| 有缝拱坝-地基系统非线性地震波动反应分析方法 |
| |
| 引用本文： | 杜修力,涂劲,陈厚群.有缝拱坝-地基系统非线性地震波动反应分析方法[J].地震工程与工程振动,2000,20(1):11-20. |
| |
| 作者姓名： | 杜修力 涂劲 陈厚群 |
| |
| 作者单位： | 中国水利水电科学研究院,北京,100044 |
| |
| 基金项目： | 国家“九五”重点科技攻关项目!96-221-03-02-02，国家自然科学基金!59739180 |
| |
| 摘 要： | 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缝界面最大张开率是不足的。此外，坝基中存在的断层、节理、裂隙待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
|
| 关 键 词： | 拱坝 缝界面 无限地基 地震反应 地震波 |
Nonlinear seismic response analysis of arch dam-foundation systems with cracked surfaces |
| |
| DU Xiu-li,TU Jin,CHEN Hou-qun.Nonlinear seismic response analysis of arch dam-foundation systems with cracked surfaces[J].Earthquake Engineering and Engineering Vibration,2000,20(1):11-20. |
| |
| Authors: | DU Xiu-li TU Jin CHEN Hou-qun |
| |
| Abstract: | It is important for the seisndc response analysis of arch dams to simulate opening and dosing of cracks in the dam under strong earthquake. The present models used in seismic response analysis of arch darns, such as Fenves' model and Dowlings' model, have the shortcodring that the accuracy to simulate the contact state between cracked surfaces is not high.It results in that the maximum opetting between cracked surfaces is not predicted accurately. In addition, the nonlinear behaviors of geological structure 'are unavoidably existing in the near-field foundation for every dam site and the effects of the energy dispersion in the infinite foundation are also important for the seisAnc response analysis of arch dams. It is diffcult to con gider the three factors mentioned above together in the seismic response analysis of arch dams, and it has not been solved yet. Combining a contact force model simulating the contact condition between the contact interfaces with an explicit finite element method in which the artificial boundary condition is a transmitting boundary is used to solve this diffcult problem and the contact force model has better accuracy for the contact state simulation between the cracked surfaces than Fenves' model, which is verified by comparing the results calculated by the contact foree model and Fenves' model with the results tested on shaking table. In this paper, the static response of arch dams is solved by using the dynaAnc analysis method, and furthermore, a combining method for the action of static and dynamic load is proposed for the nonlinear response of arch dams. Finally. Some results are obtained by using this approach to the seismic analysis of a designed Xiaowan arch dam with contracted joints and bottom crack on the dam with maximum height of 292m in China. |
| |
| Keywords: | arch dams cracked surface infinite foundation seismic response |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
