强震作用下K6型空腹球面网壳的动力失效分析  

Dynamic failure analysis of K6 vierendeel reticulated spherical shell under severe earthquakes

作　　者：吴长[1,2] 王秀丽[1,2] 周锟[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《空间结构》2015年第2期60-65,共6页Spatial Structures

基　　金：甘肃省自然科学基金项目(145RJZA029);国家自然科学基金项目(51278236);甘肃省高等学校基本科研业务费专项基金

摘　　要：为了揭示强震下空腹球面网壳结构的动力失效机理,对一个跨度为100m的K6型空腹球面网壳结构进行了不同地震加速度下的全过程动力时程分析.依据已有的B-R动力失稳判定准则和评定网壳结构动力强度破坏行为的方法,研究该结构在强震作用下结构最大位移、进入塑性杆件比例、最大单元相对应变等特征响应指标的变化规律.分析结果表明:K6型空腹球面网壳在破坏之前已经历了较大的塑性发展过程,结构在塑性发展和位形变化的交互作用下产生破坏,其最终破坏形式趋于动力强度破坏.In order to reveal the dynamic failure mechanism of vierendeel reticulated spherical shell under severe earthquakes, the dynamic time-history responses for a 100m-span K6 vierendeel reticulated spherical shell subjected to different seismic acceleration excitations were investigated. According to the B-R criteria for assessing dynamic instability failure and the method of the dynamic strength for assessing the reticulated shell, the curves of several characteristic response indexes are investigated, which include the maximal joint displacement, ratio of plastic elements and the maximal unit relative strain. The results show that the damage of the vierendeel reticulated spherical shell is shown as a sudden increase of displacement response, and there＇s a great plastic development process before the failure appears. The failure of the shell is caused by the increasing interactive actions of the plastic development and deformation and the ultimate failure modes tend to the strength failure.

关 键 词：K6型空腹球面网壳 动力失效 强震作用 时程分析 动力强度破坏 

分 类 号：TU393.3[建筑科学—结构工程] TU311.3