Foundations - Chapter 9.

(e)

For some components it is

convenient to prescribe acceptance criteria in terms

Nonstructural Systems and Components

of deformation (e.g., 2 or )), while for others it is

more convenient to give criteria in terms of

Chapter 10.

deformation ratios. To accommodate this, two types

of idealized force versus deformation curves are used

Acceptance criteria for elements and components for

in this procedure as illustrated in Figures 6-2a and 6-

which criteria are not presented in this document

Figure 6-2a shows normalized force (*Q*/*Q*CE)

2b.

shall be determined by an approved qualification-

versus deformation (or )) and the parameters a, b,

testing program.

and c. Figure 6-2b shows normalized force (*Q*/*Q*CE)

versus deformation ratio (2/2y, )/)y or )/h) and the

Pseudo-lateral load, *V*, in a given

(2)

parameters d, e, and c. Elastic stiffness and values

horizontal direction of a building, is given by

for the parameters a, b, c, d, and e that can be used

Equation 6-1. This load shall be used for the design

for modeling components for various structural

of the vertical seismic framing system when the

systems are given in Chapter 7.

Figure 6-2c

linear elastic analysis procedures are used with the *m*

graphically shows the approximate deformation or

values.

deformation ratio, in relation to the idealized force

versus deformation curve, that is deemed acceptable

(6-1)

in this procedure for structural components for

Immediate Occupancy (IO), Safe Egress (SE), and

where:

Life Safety (LS), Performance Levels. The Collapse

Prevention (CP) performance level indicated in

distributed over the height of the linearly elastic

Figure 6-2c is not an acceptable performance level,

model of the building, is intended to produce

and is indicated here and in the acceptance criteria

calculated lateral displacements approximately equal

tables in Chapter 7 as a limit state for ductile

to those that are expected in the real structure during

response.

Numerical values of the acceptable

the design event. If it is expected that the actual

deformations or deformation ratios are given in

structure will yield during the design event, the force

Chapter 7 for components and elements in various

given by Equation 6-1 may be significantly larger

structural systems.

Additional guidelines on the

than the actual strength of the structure to resist that

calculation of individual component force and

force.

The acceptance criteria in the following

deformation capacities may be found in the following

paragraph are developed to take this aspect into

chapters.

account.

Base

isolation

systems

and

energy

dissipation systems - Chapter 8.

5-4f(2).

6-6

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