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In this study, the impact of scour and corrosion on the seismic performance of bridges was investigated, with a cross-river PC continuous girder bridge in the seismically active Dujiangyan area of Sichuan Province, China, used as a case study. Two types of substructures with varying degrees of damage were constructed, and a finite element model was established to analyze the bridge’s nonlinear seismic response. Fragility curves under different damage conditions were built to analyze the effects of these hazards quantitatively. The analysis showed that for a 6 m scour, the probability of serious damage at a Peak Ground Acceleration (PGA) of 1.0 increased by 54.11% compared to a 4 m scour. Similarly, with 50% corrosion at a PGA of 1.0, the probability of serious damage increased by 65.35% compared to no damage. These findings have significant implications for understanding the seismic performance characteristics exhibited by PC continuous girder bridges subjected to scour and corrosion.

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Effect of Typical Substructure Damages on the Seismic Fragility of Continuous Concrete Girder Bridge

  • 会议论文

  • 发表日期：

    2025年

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  • Zaiba Sun,
  • Jun Ma,
  • Guowei Lin,
  • Yan Li

摘要

In this study, the impact of scour and corrosion on the seismic performance of bridges was investigated, with a cross-river PC continuous girder bridge in the seismically active Dujiangyan area of Sichuan Province, China, used as a case study. Two types of substructures with varying degrees of damage were constructed, and a finite element model was established to analyze the bridge’s nonlinear seismic response. Fragility curves under different damage conditions were built to analyze the effects of these hazards quantitatively. The analysis showed that for a 6 m scour, the probability of serious damage at a Peak Ground Acceleration (PGA) of 1.0 increased by 54.11% compared to a 4 m scour. Similarly, with 50% corrosion at a PGA of 1.0, the probability of serious damage increased by 65.35% compared to no damage. These findings have significant implications for understanding the seismic performance characteristics exhibited by PC continuous girder bridges subjected to scour and corrosion.