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<p>The seismic resilience of structures is critically dependent on the adoption of an appropriate lateral force-resisting system. Steel bracing systems are one of the most efficient ways to improve the seismic resilience and sustainability of multi-story RC structures susceptible to potential earthquake damage. Many existing RC structures worldwide are being strengthened using different types of steel bracing systems. It is crucial to identify the most effective bracing system for existing multi-story buildings to enhance their resilience during earthquakes. Hence, this study evaluates and compares the intervention of various bracing patterns, such as X bracing, inverted-V bracing, ZX bracing, and Zipper bracing to the seismically vulnerable RC frames, to obtain the most efficient earthquake resilient structure using the advanced seismic assessment tools. The seismic behaviors of three existing seismically deficient buildings with varying heights and numbers of bays are analyzed through the nonlinear dynamic analyses along with fiber hinge modeling approach for accurately capturing the comprehensive inelastic responses of RC braced frames. The inelastic responses are evaluated in terms of non-linear fiber hinge state/result, material inelastic strain behaviors, roof displacement history, and inter-story drift ratio. Afterward, insightful observations on the performance of the various RC braced frames for earthquake resilience reveal that the inverted-V bracing system is identified as an efficient solution for retrofitting of building structures.</p>

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Seismic evaluation of existing RC frames retrofitted with different steel bracing systems through fiber based nonlinear dynamic responses

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Morshedul Islam,
  • Shohel Rana

摘要

The seismic resilience of structures is critically dependent on the adoption of an appropriate lateral force-resisting system. Steel bracing systems are one of the most efficient ways to improve the seismic resilience and sustainability of multi-story RC structures susceptible to potential earthquake damage. Many existing RC structures worldwide are being strengthened using different types of steel bracing systems. It is crucial to identify the most effective bracing system for existing multi-story buildings to enhance their resilience during earthquakes. Hence, this study evaluates and compares the intervention of various bracing patterns, such as X bracing, inverted-V bracing, ZX bracing, and Zipper bracing to the seismically vulnerable RC frames, to obtain the most efficient earthquake resilient structure using the advanced seismic assessment tools. The seismic behaviors of three existing seismically deficient buildings with varying heights and numbers of bays are analyzed through the nonlinear dynamic analyses along with fiber hinge modeling approach for accurately capturing the comprehensive inelastic responses of RC braced frames. The inelastic responses are evaluated in terms of non-linear fiber hinge state/result, material inelastic strain behaviors, roof displacement history, and inter-story drift ratio. Afterward, insightful observations on the performance of the various RC braced frames for earthquake resilience reveal that the inverted-V bracing system is identified as an efficient solution for retrofitting of building structures.