地震动斜入射对桩-土-网壳结构地震响应影响  

The effect of oblique incidence of seismic wave on seismic response of pile-soil-latticed shell

作　　者：刘毅[1] 李雄彦[1] 薛素铎[1] 

机构地区：[1]北京工业大学空间结构研究中心,北京100124

出　　处：《振动工程学报》2015年第1期139-147,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51078010;51278008);北京市自然科学基金资助项目(8112005)

摘　　要：基于粘弹性边界基本理论,结合大型有限元软件ABAQUS和FORTRAN程序,采用时域波动方法实现粘弹性人工边界的地震动斜入射,并建立桩-土-单层柱面网壳结构的三维整体计算模型,研究在考虑桩-土-结构动力相互作用（PSSI）下地震动输入方向对单层柱面网壳结构地震响应的影响。研究表明：当入射角度在40°~60°时,桩体的地震响应大于土体的地震响应,同时边桩的地震响应大于内桩地震响应;桩-土-单层柱面网壳结构体系的地震响应未必在地震动垂直入射时最大,整体结构体系的水平地震响应在入射角为45°~60°时出现最大值;在进行地震分析时宜考虑地震动入射角度对桩-土-单层柱面网壳结构体系地震响应的影响。The time-domain wave method is adopted to achieve oblique incidence of earthquake waves based on the basic theory of viscoelastic boundary,combining with ABAQUS and FORTRAN program.A three-dimensional finite element integral computation model is established.The integral computation model consists of single layer reticulated cylindrical shell,pile and foundation soil.The seismic responses of the single layer reticulated cylindrical shell are analyzed considering different incidence angles of earthquake waves and pile-soil-structure interaction（PSSI）.The results indicate that the seismic response of the piles is larger than the soil under the action of seismic waves with the range of incidence angel from 40°to 60°,and the seismic response of the outside piles is greater than the inner piles.The seismic response of the pile-soil-single layer reticulated cylindrical shell is not always the largest for the vertical incidence of earthquake waves.The horizontal seismic response of pile-soil-single layer reticulated cylindrical shell appears maximum values under the action of seismic waves with the range of incidence angel from 45°to 60°.The effects of different incidence angles of earthquake waves on the pile-soil-single layer reticulated cylindrical shell should be considered in seismic analysis.

关 键 词：单层柱面网壳结构 时域波动法 粘弹性边界 地震动斜入射 地震响应 

分 类 号：TU435[建筑科学—岩土工程] TU435[建筑科学—土工工程]