【摘要】 随着高海拔、高寒、高烈度地震区水电工程的建设,基于强度的拱坝抗震安全评价标准已无法满足工程实践的需要。本文采用非线性数值分析模型对拱坝进行了地震动IDA(逐步动力增量分析)研究,提出了评价大坝抗震安全性新指标,即:坝体损伤体积比和坝面损伤面积比;结合实际工程分析了地震峰值加速度与坝体位移、坝体损伤体积比和坝面损伤面积比之间的关系。结果表明,相比于已有的拱坝抗震性能评价指标,所提出的坝体损伤体积比和坝面损伤面积比指标,可以更清晰地反映出不同强度地震动作用下的拱坝损伤变化趋势和抗震承载能力,更适合作为评价拱坝抗震性能的指标。更多还原

【Abstract】 The index based concrete strength for seismic safety evaluation of arch dam has become difficultto meet the requirements of hydropower project construction in high altitude,alpine and high intensity earth-quake region. The IDA(Incremental Dynamic Analysis) was performed to study the nonlinear seismic behav-ior of arch dam. Two new seismic safety evaluation indices of damage area ratio and damage volume ratiowere proposed and the correlations of these two indices and dynamic displacements at different part of archdam with seismic peak acceleration were analyzed. The results show that the proposed damage area ratioand damage volume ratio can reflect the damage evolution trend with earthquake intensities and the seismicbearing capacity more obviously than previous index and more suitable for arch dam seismic safety evaluation.更多还原