摘要
为分析隔震结构竖向连续倒塌非线性动力响应影响因素,基于备用荷载路径法原理,采用考虑构件失效时长的竖向非线性动力分析方法,对隔震结构进行了倒塌动力响应分析。此外,依据冗余度指标,提出定量评估隔震结构竖向连续倒塌鲁棒性方法,利用该方法分析了不同跨度、不同层高的损伤隔震结构三种鲁棒性指标,判断结构在遭遇原设计荷载时是否会发生竖向连续倒塌。研究结果表明:随失效时间增长,结构的倒塌动力效应减弱;隔震结构鲁棒性随层高的增大而降低,随结构跨度的增大而降低;不等跨隔震结构当其长跨边柱隔震支座失效时,更易发生竖向连续倒塌。
Based on the alternative load path method,the vertical dynamic analysis method considering the failure time of the member is used to analyze the collapse dynamic response of the isolated structure.In addition,a robust method for quantitatively evaluating the vertical progressive collapse of the isolated structure based on the redundancy index is proposed.Through analyzing and contrasting the three robustness indexes of the damaged isolation structure under different span and height conditions,it is predicted that whether the vertical progressive collapse of the damaged isolation structure will occur with the original design loading,and the influence of span and height on the vertical progressive collapse ability of the isolation structure is revealed.The results show that the collapse dynamic effect of the structure decreases with the failure time increases.The robustness of the isolation structure decreases with the increase of the height and the structural span.When the support of long-side span fails,it is more prone to vertical progressive collapse.
作者
闵春伟
Min Chunwei(China Municipal Engineering Northwest Design and Research Institute Co., Ltd., Lanzhou Gansu 730000, China)
出处
《城市建筑》
2019年第8期24-27,共4页
Urbanism and Architecture
关键词
连续倒塌
倒塌动力响应
鲁棒性
IDA分析
隔震结构
progressive collapse
collapse dynamic response
robustness
IDA
isolation structur
