江南大学体育馆网壳结构静动力特性分析  

Static and Dynamic Characteristic Analysis for Reticulated Shell Structure of Jiangnan University Stadium

作　　者：周太全[1] 华渊[1] 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122

出　　处：《江南大学学报（自然科学版）》2009年第3期335-339,共5页Joural of Jiangnan University (Natural Science Edition)　

摘　　要：大跨度钢屋盖结构在大型公共建筑中应用较普遍,且该结构对变形的要求较为严格。为分析江南大学体育馆网壳结构施工结束后的静力变形和动力特性,采用大型有限元程序建立了该屋盖网壳结构的三维有限元模型,分别对网壳结构在自重和预应力张拉弦的张拉荷载作用、温度变温作用下的静力变形进行分析。结果表明:采用橡胶垫板支座的网壳结构杆件受力分布均匀,弦杆内力均位于屈服极限之内;张拉弦施工对屋顶变形的影响较大,而变温作用对屋盖变形影响不大。另外,分别对该屋盖结构在橡胶垫板支座和固定支座约束下的结构动力学特性分析表明,结构的前三阶模态为水平和转动刚体模态,这种模态减小了结构因振动而产生的杆件变形,对结构受力有利。The long span steel roof structure is widely applied in the public buildings. The requirement for the long span steel structure is strict. To investigate the static internal force distribution and dynamical characteristic after the shell structure construction, the 3D finite element model for the shell structure is developed based on the general purpose finite element software. The static deformation under the self weight, prestressed loading on the prestressed chords, temperature variations is analyzed using the finite element static analysis. The static analysis results show that the internal force distribution is even in the reticulated shell structure with lower elastic internal force. The prestressed chords construction has great influence on the roof structure vertical displacement while the temperature variation does not play great role in the roof structure deformation. Besides, the comparative dynamic characteristic analyzed for the roof structure using the rubber layer elastic supports and the fixed supports is performed. The analytic results show that the three lower modals are dominated by the translational and rotational modals, which decreases the structural internal force distribution under vibration loads.

关 键 词：网壳结构 静力变形 动力特性 有限元 橡胶垫板支座 

分 类 号：TU393.3[建筑科学—结构工程]