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<p>Bridges are crucial components of transportation infrastructure. This study investigates the seismic response of reinforced concrete bridge to near-field and far-field ground motions, focusing on mainshock-aftershock sequences. While existing research primarily emphasizes mainshock-induced damage, limited studies have explored the cumulative effects of sequential seismic events on structural fragility. This study addresses this gap by employing a nonlinear finite element model to assess progressive damage under complex seismic loading. Employing nonlinear finite element modeling, Incremental Dynamic Analysis, and fragility curves, the research assesses progressive damage under complex seismic loading. Results indicate that near field ground motions lead to more rapid damage accumulation, with collapse-level drift ratios occurring under aftershocks compared to far-field scenarios. PGA-based fragility analysis reveals that near field conditions induce failure at lower PGA values. Pre-damaged structures exhibit reductions in seismic resistance, underscoring the cumulative effects of sequential earthquake events. These findings emphasize the necessity of site-specific seismic design and retrofitting strategies, considering near-field and far-field effects and mainshock-aftershock sequences, to enhance structural resilience and mitigate failure risks in seismically active regions.</p>

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Evaluating seismic reliability of RC bridge: MS-AS sequences in near & far field regions

  • 期刊论文

  • 发表日期：

    2025年12月4日

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

摘要

Bridges are crucial components of transportation infrastructure. This study investigates the seismic response of reinforced concrete bridge to near-field and far-field ground motions, focusing on mainshock-aftershock sequences. While existing research primarily emphasizes mainshock-induced damage, limited studies have explored the cumulative effects of sequential seismic events on structural fragility. This study addresses this gap by employing a nonlinear finite element model to assess progressive damage under complex seismic loading. Employing nonlinear finite element modeling, Incremental Dynamic Analysis, and fragility curves, the research assesses progressive damage under complex seismic loading. Results indicate that near field ground motions lead to more rapid damage accumulation, with collapse-level drift ratios occurring under aftershocks compared to far-field scenarios. PGA-based fragility analysis reveals that near field conditions induce failure at lower PGA values. Pre-damaged structures exhibit reductions in seismic resistance, underscoring the cumulative effects of sequential earthquake events. These findings emphasize the necessity of site-specific seismic design and retrofitting strategies, considering near-field and far-field effects and mainshock-aftershock sequences, to enhance structural resilience and mitigate failure risks in seismically active regions.