Step
Procedure
TI-809-04
Locate δon Base Shear vs. Roof Displacement plot.
13.
t
If δis beyond effective portion of the plot, significant strengthening of the
a.
t
yielding elements may be required.
If δis within the effective portion of the plot, check interstory drift and P∆
b.
t
effects. If allowable limits have been exceeded, stiffening of yielding elements
may be required.
para. 5-4f(1)(i)
If interstory drift and P∆ effects are acceptable, check inelastic responses of
c.
yielding elements against acceptance criteria.
14.
If evaluations in Step 13 are negative, mathematical model must be strengthened
and/or stiffened and the analyses repeated. Available computer programs can perform
Steps 1 to 8 above, including P∆ effects. For a given building displacement,
maximum inelastic responses (∆/∆y or chord rotations) are developed which can be
checked against the acceptance criteria.
para. 6-3b
Chapter 7 provides acceptance criteria for the nonlinear response (∆/∆y or chord
Chapters 5 and 7
rotations) for the structural components of various structural systems. Acceptance
values are provided for Life Safety, Safe Egress, and Immediate Occupancy.
Table 4-7 Step-by-Step Procedure for Enhanced Performance Objective
with Nonlinear Elastic Static Analysis
Sheet 2 of 2
4-19
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