土-基础结构相互作用下的桥墩结构抗震响应

Seismic response of the system of soil and foundation in bridge structure unden earth quake

为解决桥梁结构土—基础作用体系在地震作用下的抗震响应问题.以实际工程为研究分析背景,采用有限元数值模拟方法,对边界、上部结构质量进行合理简化,运用ANSYS有限元分析软件建立结构体系抗震响应的二维有限元模型,通过模型分析了在修正后的埃尔森特罗及Taft地震波水平作用下的桥梁的模态、桥墩的抗震响应.证明了在进行桥墩抗震设计时土-基础-结构的相互作用是不能忽略的,且起到不利作用,研究结论表明在桥梁抗震设计中要充分考虑结构-土-基础相互作用.

In order to solve the seismic response problem of the system of soil and foundation in bridge structure under earthquake,against the research background of practical project,by means of the finite elements numerical simulation,the quality of the boundary and superstructure is simplified in a reasonable manner.The two dimensional finite element model of the seismic response is built by means of the finite element software—ANSYS,and the revised modal of bridge and the seismic response of pier under the action of El Centro and Taft seismic waves is analyzed through the model.The results of this study show that the interaction of soil,foundation and structure can not be ignored during the aseismic design of pier,also the interaction is detrimental and should be fully considered in the aseismic design of bridge.