Structural Engineering and Mechanics

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A new optimized performance-based methodology for seismic collapse capacity assessment of moment resisting frames

  • Maddah, Mohammad M. (Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES)) ;
  • Eshghi, Sassan (Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES)) ;
  • Garakaninezhad, Alireza (Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES))
  • Received : 2021.05.25
  • Accepted : 2022.03.16
  • Published : 2022.06.10
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Abstract

Moment-resisting frames (MRFs) are among the most conventional steel structures for mid-rise buildings in many earthquake-prone cities. Here, a simplified performance-based methodology is proposed for the seismic collapse capacity assessment of these buildings. This method employs a novel multi-mode pushover analysis to determine the engineering demand parameters (EDPs) of the regular steel MRFs up to the collapse prevention (CP) performance level. The modal combination coefficients used in the proposed pushover analysis, are obtained from two metaheuristic optimization algorithms and a fitting procedure. The design variables for the optimization process are the inter-story drift ratio profiles resulting from the multi-mode pushover analyses, and the objective values are the outcomes of the incremental dynamic analysis (IDA). Here, the collapse capacity of the structures is assessed in three to five steps, using a modified IDA procedure. A series of regular mid-rise steel MRFs are selected and analyzed to calculate the modal combination coefficients and to validate the proposed approach. The new methodology is verified against the current existing approaches. This comparison shows that the suggested method more accurately evaluates the EDPs and the collapse capacity of the regular MRFs in a robust and easy to implement way.

Keywords

Acknowledgement

The work presented here is conducted as part of the project No. 7403 "Developing a Methodology for Seismic Collapse Probability Assessment of Existing Mid-rise Steel Buildings", funded by the International Institute of Earthquake Engineering and Seismology (IIEES).

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