A.7 Determine Seismic Design Category
From Tables 4-2a and 4-2b for the Seismic Use Group and design spectral response accelerations:
Seismic Design Category = D
Table 4-2a
Seismic Design Category = D
Table 4-2b
A.8 Select structural system
(See discussion of structural systems in the building description section).
A.9 Select R, Ω o & Cd factors.
Transverse (North-South): Building Frame System with Special reinforced masonry shear walls. The
building is assumed to act as a frame system rather than a bearing wall system. The beams that support
the mezzanine deck bear on pilasters that project from the exterior and interior CMU shear walls. The
pilasters are considered to act as a part of the gravity system and are neglected for lateral force resistance.
R=
5
Ωo =
2.5
Table 7-1
Cd =
4
Longitudinal (East-West): Building frame system with ordinary steel concentrically braced frames.
R=
5
Ωo =
2.0
Table 7-1
Cd =
4.5
H1-7
Previous Page
