Assessment of improved modal pushover analysis for eccentrically braced frames

A. Kazemi Amiri, J. Vaseghi Amiri, Gh. Abdollah Zadeh

Research output: Contribution to conferenceProceedingpeer-review

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.
Original languageEnglish
Number of pages8
Publication statusPublished - 30 Aug 2010
Event14th European Conference on Earthquake Engineering - Ohrid, Macedonia, The Former Yugoslav Republic of
Duration: 30 Aug 20103 Sep 2010

Conference

Conference14th European Conference on Earthquake Engineering
CountryMacedonia, The Former Yugoslav Republic of
CityOhrid
Period30/08/103/09/10

Keywords

  • pushover procedures
  • Eccentrically Braced Frame (EBF)
  • ground motions
  • reversal capacity curve
  • E-B.MPA
  • earthquake loads

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