坝体形状对悬臂梁法计算重力坝地震反应的影响

Influence of Gravity Dam Shape on Seismic Response by Using Cantilever Beam Method

为了研究重力坝坝体形状对悬臂梁法计算结果的影响,以八座实体重力坝为例,分别采用悬臂梁法和有限元法,从大坝的自振特性、静动应力等方面进行比较分析。结果表明,坝高、宽高比、水深比和坝型突变会影响悬臂梁法计算自振特性、动力响应的准确性,因此建议实际工程分析时对于不利的坝体形状应再补作有限元法动力分析予以验证。

To study the influence of gravity dam shape on seismic response by using cantilever beam method,taking the eight solid gravity dam for an example,cantilever beam method and finite element method were used to study the vibration characteristics and stress.The results show that the accuracy of cantilever beam method is affected by dam height,aspect ratio,depth ratio and abrupt change of dam.It is recommended that we should do FEM dynamic analysis for supplement about some dams with adverse shape.