Figure I2-2.
A.8 Select Rp, ap, and Ip factors.
ap = 2.5
(Table 10-1)
Rp = 2.5
(Table 10-1)
Ip = 1.5
(per Paragraph 10-1d)
A.10 Determine member sizes for gravity load effects.
No gravity load design is required.
Note: Table 4-6 was created as an aid for building design and is not entirely applicable in the design of
nonstructural systems and components. The following steps are based on the intent of this document, and
do not have a one to one correspondence to steps as listed in Table 4-6.
I2-3


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