多维地震下大跨网格结构倒塌分析与抗倒塌措施  

Collapse modes and anti-collapse measures for long span trusses under multi-dimensional earthquakes

作　　者：黄兴淮[1] 徐赵东[1] 杨明飞[1,2] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]安徽理工大学土木学院,淮南232001

出　　处：《东南大学学报（自然科学版）》2012年第1期109-113,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重大研究计划资助项目(90915004);教育部博士点基金资助项目(6205000009);江苏省自然科学基金资助项目(BK2011063);江苏省普通高校研究生创新人才培养基金资助项目(CXLX_0132);江苏省"333"高层次人才培养工程资助项目

摘　　要：为了研究大跨网架结构的倒塌模式并寻求有效的抗倒塌方法,以显式动力分析方法为基础,模拟了地震下网架结构的倒塌全过程.从倒塌过程归纳出水平地震作用下网架的倒塌模式以强度破坏为主,竖向地震作用下网架的倒塌模式以动力失稳破坏为主.对比了普通网架、加入普通橡胶隔震支座网架和加入多维隔减震支座网架在强震下的倒塌过程.结果表明,普通网架在5.12 s时倒塌,加入普通橡胶隔震支座网架虽未倒塌,但中部凹陷1.01 m,加入多维隔减震支座网架没有发生明显破坏,所以多维隔减震装置能有效地提高网架在强震下的抗倒塌能力.In order to study the collapse mode and find measures to prevent structural collapse of long span trusses,the explicit finite element analysis was performed to calculate the whole collapse process.From the collapse process,the structural collapse mode can be obtained.The collapse mode of the trusses under horizontal earthquake are mainly referred to strength failure,while the collapse mode of the trusses under vertical earthquake are mainly referred to dynamic instability.Three different space trusses subjected to multi-dimensional earthquake were compared,including a normal truss,and a truss with normal rubber bearing,and a truss with multi-dimensional earthquake isolation and mitigation devices（MEIMD）.The normal truss collapsed after 5.12 s,and the truss with normal rubber bearing did not collapse but there was a 1.01 m subsidence at the middle point.However,the truss with MEIMD had little damage.It can be concluded that the MEIMD can enhance the anti-collapse performance under severe earthquakes.

关 键 词：大跨网格结构 倒塌模式 动力失稳 强度破坏 多维隔减震支座 

分 类 号：TU337[建筑科学—结构工程]