斜拉网壳结构构件单元分析及结构动力性能  

Analysis of the Tower-column Element and Cable Element as Well as the Dynamic Properties for Cable-stayed Reticulated Shell Structures

作　　者：沈祖炎[1] 周岱[2] 龚铭[1] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]上海交通大学空间结构研究中心,上海200030

出　　处：《同济大学学报（自然科学版）》2000年第2期127-133,共7页Journal of Tongji University:Natural Science

摘　　要：阐明了斜拉索及塔柱的计算问题 ,数值计算、分析了斜拉网壳结构的动力性能问题 ,并与网壳结构计算结果进行了对比 .计算分析表明 ,斜拉网壳结构频谱密集 ,与网壳结构的对应振型差别很大 ;斜拉索的存在大大提高了网壳结构的刚度 ,明显改变了网壳结构动力性能 ;This paper is focused on the research of the basic members such as the tower-column element and cable element, and the dynamic properties of the cable-stayed reticulated shell structures (CSRS), which is composed of cables, tower-columns and reticulated shell structures (RSS). The nonlinearity of a cable element and a novel simplified linear stiffness matrix of a tower-column element which cable elements link to are investigated. Also, some numerical examples and computational comparisons on both CSRS and RSS are given. Through the computations, it is shown that the frequency spectra of both CSRS and RSS are very dense. That the cables are added to RSS can change the natural frequencies and mode shapes, and enhance the stiffness of RSS significantly. It is clear that the magnitude of the masses exerted on CSRS influences its natural frequencies greatly.

关 键 词：斜拉索 塔柱 动力性能 斜拉网壳结构 空间结构型式 单元刚复 无阻尼自由振动 自振频率 

分 类 号：TU393.301[建筑科学—结构工程]