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<p>The study focuses on the fragility assessment of Steel Moment Resisting Frames designed by Force Based Design using the Indian Standard code and the Performance-Based Plastic Design (PBPD) method. Fragility curves were developed using the Capacity Spectrum Method (CSM), which evaluates the Probability of Exceedance (PoE), surpassing predefined damage states under varying seismic intensities using Nonlinear Static Pushover Analysis. The findings demonstrate that PBPD frames perform exceptionally well in achieving the target yield drift ratio and reducing susceptibility to seismic damage compared to frames designed using the IS method. The analysis was conducted for 3, 9, and 12-story frames in India’s high seismic zones, highlighting the advantages of PBPD in attaining the target yield drift ratio and lowering the PoE across different damage states.</p>

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Fragility Assessment of Steel Moment-Resisting Frames: Force-Based Design vs. Performance-Based Plastic Design

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Bapugouda B. Biradar,
  • Anoop I. Shirkol,
  • Thanongsak Imjai

摘要

The study focuses on the fragility assessment of Steel Moment Resisting Frames designed by Force Based Design using the Indian Standard code and the Performance-Based Plastic Design (PBPD) method. Fragility curves were developed using the Capacity Spectrum Method (CSM), which evaluates the Probability of Exceedance (PoE), surpassing predefined damage states under varying seismic intensities using Nonlinear Static Pushover Analysis. The findings demonstrate that PBPD frames perform exceptionally well in achieving the target yield drift ratio and reducing susceptibility to seismic damage compared to frames designed using the IS method. The analysis was conducted for 3, 9, and 12-story frames in India’s high seismic zones, highlighting the advantages of PBPD in attaining the target yield drift ratio and lowering the PoE across different damage states.