QCL
=
lower-bound
strength
of
a
QE
= QG
QUF
(6-4b)
component or element at the deformation level under
C1C2C3
consideration for force-controlled actions.
where:
For QCL, the lower-bound strength shall be
determined considering all co-existing actions acting
QUF = design actions due to gravity loads
on the component under the design loading
and earthquake loads.
condition. In this document, QCL is defined as the
nominal strength QN multiplied by the appropriate
C1C2C3 =
coefficients as defined in
capacity reduction factor, N, unless otherwise noted
Paragraph 5-4f.
in Chapters 7 through 10.
J = a force-delivery reduction factor given
(3) Nonstructural components. As indicated
by Equation 6-5.
in Paragraph 4-12, the minimum performance
objective for all nonstructural components will be
The coefficient J shall be established using Equation
similar to structural Performance Objective 1A, and
6-5:
the acceptance criteria are satisfied by compliance
with Chapter 6 of FEMA 301 with a component
J = 1.0 + SDS, not to exceed 2
(6-5)
importance factor of 1.0.
Selected nonstructural
components shall be assigned component importance
where:
factors, in accordance with Paragraph 10-1d,
regardless of the structural performance objectives of
SDS =
spectral acceleration, described in
the building.
Chapter 3.
b.
Nonlinear Static Procedure.
Equation 6-4b can be used in all cases. Equation 6-
4a can only be used if the forces contributing to QUF
(1) General. This procedure shall be used for
are delivered by yielding components of the seismic
the evaluation of structures in Seismic Use Groups II
framing system. Force-controlled actions in primary
and III, with the characteristics described in
and secondary components and elements shall satisfy
Paragraph 5-4b.
Acceptance criteria are also
Equation 6-6.
provided for this procedure to satisfy Performance
Objective 1A, but the use of this procedure for that
QCL $ QU
(6-6)
performance objective requires specific authorization
from the cognizant design authority.
where:
6-9
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