Advances in Seismic Design Methodologies - Earthquake Engineering for Structural Design - page 423

Advances in Seismic Design Methodologies 423

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(a)

(b)
Figure 9.24 Steps in response spectrum analysis: (a) Computation of mode shapes
and periods; (b) Reading the response spectrum (after ESDEP, 2008)

9.5.5Non-linearStaticAnalysis:Push-overMethod

Due to the development in computing programs, the current engineering practice for
seismic analysis of buildings is moving away from simplified linear-elastic methods of
analysis towards a more complex non-linear-inelastic technique. The non-linear static
(push-over) analysis is a simple way to evaluate the inelastic ultimate capacity of
structures. In this method, the designed structure is subjected to incremental lateral
loads, using one or more predominant load patterns. Under incremental loads, various
structural members may yield sequentially. Consequently, at each load level, the