基于反应谱法的重力坝有限元等效动应力响应分析  

FE equivalent dynamic stress analysis based onresponse spectrum method for gravity dams

作　　者：李同春[1] 胡继刚[1] 赵兰浩[1] 张丽萍[1] 

机构地区：[1]河海大学水利水电工程学院,南京210098

出　　处：《水力发电学报》2009年第5期19-22,18,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金委员会资助项目(90510017)

摘　　要：提出了由有限元法得到的振型求解振型内力及振型等效应力,并根据反应谱法理论求解重力坝等效动应力响应的分析方法。本文对四个在建或拟建的重力坝,用悬臂梁反应谱法和有限元等效应力法分别进行了计算,比较了坝体几个典型部位等效动应力响应。结果表明,在坝体体型有突变的地方,有限元等效应力法相较悬臂梁法所得值有明显的增高,更敏锐的反映出了应力集中对坝体垂直动应力的影响。本文提出的方法简单易行,比悬臂梁反应谱法更能反映坝体体型的影响。This paper presents an equivalent dynamic stress analysis for gravity dams based on the response spectrum method and finite element （FE） analysis, and proposes a formula to directly calculate the. internal forces and equivalent stresses for each vibration mode from the finite element method （FEM） data of vibration modes. The equivalent stresses of four dams under construction or proposed are computed as test cases by the response spectrum method of cantilever model or by FEM, with the equivalent dynamic stresses compared for several typical locations. The results show that the equivalent stress obtained from the FE vibration modes is better than that from cantilever model. The former can reasonably reflect the stress concentration due to the sudden change of dam profile. The proposed method of FE equivalent stress analysis is easy to implement.

关 键 词：水工结构 等效动应力 反应谱法 悬臂梁法 有限元法 重力坝 

分 类 号：TV312[水利工程—水工结构工程]