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This research delves into the seismic performance of reinforced concrete (RC) bridges exposed to near-field ground motions, specifically focusing on mainshock-aftershock sequences. A comprehensive finite element model was formulated to replicate the bridge’s nonlinear response under complex seismic loading. A unique damage assessment approach was utilized to characterize the progression of structural damage. Incremental dynamic analysis was carried out using ten representative ground motions to create fragility curves for various damage states. The comparison of longitudinal and transverse results across various drift percentages, probability of exceedance, and peak ground acceleration values highlights the significance of considering both mainshock and aftershock effects in seismic design. The results emphasize the importance of incorporating these effects in both longitudinal and transverse directions. The findings advance our comprehension of RC bridge behaviour in near-field environments, contributing to the enhancement of seismic resilience assessment and mitigation planning.

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Influence of Mainshock-Aftershock Sequence on Vulnerability Assessment of RC Bridge Under Longitudinal & Transverse Seismic Motion in Near Field Region

  • 会议论文

  • 发表日期：

    2026年

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  • Mohd Bilal Khan,
  • S. M. Mudassir,
  • Nazrul Islam,
  • Fahad Bin Khurshid

摘要

This research delves into the seismic performance of reinforced concrete (RC) bridges exposed to near-field ground motions, specifically focusing on mainshock-aftershock sequences. A comprehensive finite element model was formulated to replicate the bridge’s nonlinear response under complex seismic loading. A unique damage assessment approach was utilized to characterize the progression of structural damage. Incremental dynamic analysis was carried out using ten representative ground motions to create fragility curves for various damage states. The comparison of longitudinal and transverse results across various drift percentages, probability of exceedance, and peak ground acceleration values highlights the significance of considering both mainshock and aftershock effects in seismic design. The results emphasize the importance of incorporating these effects in both longitudinal and transverse directions. The findings advance our comprehension of RC bridge behaviour in near-field environments, contributing to the enhancement of seismic resilience assessment and mitigation planning.