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<p>Concrete arch dams are susceptible to long-term deterioration under harsh environmental conditions, which can influence their stability and seismic performance. This paper investigates the seismic performance of the Idukki Arch Dam under earthquake excitations with varying frequency content while considering the effects of concrete aging over time. The concrete deterioration in the arch dam is assumed to develop due to chemo-mechanical action occurring during its life span. The seismic behavior of the Idukki Arch Dam was studied using time history responses under earthquake loadings with low, medium, and high frequency content at different ages, specifically at 1&#xa0;year, 50&#xa0;years, and 100&#xa0;years. A finite element model of the dam-reservoir-foundation system was developed in ANSYS software to study the influence of reservoir effects during seismic events. The seismic responses were evaluated in terms of natural frequency, fundamental period, crest displacement, hydrodynamic pressure, and tensile stresses, particularly in the upstream faces of the dam. The tensile stresses were found to change with age and were determined along with the demand capacity ratio and cumulative inelastic duration. Specifically, under the earthquake loading with high frequency content, the peak tensile stresses were decreased by 74% at 50&#xa0;years due to material degradation. However, due to increased crest displacement over time, tensile stresses subsequently increase to its initial stress state by 100&#xa0;years. These results highlighted the importance of structural monitoring to ensure the safety and resilience of aging arch dams subjected to seismic excitations.</p>

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Investigations on seismic response of Idukki Arch Dam considering concrete ageing

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Rinku John,
  • S. Deepa Balakrishnan

摘要

Concrete arch dams are susceptible to long-term deterioration under harsh environmental conditions, which can influence their stability and seismic performance. This paper investigates the seismic performance of the Idukki Arch Dam under earthquake excitations with varying frequency content while considering the effects of concrete aging over time. The concrete deterioration in the arch dam is assumed to develop due to chemo-mechanical action occurring during its life span. The seismic behavior of the Idukki Arch Dam was studied using time history responses under earthquake loadings with low, medium, and high frequency content at different ages, specifically at 1 year, 50 years, and 100 years. A finite element model of the dam-reservoir-foundation system was developed in ANSYS software to study the influence of reservoir effects during seismic events. The seismic responses were evaluated in terms of natural frequency, fundamental period, crest displacement, hydrodynamic pressure, and tensile stresses, particularly in the upstream faces of the dam. The tensile stresses were found to change with age and were determined along with the demand capacity ratio and cumulative inelastic duration. Specifically, under the earthquake loading with high frequency content, the peak tensile stresses were decreased by 74% at 50 years due to material degradation. However, due to increased crest displacement over time, tensile stresses subsequently increase to its initial stress state by 100 years. These results highlighted the importance of structural monitoring to ensure the safety and resilience of aging arch dams subjected to seismic excitations.