2011钢框架连续倒塌的模拟方法研究_谢甫哲.pdf

第28 卷第10 期 Vol.28 No.10 工 程 力 学 2011 年 10 月 Oct. 2011 ENGINEERING MECHANICS 34 文章编号：1000-4750(2011)10-0034-07 钢框架连续倒塌的模拟方法研究 * 谢甫哲， 舒赣平 (南京东南大学土木工程学院，南京 210096) 摘 要：对钢框架结构在进行连续倒塌分析时的计算模型进行了研究。以1 个两层两跨平面钢框架为例，分别建 立了传统的理想刚接杆系模型和实体模型，采用抽柱法对2 种模型进行了动力非线性分析，比较分析结果得出传 统的理想刚接杆系模型由于没能考虑节点的受力与塑性变形，不能准确地反映结构连续倒塌的动力效应，使得结 构抗连续倒塌性能评估结果偏不安全。对引入节点机械模型的平面钢框架进行连续倒塌分析，其计算结果与实体 模型的结果接近，可较准确地反映结构抗连续倒塌性能，且耗时远小于实体模型的计算时间。建议对框架结构进 行连续倒塌分析时采用引入节点性能的杆系模型。 关键词：连续倒塌；机械模型；钢框架；刚性梁柱节点；非线性动力分析 中图分类号：TU391 文献标志码：A RESEARCH ON THE MODEL METHOD OF PROGRESSIVE COLLAPSE ANALYSIS OF STEEL FRAME STRUCTURES * XIE Fu-zhe , SHU Gan-ping (Department of Civil Engineering of Southeast University, Nanjing 210096, China) Abstract: The simply modeling method of progressive collapse analysis is investigated. The traditional beam element model with absolutely rigid or pinned joints and a solid model are established according to the analysis example which is a 2-storie and 2-bay planer steel frame. The progressive collapse analysis results of the models indicate that the traditional beam element model can not accurately reflect the dynamic effect of the structure because the plastic deformation can not be considered by the idealized joints, and the assessment produced by the traditional beam element model is unconservatice. The analysis results produced by the beam element model introducing a joint mechanical model are very close to that of the solid model of the planner steel frame, while the time consumed by the former is much less than that