Earthquakes and Structures

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Developing a modified IDA-based methodology for investigation of influencing factors on seismic collapse risk of steel intermediate 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))
  • Received : 2019.09.29
  • Accepted : 2020.02.14
  • Published : 2020.03.25
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Abstract

Incremental dynamic analysis (IDA) widely uses for the collapse risk assessment procedures of buildings. In this study, an IDA-based collapse risk assessment methodology is proposed, which employs a novel approach for detecting the near-collapse (NC) limit state. The proposed approach uses the modal pushover analysis results to calculate the maximum inter-story drift ratio of the structure. This value, which is used as the upper-bound limit in the IDA process, depends on the structural characteristics and global seismic responses of the structure. In this paper, steel midrise intermediate moment resisting frames (IMRFs) have selected as case studies, and their collapse risk parameters are evaluated by the suggested methodology. The composite action of a concrete floor slab and steel beams, and the interaction between the infill walls and the frames could change the collapse mechanism of the structure. In this study, the influences of the metal deck floor and autoclaved aerated concrete (AAC) masonry infill walls with uniform distribution are investigated on the seismic collapse risk of the IMRFs using the proposed methodology. The results demonstrate that the suggested modified IDA method can accurately discover the near-collapse limit state. Also, this method leads to much fewer steps and lower calculation costs rather than the current IDA method. Moreover, the results show that the concrete slab and the AAC infill walls can change the collapse parameters of the structure and should be considered in the analytical modeling and the collapse assessment process of the steel mid-rise intermediate moment resisting frames.

Keywords

Acknowledgement

Grant : Developing a Methodology for Seismic Collapse Probability Assessment of Existing Mid-rise Steel Buildings

Supported by : International Institute of Earthquake Engineering and Seismology (IIEES)

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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