超大跨组合钢网壳结构动力稳定性分析  

STRUCTURAL DYNAMIC STABILITY ANALYSIS OF A SUPER LONG-SPAN COMPOSITE STEEL RETICULATED SHELL

作　　者：刘金鹏[1] 邓长根[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《钢结构》2017年第4期38-43,共6页Steel Construction

基　　金：国家自然科学基金项目(51478330)

摘　　要：网壳结构多为缺陷敏感性结构,当地震发生时,由于强烈的地面运动而迫使网壳结构产生振动,网壳结构在地震作用下产生内力和位移,有可能造成网壳结构破坏或倒塌。在ANSYS中建立底部为协同弹性支承的超大跨钢桁架弦支穹顶组合网壳结构的有限元模型,分析钢网壳结构存在初始缺陷的动力稳定性,着重介绍了动力稳定分析方法、初始缺陷的施加、动力稳定判别准则的理论及应用。通过对钢网壳结构进行动力稳定性分析,总结钢网壳结构动力失稳破坏的形式,找出钢网壳结构真正的薄弱部位,并提出改善、提高钢网壳结构动力稳定性的措施。Reticulated shell structure is sensitive for imperfection,when the earthquake occurs,the reticulated shell structure will produce internal force and displacement because of strong ground motions,which may cause destruction or collapse of the reticulated shell structure.The finite element models of a super long-span reticulated shell composed of steel trusses and a suspendome with cooperative elastic supporting was built in ANSYS,the dynamic stability of the steel reticulated shell structure with initial imperfections was analyzed,and the theory and application of the time-history method,initial imperfections and dynamic stability criterion were emphatically introduced.Through the dynamic stability analysis of the steel reticulated shell structure,the failure types were known,the weak parts were found,and the measures to improve the dynamic stability of the steel reticulated structures were proposed.

关 键 词：时程分析 初始缺陷 动力稳定判别准则 钢网壳 动力稳定性 

分 类 号：TU399[建筑科学—结构工程]