Assessment of improved modal pushover analysis for eccentrically braced frames

Kazemi Amiri, A. and Vaseghi Amiri, J. and Abdollah Zadeh, Gh. (2010) Assessment of improved modal pushover analysis for eccentrically braced frames. In: 14th European Conference on Earthquake Engineering, 2010-08-30 - 2010-09-03.

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    Abstract

    This paper concentrates on evaluation of current Pushover Procedures to assess the seismic demands of Eccentrically Braced Frame (EBF). Three 5, 10 and 15 storey EBF frames, designed by Iranian codes, analyzed for five ground motions by MPA, IMPA, and as a proposed method MPA based on Energy-Based capacity curve (briefly E-B.MPA), also story drift of frames were estimated by conventional pushover using two Load distributions of FEMA-356, ELF and uniform patterns. It was considered, the 10 and 15 storey frames have reversal capacity curves, therefore the pushover curve of another story (not roof) was plotted to perform MPA but E-B.MPA was done with no difficulty. Comparing the responses of procedures with the results of Nonlinear Time History Analysis (NTHA) demonstrates that MPA.E-B determines drift demands of models with reversal capacity curves more accurate than other procedures. Moreover there are serious concerns about estimated drift demands of two load patterns.

    ORCID iDs

    Kazemi Amiri, A. ORCID logoORCID: https://orcid.org/0000-0002-6741-9274, Vaseghi Amiri, J. and Abdollah Zadeh, Gh.;