RC框架梁板柱空间协同抗倒塌机制非线性仿真分析  

Nonlinear simulation analysis on anti-progressive collapse mechanism of RC frame beam-slab-column space interaction

作　　者：贾益纲 毛云雪 吴光宇 刘鹏程 王惠宾 JIA Yigang;MAO Yunxue;WU Guangyu;LIU Pengcheng;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]南昌大学设计研究院,南昌330047 [2]南昌大学建筑工程学院,南昌330031

出　　处：《建筑结构》2020年第17期70-77,共8页Building Structure

基　　金：国家自然科学基金研究计划项目(51268044)。

摘　　要：现浇楼板对RC框架结构的承载性能有影响,准确分析考虑楼板贡献的RC框架结构抗倒塌性能与机制很有必要。采用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VFEAP,先分别对水平荷载作用下2层RC框架抗侧试验模型和竖向荷载作用下2层RC框架底层中柱失效抗倒塌试验模型进行梁板柱空间协同非线性分析,仿真模拟结果与试验结果吻合良好,表明分析程序具有很好的适用性;据此,再对10层九宫格平面RC框架结构进行底层内柱失效情况下竖向连续性倒塌全过程仿真分析与研究,根据分析结果得出,失效柱贯通十字梁格区域,几乎全部楼板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因楼板参与受力未出现压拱和悬链线机制,始终以梁抗弯机制为主,局部区域处于偏心受拉状态,可为完善梁板柱协同抗倒塌机制研究提供参考。The cast-in-place floor slab has an impact on the bearing performance of the RC frame structure. It is necessary to accurately analyze the collapse resistance performance and mechanism of the RC frame structure considering the contribution of the floor slab. Using the nonlinear finite element analysis program VFEAP based on the theory of three-dimensional solid degenerate virtual laminated element, firstly, the lateral resistance test model of a 2-story RC frame under horizontal load and collapse resistance test model for failure of the bottom center column of a 2-story RC frame under vertical load were used for the non-linear analysis of the beam-slab-column space coordination. The simulation results were in good agreement with the test results, indicating that the analysis program had good applicability;accordingly, simulation analysis and research of the whole process of vertical continuity collapse in the case of inner column failure at the bottom of a 10-story jiugong grid plane RC frame structure was carried out. According to the analysis results, almost all the floor slabs in the through cross beam lattice area of the failed column are always under eccentric tension, and the force mechanism of slab membrane eccentric tension is obviously present;the through beam connected to the failed column does not show the mechanism of compression arch and catenary due to the participation of the floor slab. The mechanism of beam bending resistance is always the main feature, and the local area is in the state of eccentric tension. It provides a reference for perfecting the research of beam-slab-column collaborative anti-collapse mechanism.

关 键 词：RC框架 梁板柱空间协同 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：TU398.7[建筑科学—结构工程]