钢筋混凝土框架抗连续倒塌机制研究  

Study on the Progressive Collapse Mechanism of RC Frame Structures

作　　者：李易[1] 陆新征[1] 叶列平[1] 陈适才[2] 

机构地区：[1]清华大学土木工程系,清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100022

出　　处：《建筑科学》2011年第5期12-18,22,共8页Building Science

基　　金：国家科技支撑计划项目(2006BAJ06B06和2006BAJ03A02-01);长江学者和创新团队发展计划资助项目(IRT00736);“城市与工程安全减灾教育部重点实验室开放基金项目;北京市重点实验室开放基金项目”(EESR2010-03)

摘　　要：通过非线性动力拆除构件法,对不同抗震设防水平下的典型钢筋混凝土(RC)非整体现浇楼板框架和整体现浇楼板框架的抗连续倒塌机制进行分析。首先,总结出了两种典型连续倒塌模式并进行了讨论,发现框架柱的抗侧刚度不足将导致连续倒塌在水平向的传播。然后,通过分析框架在不同部位发生初始破坏后的力学响应,研究了框架结构不同部位的框架梁抗连续倒塌贡献,结果显示所有的框架梁都可以通过梁机制发挥抗连续倒塌承载力,但是只有两端具有足够水平支座约束框架梁才能发挥其悬链线机制的承载力。最后,通过研究框架结构的连续倒塌规律,分析了楼板和抗震设防烈度对框架抗连续倒塌性能的影响。The progressive collapse（PC） mechanism of two typical non-integrated slab and integrated cast-in-situ slab reinforced concrete（RC） frames,with different seismic fortification levels,is analyzed by the nonlinear dynamic alternate path（AP） method.Firstly,the two representative PC modes are summarized and it is found that the insufficient lateral stiffness of columns leads to propagation of collapse in horizontal direction.And then,the PC resisting contribution of framed beams at different locations of the frames is studied by analyzing the mechanical response of the frames with initial damage occurring at different locations.Results indicate that all beams are able to provide PC resistance by beam action but only the continuous beams,with enough horizontal constraint at both ends,are able to provide PC resistance by catenary action.At last,the influence of slabs and seismic design on PC resistance of the two RC frames is discussed by analyzing the PC law of RC frames.

关 键 词：混凝土框架 抗连续倒塌机制 非线性动力拆除构件分析 

分 类 号：TU375.4[建筑科学—结构工程] TU311.4