determined
in
accordance
with
FEMA
302,
includingthe N factor.
g.
Horizontal Bracing.
(1) General. Diaphragms may be made of
horizontal steel bracing.
Usually, the bracing
consists of members added to the top or bottom plane
of a system of floor or roof trusses or beams.
Transverse elements are added for components
perpendicular to the trusses or beams, and diagonal
members are added to form a triangulated plane of
bracing.
(2) Acceptance criteria.
(a) Response modification factors, R, for
horizontal bracing in buildings conforming to
Performance Objective 1A will be based on the
factors for the applicable structural systems in Table
7-1.
Bracing members and connections will be
designed as prescribed for vertical steel concentric
braced frames in Paragraph 7-3b.
(b) Modification factors, m, for enhanced
performance objectives and modeling parameters and
numerical acceptance criteria shall be as prescribed
for concentric steel braced frames in Paragraph 7-
3b(9).
(c)
Expected strength for deformation-
controlled components and lower-bound strength for
force-controlled
components
shall
also
be
as
prescribed for concentric braced frames in Paragraph
7-3b(9).
7 -155
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