Journal of Seismology and Earthquake Engineering

Journal of Seismology and Earthquake Engineering

Fragility Curve Development for Assessing Midrise Steel Building with Buckling Resistant Braced System Having Vertical Irregularity

Document Type : Research Note

Authors
Hamzeh Shakib
Mehdi Nodeh
Farshad Homaei
Tarbiat Modares University
10.48303/jsee.2015.240726
Abstract
In this paper, the fragility curves have been developed for assessing vertically irregular midrise steel building with Buckling Resistant Braced (BRB) system. The effect of different vertical irregularities of mass, stiffness and the concurrent variation of stiffness and strength was investigated in the seismic response of a ten-story steel building. The fragility curves of both the regular and irregular structures were developed through the incremental dynamic analysis and the effects of vertical irregularities were evaluated in the seismic performance of the structure. Fragility curves show that among all the vertical irregularities, variation in the mass has little effect on the probability exceedance of demand from capacity. Meanwhile, the concurrent variation of stiffness and strength shows a significant increase in the probability exceedance of demand from capacity, especially through the nonlinear phase of structural behavior, through the collapse prevention to the global instability limit states.
Keywords
Fragility Curve
Buckling resistance brace
Vertical irregularity
Incremental Dynamic Analysis
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Journal of Seismology and Earthquake Engineering
Volume 17, Issue 4 - Serial Number 4
Autumn 2015
Pages 293-304

  • Receive Date 22 August 2015
  • Accept Date 26 December 2020
  • Publish Date 01 October 2015