Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

Modal pushover analysis as a tool for evaluation and design of irregular frames

D.G. Lignosa,*, C.J. Gantesb
aStanford University, Civil and Environmental Engineering Department, Stanford, CA 94305-4020, USA bNational Technical University of Athens, Civil Engineering School, 9 Iroon Polytechneious Str. Athens, GR-15780, Greece
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ABSTRACT
This paper investigates the application of modal pushover analysis (MPA) as a tool to estimate seismic demands of structures with irregular mass distribution. A set of 20 ground motions is selected and median peak values of interstory drift ratios, story shears and overturning moments obtained with MPA are compared with results of nonlinear time history analysis (NL-THA). It is concluded that modal pushover analysis can be used to estimate seismic demands for practical applications in evaluation and design of frames with mass irregularity.

Keywords:  Modal pushover; Mass irregularity; Pushover analysis; Nonlinear time history analysis; Higher modes; Incremental dynamic analysis; Seismic response
* Corresponding author. Tel.: +1 (650) 723 1502; Fax: +1 (650) 723 7514; E-mail: dlignos@stanford.edu