Scholarlink

<p>Recent seismic events have underscored the need to better understand how the duration and frequency content of ground motions affect the seismic performance of bridges. While skewed bridge geometries present known challenges, the role of long-duration and long-period seismic inputs in amplifying these vulnerabilities remains insufficiently explored. This study evaluates the impact of ground motion duration and spectral characteristics on the seismic fragility of skew-curved reinforced concrete highway bridges using a suite of nonlinear time-history analyses in OpenSees. Spectrally compatible short- and long-duration ground motion pairs were employed to isolate duration effects while preserving frequency content, and system-level damage states were defined according to HAZUS-MH guidelines. Results show that long-duration and long-period motions lower median PGA capacities by up to 40% for key components such as deck unseating and columns, with the effect most pronounced at extensive and complete damage states. Although increasing skew angle further amplifies vulnerability, ground motion duration and frequency content remain the dominant drivers of overall system fragility, underscoring the need to explicitly include these parameters in fragility assessments to achieve reliable performance predictions for irregular bridge systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Impact of Long-Period and Long-Duration Earthquakes on the Seismic Fragility of Skew-Curved Bridges

  • 期刊论文

  • 发表日期：

    2025年11月19日

查看全文
  • Fatemeh Asen,
  • Hossein Pahlavan,
  • Mohammad Shamekhi Amiri,
  • Ali Naseri

摘要

Recent seismic events have underscored the need to better understand how the duration and frequency content of ground motions affect the seismic performance of bridges. While skewed bridge geometries present known challenges, the role of long-duration and long-period seismic inputs in amplifying these vulnerabilities remains insufficiently explored. This study evaluates the impact of ground motion duration and spectral characteristics on the seismic fragility of skew-curved reinforced concrete highway bridges using a suite of nonlinear time-history analyses in OpenSees. Spectrally compatible short- and long-duration ground motion pairs were employed to isolate duration effects while preserving frequency content, and system-level damage states were defined according to HAZUS-MH guidelines. Results show that long-duration and long-period motions lower median PGA capacities by up to 40% for key components such as deck unseating and columns, with the effect most pronounced at extensive and complete damage states. Although increasing skew angle further amplifies vulnerability, ground motion duration and frequency content remain the dominant drivers of overall system fragility, underscoring the need to explicitly include these parameters in fragility assessments to achieve reliable performance predictions for irregular bridge systems.