CHAPTER 7
experts. Future modification of these values should
STRUCTURE SYSTEMS
be expected as they are tested by analytical case
AND COMPONENTS
studies and actual earthquakes. Alternative values,
derived from test data in the literature or performed
7-1.
General.
on a project-specific basis, may be used in lieu of the
tabulated values, subject to the approval of the
proponent agency.
This chapter provides acceptance criteria applicable
to structural systems for the design of military
m factor tables.
(1)
Tables of numerical
buildings.
Advantages and disadvantages of each
acceptance criteria for linear procedures (m factors)
system are discussed, and pertinent detailing
are provided in this chapter for various deformation-
provisions are provided and illustrated with typical
controlled components and elements of structural
details.
Alternative structural systems, other than
systems. The columns in the left-hand side of the
those described in this chapter, should not be used in
tables refer to the applicable condition of the
the design of military buildings without specific
component or element, and the columns on the right
approval from the proponent agency.
list the appropriate m factor for the following
a.
Design for Life Safety. As indicated in
performance levels:
Chapter 4, all buildings will be designed to protect
IO = immediate occupancy
life safety (Performance Objective 1A). Following
the selection of the appropriate Seismic Use Group,
SE = safe egress
Seismic Design Category, and analytical procedures,
the design of the building is performed in accordance
LS = life safety
with the provisions of FEMA 302. Table 5.2.2 of
"Design Coefficients and Factors of Basic Seismic-
CP = collapse prevention.
Force-Resisting Systems" is reproduced in this
document as Table 7-1 for ease of reference.
The performance levels are defined in Table 4-3, and
b.
Enhanced Performance Objectives. Chapter
their physical significance is indicated in Figures 6-1
and 6-2.
4 prescribes the minimum analytical procedures for
the enhanced performance objectives (Performance
(2) Nonlinear acceptance criteria. Tables of
Objectives
2A,
2B,
and
3B);
the
analytical
modeling parameters and numerical acceptance
procedures are discussed in Chapter 5; and numerical
criteria for nonlinear procedures are provided for the
values for the acceptance criteria prescribed in
same components and elements and in the same
Chapter 6 are provided in this chapter for various
format as in the m factor tables for linear procedures.
components of each structural systems.
These
values, modified from tables in FEMA 273, represent
the current state of the art as defined by panels of
7-1
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