土-结构相互作用下弦支穹顶结构动力性能分析  

ANALYSIS OF DYNAMIC BEHAVIOR OF SUSPEN-DOME STRUCTURE CONSIDERING SOIL-STRUCTURE INTERACTION

作　　者：李雄彦[1] 王国鑫[1] 薛素铎[1] 刘毅[1] 叶继红[2] 

机构地区：[1]北京工业大学空间结构研究中心,北京100124 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210018

出　　处：《工业建筑》2015年第8期30-36,共7页Industrial Construction

基　　金：国家自然科学基金项目(51078010;51278008);北京市自然科学基金项目(8112005);长江学者和创新团队发展计划资助项目;教育部博士点学科专项科研基金(20121103110021);北京市委组织部优秀人才资助项目

摘　　要：目前对弦支穹顶结构抗震计算一般基于刚性地基假定,但由于基础周围土体并非刚性,在地震作用下会产生变形。为研究弦支穹顶结构在地震作用下考虑土结构相互作用动力响应,建立跨度为92 m的弦支穹顶结构土-结构相互作用有限元模型。基于修正S-R(Sway-Rocking)方法的土体简化模型,分析土-结构相互作用下弦支穹顶结构的自振特性及地震响应特征。研究表明:考虑土-结构相互作用后,弦支穹顶结构的自振频率明显减小;在地震作用下,弦支穹顶上部网壳结构的杆件最大压应力和节点最大位移明显增大,而撑杆最大压应力和斜拉杆及环索的最大拉应力均有所减小。Nowadays seismic response analysis for most of suspen-dome structures is assumed their foundations constrained by rigid boundary conditions. However,the soil around the foundation may be deformed when the soil excited by the earthquake wave. In order to clarify the real seismic performance of a suspen-dome structure under earthquake excitation,a soil-structure interaction（ SSI） model of suspen dome structure with 92 m span was established,which was simulated by S-R model. The natural dynamic characteristics and seismic response of the structure were analyzed. The results showed that the nature frequency of the suspen-dome structure decreases significantly considering SSI. The maximum compressive stress of the members and the maximum displacement of the joints of the upper-shell of suspen-dome structure increased sharply while the maximum stress of struts,steel tie rods and cables decreased to some extent.

关 键 词：弦支穹顶结构 土-结构相互工作 S-R(Swaying-Rocking)模型 自振特性 地震响应 

分 类 号：TU399[建筑科学—结构工程]