考虑边柱失效位置和根数影响的钢框架结构抗倒塌性能研究  

Collapse resistance of steel framed-structure considering the effects of failure location and number of edge columns

作　　者：张惊宙 李国强[2,3] 冯然 陈锐 Zhang Jingzhou;Li Guoqiang;Feng Ran;Chen Rui(Harbin Institute of Technology,Shenzhen,Shenzhen 518055,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Civil Engineering Disaster Prevention,Tongji University,Shanghai 200092,China)

机构地区：[1]哈尔滨工业大学(深圳),深圳518055 [2]同济大学土木工程学院,上海200092 [3]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《土木工程学报》2021年第8期67-74,共8页China Civil Engineering Journal

基　　金：十三五国家科技重大专项(2016YFC0701203)。

摘　　要：文章针对2个带楼板的钢框架结构,分别开展了静力移除边柱试验和动力移除边柱试验,得到了边柱移除过程中结构关键部位的位移和应变响应;同时基于能量平衡原理,对比了2次试验中边柱移除处的竖向位移。结果表明:动力移除边柱时,结构的最大位移比静力情况大60%;能量平衡原理由于忽略了应变率和阻尼对结构动力响应的影响,基于其建立的等效动力荷载-位移曲线偏保守但合理。此外,基于经验证的有限元分析,文章还研究了边柱失效位置和根数对结构抗倒塌性能的影响,发现角柱和边缘边柱同时失效时对结构产生的不利影响最大。In this work,two steel framed-structures with slabs were tested.One frame was statically tested for the removal of edge-column and the other was dynamically tested for the sudden removal of edge-column,so that the displacement and strain responses of the structure during the column-removal process can be obtained.Moreover,based on the principle of energy conservation,the vertical displacements at the column-removal location in the two tests were compared.The maximum displacement of the structure for sudden column removal was 60%larger than that of the static case.The principle of energy conservation ignores the effects of strain rate and damping on the dynamic behavior of the structure.It is conservative and reasonable to establish the equivalent dynamic load-displacement curve by using the principle of energy conservation.Additionally,based on the verified finite element analysis,the effects of the location and number of edge-column removal on the collapse resistance of the structure were studied.It was found that the simultaneous failure of corner and edge columns had the most adverse effect on the structure.

关 键 词：钢框架 边柱 瞬时失效 倒塌 薄膜效应 悬链线效应 

分 类 号：TU391[建筑科学—结构工程]