论文部分内容阅读
本文采用频域边界元模拟拱坝地基,通过数值拟合,将地基频域动力刚度转换为等效时域参数,与时域有限元模拟的坝体子结构耦合,建立一个在时域内直接求解、计算效率较高的拱坝-地基动力相互作用分析模型.该模型采用自由场方式输入地震.在拱坝坝体子结构分析中,采用固定界面法求解坝体的模态坐标,并将其与地基子结构耦合,提高了模型的计算效率.为了验证模型的精度和效率,利用加速度脉冲作为自由场输入,求得拱坝的频率响应函数.与频域方法的结果进行对比,证明本文的时域模型具有良好的精度,能节省大量计算时间.此外,时域模型能应用于非线性结构-地基相互作用分析中,是频域方法难以比拟的.
In this paper, the frequency domain boundary element is used to simulate the arch dam foundation. By numerical fitting, the dynamic stiffness in the frequency domain of the foundation is converted into the equivalent time domain parameter and coupled with the dam substructure of the finite element simulation in time domain to establish a direct solution , A computationally efficient arch dam-foundation dynamic interaction analysis model is proposed, which uses a free-field method to input earthquakes.In the substructure analysis of arch dam, a fixed interface method is used to solve the dam’s modal coordinates, In order to verify the accuracy and efficiency of the model, the acceleration response of the arch dam is obtained by using the acceleration pulse as the input of the free field. Comparing with the results of the frequency domain method, it is proved that this model The time-domain model has a good accuracy and can save a lot of computation time.In addition, the time-domain model can be applied in the nonlinear structure-foundation interaction analysis, which is unmatched by the frequency domain method.