Scholarlink

In this study, a vulnerability assessment of RC (reinforced concrete) bridge structures was conducted using two sets of forward directivity earthquakes. One set contains ten near-fault pulse-like ground motions (NFPL-GMs) with low-directivity (low frequency; i.e. PGV/PGA < 160 cm/s/g), and the other contains ten NFPL-GMs with high-directivity (high frequency; i.e. PGV/PGA > 160 cm/s/g). Incremental dynamic analysis (IDA) was performed for each set of ground motions to obtain fragility curves based on the intensity measure “PGA” (Peak Ground Acceleration). A fiber-based model, utilizing the material’s nonlinear stress strain curves, was adopted to quantify seismic damage. Material strain-based limits were used to define different damage levels. A comparative study was conducted to analyze the responses to low and high directivity ground motions. The analytical results revealed that ground motions (GMs) with a high PGV to PGA ratio (greater than 160 cm/s/g) induced more damage to the RC bridge and pose a significant vulnerability. The study is highly valuable for assessing seismic vulnerability, monitoring structural health, and developing retrofit strategies for RC bridges.

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 Pulse-Like Ground Motions with Directivity Effect on the Seismic Vulnerability Assessment of RC Bridges

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Fahad Bin Khurshid,
  • Md Shafquat Izhar,
  • Nazrul Islam

摘要

In this study, a vulnerability assessment of RC (reinforced concrete) bridge structures was conducted using two sets of forward directivity earthquakes. One set contains ten near-fault pulse-like ground motions (NFPL-GMs) with low-directivity (low frequency; i.e. PGV/PGA < 160 cm/s/g), and the other contains ten NFPL-GMs with high-directivity (high frequency; i.e. PGV/PGA > 160 cm/s/g). Incremental dynamic analysis (IDA) was performed for each set of ground motions to obtain fragility curves based on the intensity measure “PGA” (Peak Ground Acceleration). A fiber-based model, utilizing the material’s nonlinear stress strain curves, was adopted to quantify seismic damage. Material strain-based limits were used to define different damage levels. A comparative study was conducted to analyze the responses to low and high directivity ground motions. The analytical results revealed that ground motions (GMs) with a high PGV to PGA ratio (greater than 160 cm/s/g) induced more damage to the RC bridge and pose a significant vulnerability. The study is highly valuable for assessing seismic vulnerability, monitoring structural health, and developing retrofit strategies for RC bridges.