摘要
文中采用有限元-间接边界元(FEM-IBEM)耦合法,研究土体非线性对土-结构动力相互作用(SSI)的影响。二维模型中,远场土体采用间接边界元法(IBEM)模拟,近场土体采用有限元法(FEM)模拟;采用等效线性模型考虑土体非线性。以著名的Millikan图书馆为例计算表明,土体非线性对SSI有明显影响。考虑土体非线性后,结构基底剪力、层间位移角以及系统频率均明显降低,而且地震波幅值越大,或土体非线性越强,非线性动力响应的降低程度越大。研究对于定量评估土体非线性对SSI的影响具有一定的参考价值。
The effect of soil nonlinearity on dynamic soil-structure interaction(SSI)is studied using the coupled finite-element and indirect-boundary-element method.In the 2D model,the far-field soil is simulated by the indirect boundary element method(IBEM)and the near-field soil is simulated by the finite element method(FEM);the soil nonlinear behavior is taken into account by the equivalent linearization model.The case analysis of the Millikan Library building shows that soil nonlinearity plays a significant role on SSI.After considering soil nonlinearity,the base shear,the structure drift and the system frequency are all reduced rapidly compared to responses that in linear cases.The reduction degree of the nonlinear SSI responses is more significant in the cases of larger amplitude of the seismic waves or stronger nonlinearity of the soil.
作者
梁建文
杨晶丽
韩冰
朱俊
LIANG Jianwen;YANG Jingli;HAN Bing;ZHU Jun(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Department of Civil Engineering and Airport Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Civil Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第3期1-10,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51978462)。
