D. Performance Objective 2A (Safe Egress for Special Occupancy)
(See Flow Chart in Figure 4-2)
This performance objective utilizes the same basic ground motion as the Life Safety Performance Objective (1A). For one-
or two-story buildings that have been analyzed by the ELF procedure or for buildings that have been subjected to a 3-D
modal analysis procedure, the seismic effects, QE, in step B10 of Table 4-5 may be
scaled to the appropriate values as indicated in Step 3 below.
Determine pseudo lateral load V=C1 C2 C3 SaW.
Determine seismic effects (Seismic effects in Steps B-4 through B-9 in Table 4-5 may be
Steps B-4 through B-9 in
scaled by the factor R x C1 x C2 x C3.)
Determine the combined load effects.
and Eq. 6-2
Identify force-controlled and deformation-controlled structural components.
Determine QUD and QCE for deformation-controlled components.
Chapter 7 and
Determine DCR' for deformation-controlled components and compare with allowable m
Chapter 7 and
values for Safe Egress.
Determine QUF and QCL for force-controlled components and compare QUF with QCL.
Eq. 6-4a and 6-4b
and Chapter 7
Revise member sizes, as necessary, and repeat analysis.
E. Performance Objective 2B (Safe Egress for Hazardous Occupancy)
(See Flow Chart in Figure 4-3)
Same as Performance Objective 2A above, except that Ground Motion B (3/4 MCE) is to be used . As indicated above, if a
suitable analyses has been performed for Performance Objective 1A, the seismic effects may be scaled by R x C1 x C2 x C3
x 0.75/0.67. The m values for Safe Egress are applicable.
F. Performance Objective 3B (Immediate Occupancy for an Essential Facility)
Same as Performance Objective 2B, except that the m values for Immediate Occupancy are applicable.
Table 4-6 Step-by-Step Procedures for Enhanced Performance Objectives
with Linear Elastic Analyses Using m Factors