新旧抗震规范下重力坝抗震安全性能分析

发布时间：2018-04-04 14:20

本文选题：抗震设计规范　切入点：反应谱法　出处：《人民长江》2017年01期

【摘要】：结合新修订的《水电工程水工建筑物抗震设计规范》(NB35047-2015)与原来的《水工建筑物抗震设计规范》(DL5073-2000),采用振型分解反应谱法分析了新旧规范下重力坝地震动应力、动位移与动加速度的分布规律。研究结果表明:与采用原规范计算得到的结果相比,采用修订规范后,各坝型基频对应的反应谱放大系数增大,计算出的坝顶动位移有所增大,而坝顶动加速度反应却呈现降低趋势;建基面部位地震动应力反应有所增大;坝头部位的地震动应力反应有所降低;坝头部位以下的上、下游坝面地震动应力有所增大。结论为工程设计人员利用新抗震规范对重力坝进行抗震安全性评价提供了参考。
[Abstract]:Combined with the newly revised Code for Seismic Design of hydraulic structures in Hydropower Engineering (NB35047-2015) and the original Code for Seismic Design of hydraulic structures (DL5073-2000), the seismic stresses of gravity dams under the new and old codes are analyzed by using the mode decomposition response spectrum method.The distribution of dynamic displacement and acceleration.The results show that, compared with the results obtained by the original code, the magnification factor of the response spectrum corresponding to the foundation frequency of each dam type increases and the calculated dynamic displacement of the dam top increases after adopting the revised code.But the dynamic acceleration response of the dam is decreasing; the stress response of the ground motion on the face of the foundation has increased; the response of the ground motion stress at the head of the dam has been reduced; and the ground motion stress of the upper and lower reaches of the dam is increased under the head of the dam.The conclusion provides a reference for engineering designers to evaluate the seismic safety of gravity dams by using the new seismic code.
【作者单位】：大连理工大学海岸与近海工程国家重点实验室;大连理工大学水利工程学院;中国电建集团成都勘测设计研究院有限公司;
【基金】：国家重点基础研究发展计划项目(2013CB035905)
【分类号】：TV642.3;TV312

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