Scholarlink

In this paper, a 3D finite element model of the high arch dam-foundation system is established, taking into account the contact nonlinearities at different contact surfaces. Based on the incremental dynamic analysis (IDA), 1000 nonlinear dynamic response analyses are performed accounting for parameter and ground motion uncertainty. Firstly, correlations between various intensity measures (IM) and seismic stability performance evaluation indexes are discussed in terms of efficiency, practicality, proficiency, and goodness-of-fitting. Three optimal IMs i.e., peak ground acceleration (PGA), spectral acceleration at fundamental period (Sa_F) and acceleration spectral intensity (ASI) are chosen. Secondly, different limit states (LS) are quantitatively divided by taking residual sliding displacement (Ures) and sliding area ratio (Acr/A) as seismic stability evaluation indexes. Finally, seismic fragility curves are generated using selected optimal IMs and evaluation indexes. The effect of uncertainties on seismic fragility curves is discussed through comparative analysis. Moreover, the seismic stability of the high arch dam-foundation system is comprehensively evaluated according to seismic fragility curves, which can provide a justified rationale for changing from the determinate method to that based on the probabilistic and statistical framework.

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

Optimal Intensity Measure Selection and Seismic Fragility Assessment of High Arch Dams

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Chunli Yan,
  • Jin Tu,
  • Hui Liang,
  • Haizhong Zhao,
  • Peng Hao,
  • Cuiran Zhang,
  • Shengshan Guo,
  • Deyu Li

摘要

In this paper, a 3D finite element model of the high arch dam-foundation system is established, taking into account the contact nonlinearities at different contact surfaces. Based on the incremental dynamic analysis (IDA), 1000 nonlinear dynamic response analyses are performed accounting for parameter and ground motion uncertainty. Firstly, correlations between various intensity measures (IM) and seismic stability performance evaluation indexes are discussed in terms of efficiency, practicality, proficiency, and goodness-of-fitting. Three optimal IMs i.e., peak ground acceleration (PGA), spectral acceleration at fundamental period (Sa_F) and acceleration spectral intensity (ASI) are chosen. Secondly, different limit states (LS) are quantitatively divided by taking residual sliding displacement (Ures) and sliding area ratio (Acr/A) as seismic stability evaluation indexes. Finally, seismic fragility curves are generated using selected optimal IMs and evaluation indexes. The effect of uncertainties on seismic fragility curves is discussed through comparative analysis. Moreover, the seismic stability of the high arch dam-foundation system is comprehensively evaluated according to seismic fragility curves, which can provide a justified rationale for changing from the determinate method to that based on the probabilistic and statistical framework.