底层不同柱失效RC框架梁板柱空间协同抗连续性倒塌机制非线性仿真分析  

Nonlinear simulation analysis on anti-progressive collapse mechanism of RC frame with removing columns at the bottom considering slab-beam-column interactions

作　　者：敖居明 毛云雪 贾益纲 吴光宇 王惠宾 AO Juming;MAO Yunxue;JIA Yigang;WU Guangyu;WANG Huibin(Design and Research Institute,Nanchang University,Nanchang 330047,China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学建筑工程学院,江西南昌330031 [2]南昌大学设计研究院,江西南昌330047

出　　处：《南昌大学学报（理科版）》2019年第6期591-598,共8页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(51268044)。

摘　　要：采用本课题组二次开发的基于三维实体退化虚拟层合单元理论的非线性有限元分析程序,通过对十层“九宫格平面”RC框架结构分别在底层内柱、边柱和角柱失效情况下梁板柱空间协同竖向抗连续性倒塌全过程仿真分析与研究,得出与失效柱相连的梁格区域楼板几乎始终处于偏心受拉状态,明显呈现“板膜偏拉”受力机制;与失效柱相连的贯通梁主要呈现“梁抗弯”机制,局部处于“偏心受拉”状态,始终未出现“压拱”和“悬链线”特征以及梁板柱呈空间协同竖向传力方式和整体抗倒塌机制等研究结论。Using the nonlinear finite element analysis program based on the degenerated 3-D solid virtual laminated element theory developed by our group to analyze the simulation analysis and research on the vertical progressive collapse resistance of the beam-slab-column space interaction in the case of failure of the inner column,side column and corner column of the ten-story“nine-square grid”RC frame structure,it is concluded that the beam-slab area connected with the failure column is almost always in the eccentric tensions state,and the mechanism of the“slab-membrane eccentric tensions”is obviously presented;The through beam connected with the failure column mainly presents the“beam bending resistance”mechanism,and the partial area is in the“eccentrically tensions”state,and there is no such thing as“pressure arch”and“catenary”characteristics,and the mode of beam-slab-column space interaction vertical force transmission and overall anti-progressive collapse mechanism and so on.

关 键 词：RC框架 梁板柱协同 连续性倒塌 三维实体退化虚拟层合单元 非线性分析 

分 类 号：TU973[建筑科学—结构工程]