A Nonlinear Analysis Method for Performance-Based Seismic Design
By P. Fajfar. 2000
870 citations recorded by the source corpus.
A relatively simple nonlinear method for the seismic analysis of structures (the N2 method) is presented. It combines the pushover analysis of a multi-degree-of-freedom (MDOF) model with the response spectrum analysis of an equivalent single-degree-of-freedom (SDOF) system. The method is formulated in the acceleration-displacement format, which enables the visual interpretation of the procedure and of the relations between the basic quantities controlling the seismic response. Inelastic spectra, rather than elastic spectra with equivalent damping and period, are applied. This feature represents the major difference with respect to the capacity spectrum method. Moreover, demand quantities can be obtained without iteration. Generally, the results of the N2 method are reasonably accurate, provided that the structure oscillates predominantly in the first mode. Some additional limitations apply. In the paper, the method is described and discussed, and it basic derivations are given. The similarities and differences between the proposed method and the FEMA 273 and ATC 40 nonlinear static analysis procedures are discussed. Application of the method is illustrated by means of an example.
Subfields: Building and Construction, Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/3c0950d7db33e46e4f6c1ecc55483247cf877f1f
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In Building and Construction
In Civil and Structural Engineering
Citations in the corpus
- Simplified method for seismic risk assessment of buildings with consideration of aleatory and epistemic uncertainty (2011, methodology): “For example, Fajfar ( 2000 ) proposed the simplified non-linear method, known as the N2 method, which combines non-linear static pushover with inelastic spectra, and is implemented in Eurocode 8 (CEN 2004a ).”