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In this study, quantification of seismic damage to reinforced concrete (RC) bridges has been conducted under near-field ground motions with high directivity (NFGMs-HD) and a PGV/PGA higher than 160 cm/s/g. These ground motions, known for their velocity pulses with high amplitude, pose significant threats to the structures. Incremental dynamic analysis (IDA) has been carried out against intensity measure (IM) “Peak Ground Acceleration (PGA)” under NFGMs-HD to obtain the fragility curves. Four damage states have been defined based on material strain limits: slight damage (DS1), moderate damage (DS2), extensive damage (DS3), and collapse damage (DS4). Using these strain limits, threshold values for the drift ratios associated with each damage state have been established under NFGMs-HD. The findings underscore the vulnerability of RC bridges and highlight the necessity of incorporating NFGMs-HD characteristics and fragility analysis in seismic design codes to enhance the performance of RC bridges. This research contributes to the overall knowledge of seismic risk assessment by providing critical insights into the performance of RC bridges under NFGMs-HD, thereby informing future design practices and improving resilience in the face of such seismic events.

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Damage Assessment of Continuous RC Bridge under Near-Field Ground Motions with High Directivity

  • 会议论文

  • 发表日期：

    2026年

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

摘要

In this study, quantification of seismic damage to reinforced concrete (RC) bridges has been conducted under near-field ground motions with high directivity (NFGMs-HD) and a PGV/PGA higher than 160 cm/s/g. These ground motions, known for their velocity pulses with high amplitude, pose significant threats to the structures. Incremental dynamic analysis (IDA) has been carried out against intensity measure (IM) “Peak Ground Acceleration (PGA)” under NFGMs-HD to obtain the fragility curves. Four damage states have been defined based on material strain limits: slight damage (DS1), moderate damage (DS2), extensive damage (DS3), and collapse damage (DS4). Using these strain limits, threshold values for the drift ratios associated with each damage state have been established under NFGMs-HD. The findings underscore the vulnerability of RC bridges and highlight the necessity of incorporating NFGMs-HD characteristics and fragility analysis in seismic design codes to enhance the performance of RC bridges. This research contributes to the overall knowledge of seismic risk assessment by providing critical insights into the performance of RC bridges under NFGMs-HD, thereby informing future design practices and improving resilience in the face of such seismic events.