（1 南昌大学设计研究院， 南昌 330047； 2 北京北国建筑工程有限责任公司， 北京  100068； 3 宜春碧桂园投资有限公司， 宜春 336000）

［摘要］采用三维实体退化虚拟层合单元非线性有限元分析法，考虑梁板柱空间协同效应，经对一单层2×2跨RC空间板柱结构中柱失效倒塌试验模拟分析并与试验结果对比之后，分别对三种不同抗震设防RC空间框架结构模型进行连续性倒塌非线性仿真分析，得出随抗震设防烈度提高，框架结构抗连续性倒塌的空间刚度增大，倒塌模式从“缓变型”向“陡变型”转变；抗震设防烈度越高，结构竖向抗连续性倒塌能力越强；楼板膜效应延缓了梁悬链线阶段的出现，而框架梁对楼板膜应力机制和悬链面机制起到加强作用，楼板与框架梁协同工作在悬链线（面）阶段整体提高竖向抗连续性倒塌能力等研究结论。

［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

中图分类号：TU318文献标识码：A文章编号：1002-848X(2017)21-0067-06

Nonlinear finite element analysis on progressive collapse of RC frame structure considering beam-slab-column spatial synergies

Li Xiaolu1, Li Huan2, Fang Shichao3, Jia Yigang1, Wu Guangyu1

(1 Design and Research Institute,Nanchang University,Nanchang 330047， China; 2 Beijing Beiguo Building Engineering Co.,  Ltd.,  Beijing 100068， China; 3 Yichun Country Garden Investment Co.,  Ltd.,  Yichun 336000， China)

Abstract:The nonlinear finite element method based on degenerated 3D solid virtual laminated element theory was introduced considering spatial synergy of beam-slab-column. After simulation analysis on a collapse test of a single-layer 2×2 span RC spatial slab-column structure with a failure middle column and comparison with the  test results, nonlinear simulation analysis on progressive collapse was conducted respectively on three RC spatial frame structure models with different seismic fortification intensity. Results show that with the seismic fortification intensity increases, spatial stiffness of progressive collapse resistance of frame structure increases, and collapse mode changes from “slow changing type” to “abrupt changing type”; the vertical progressive collapse resistance ability of the structure is high if seismic fortification intensity is high; floor membrane effect delays emergence of beam catenary stage, and frame beam serves to strengthen the floor membrance stress mechanism and catenoid mechanism, and slab-beam spatial synergies overall increases vertical progressive collapse resistance ability in the catenary (catenoid) phase.

Keywords:RC frame structure; beam-slab-column spatial synergies; progressive collapse; degenerated 3D solid virtual laminated element; nonlinear analysis

*国家自然科学基金资助项目（51268044）。

通讯作者：李寰，硕士，Email: wddptwdlh@126.com。