论文部分内容阅读
拱坝坝体中缝界面在地震作用下的开、合模拟对拱坝地震反应有重要影响。目前在拱坝地震反应分析中应用的一些模型，如Fenves模型、Dowling的三参数模型，存在对缝界面的接触状态模拟精度不高的问题，这对于准确评价工程上关心的经界面最大张开度是不足的。此外，坝基中存在的断层、节理、裂隙等软弱夹层的非线性力学特性和无限地基能量辐射作用对拱坝地震反应也有重要影响．在拱坝地震反应分析中同时考虑这三种影响因素难度很大，在国际上尚未解决，本文将动接触力模型与景式有限元的波动模拟方法相结合，解决了这一难题，并且提高了缝界面接触状态的模拟精度．文中还利用动力学方法求解了拱坝的静态反应，并在此基础上提出了上种适用于非线性结构反应的静、动作用组合方法。最后；以拟建中的小湾拱坝为例分析了横缝和底缝对拱坝地震反应的影响。
The opening and closing of the seam interface of the arch dam under earthquake action have an important influence on the seismic response of the arch dam. At present, some models used in seismic response analysis of arch dam, such as the Fenves model and Dowling’s three-parameter model, have the problem of low simulation accuracy of the contact state of the seam interface. This is of great importance in accurately evaluating the maximum open degree of the interface Insufficient. In addition, the nonlinear mechanical properties of faulty joints, joints and fissures existing in the dam foundation and the influ- ence of infinite ground energy radiation have an important influence on the seismic response of the arch dam. It is very difficult to consider these three influencing factors in the seismic response analysis of arch dam at the same time and has not been solved in the world. This paper solves this problem by combining the dynamic contact force model with the simulation method of the finite element method. The simulation accuracy of the seam interface contact state. In this paper, the dynamic response of arch dam is also solved. Based on this, a combination method of static and dynamic response to nonlinear structural response is proposed. Finally, taking the Xiaowan arch dam as an example, the influence of transverse joint and bottom seam on seismic response of arch dam is analyzed.