基于增量动力分析法的内柱失效钢框架连续倒塌研究  

Research on progressive collapse of steel frame after failure of inner column based on incremental dynamic analysis method

作　　者：黑晓丹 孙海峰 王斌 张勤生 朱权秀 朱武权 张满彪 胡隆德 HEI Xiaodan;SUN Haifeng;WANG Bin;ZHANG Qinsheng;ZHU Quanxiu;ZHU Wuquan;ZHANG Manbiao;HU Longde(China State Construction Engineering Corporation AECOM Consultants Co.,Ltd.,Lanzhou 730099,China)

机构地区：[1]中国市政工程西北设计研究院有限公司,兰州730099

出　　处：《建筑结构》2023年第16期6-13,43,共9页Building Structure

基　　金：中国市政工程西北设计研究院有限公司科技研发课题(XBSZKY2320)。

摘　　要：建立钢框架数值模型,采用非线性动力拆除构件法和增量动力分析法研究内柱失效对结构抗连续倒塌机制、传力机制和失效机理的影响及动力增大系数对结构抗连续倒塌能力影响,同时还分析了拆柱时间和楼板对结构抗连续倒塌的影响。结果表明,随着拆柱时间减小,拆柱位置结构最大动力响应呈增大趋势;楼板能够提高结构抗连续倒塌能力;内柱失效后发生结构内力重分布,原本由拆柱位置框架柱承担的竖向荷载均匀分配到其他框架柱,导致拆柱后拆柱位置框架柱轴力减小,隔跨柱的轴力变化明显小于相邻柱,距离拆柱位置越远,柱轴力变化越不明显。最后,总结了内柱失效后,梁、柱结构在梁机制、过渡和悬链线三阶段的受力情况,得出了考虑弯曲、悬链线和空腹效应情况下多层框架的抗力公式。The numerical model of the steel frame was established,and the nonlinear dynamic removing member method and incremental dynamic analysis method were used to study the influence of the failure of the inner column on the structural progressive collapse resistance mechanism,force transmission mechanism and failure mechanism,and the influence of the dynamic increase coefficient on the structural ability to resist progressive collapse.At the same,the influence of column remval time and floor slab on the structural progressive collapse resistance were analyzed.The results show that with the decrease of column remval time,the maximum dynamic response of column removal place shows an increasing trend.The floor slab can improve the structural ability to resist progressive collapse.The internal force redistribution occurs after the failure of inner column,the vertical load originally borne by frame column at the column removal place is distributed to other frame columns,resulting in the reduction of the axial force of frame column at the column removal place after the column is removed,and the axial force change of the other separated span columns is obviously smaller than that of the adjacent columns,the farther it is from the column removal place,the less obvious the change in the axial force of the column.Finally,after the failure of the inner column,the force of the beam-column structure in the beam mechanism,transition and catenary stages were summarized,and considering bending,catenary and effects,the resistance formula for multi-layer frames was obtained.

关 键 词：钢框架 增量动力分析法 内柱失效 连续倒塌 拆柱时间 拆柱位置 

分 类 号：TU391[建筑科学—结构工程] TU317.1