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<p>The seismic analysis of concrete gravity dams often overlooks the influence of interface joints and the impact of aftershocks. This study incorporates the effects of aftershocks on crack propagation and sliding at the base and lift joint interfaces, using a probabilistic approach to assess the seismic performance of a two-dimensional concrete gravity dam. Sliding along base joint, lift joint and cracking are considered as the predominant failure modes in this study. 15 mainshock–aftershock sequences were selected from the database based on the target spectrum of dam site. The interface joints are modelled using Mohr Coulomb friction model. Incremental dynamic analysis is executed by altering the 5% damped spectral acceleration at the fundamental frequency, ranging from 0.1 to 1&#xa0;g. The relative intensity of aftershock is varied as 0.5, 0.7, 0.9, and 1. Fragility curves are plotted using two parameter log-normal distribution considering various limit states. Results show that lift joints, base joints, and concrete cracking are significantly impacted by aftershocks. Out of three damage states considered, sliding failure along lift joints contributed to larger probability of failure compared to concrete cracking and sliding along base joint. The probability of failure due to mainshock for sliding at lift joint at 0.5&#xa0;g is 99.55%, 79.14%, 17.87% and 7.65% for slight, moderate, severe and collapse limit states. For relative intensity of aftershock of value 1, it increases to 99.98%, 99.99%, 81.95% and 17.23% respectively. The developed fragility curves can be used for assessing damage and losses, organising disaster response planning and guiding retrofitting decisions.</p>

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Impact of aftershock on fragility of post-mainshock cracked concrete gravity dams with lift and base joints

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • K. N. Ashna,
  • Priti Maheshwari

摘要

The seismic analysis of concrete gravity dams often overlooks the influence of interface joints and the impact of aftershocks. This study incorporates the effects of aftershocks on crack propagation and sliding at the base and lift joint interfaces, using a probabilistic approach to assess the seismic performance of a two-dimensional concrete gravity dam. Sliding along base joint, lift joint and cracking are considered as the predominant failure modes in this study. 15 mainshock–aftershock sequences were selected from the database based on the target spectrum of dam site. The interface joints are modelled using Mohr Coulomb friction model. Incremental dynamic analysis is executed by altering the 5% damped spectral acceleration at the fundamental frequency, ranging from 0.1 to 1 g. The relative intensity of aftershock is varied as 0.5, 0.7, 0.9, and 1. Fragility curves are plotted using two parameter log-normal distribution considering various limit states. Results show that lift joints, base joints, and concrete cracking are significantly impacted by aftershocks. Out of three damage states considered, sliding failure along lift joints contributed to larger probability of failure compared to concrete cracking and sliding along base joint. The probability of failure due to mainshock for sliding at lift joint at 0.5 g is 99.55%, 79.14%, 17.87% and 7.65% for slight, moderate, severe and collapse limit states. For relative intensity of aftershock of value 1, it increases to 99.98%, 99.99%, 81.95% and 17.23% respectively. The developed fragility curves can be used for assessing damage and losses, organising disaster response planning and guiding retrofitting decisions.