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（1 南昌大學(xué)設(shè)計(jì)研究院， 南昌 330047； 2 北京北國(guó)建筑工程有限責(zé)任公司， 北京  100068； 3 宜春碧桂園投資有限公司， 宜春 336000）

［摘要］采用三維實(shí)體退化虛擬層合單元非線性有限元分析法，考慮梁板柱空間協(xié)同效應(yīng)，經(jīng)對(duì)一單層2×2跨RC空間板柱結(jié)構(gòu)中柱失效倒塌試驗(yàn)?zāi)M分析并與試驗(yàn)結(jié)果對(duì)比之后，分別對(duì)三種不同抗震設(shè)防RC空間框架結(jié)構(gòu)模型進(jìn)行連續(xù)性倒塌非線性仿真分析，得出隨抗震設(shè)防烈度提高，框架結(jié)構(gòu)抗連續(xù)性倒塌的空間剛度增大，倒塌模式從“緩變型”向“陡變型”轉(zhuǎn)變；抗震設(shè)防烈度越高，結(jié)構(gòu)豎向抗連續(xù)性倒塌能力越強(qiáng)；樓板膜效應(yīng)延緩了梁懸鏈線階段的出現(xiàn)，而框架梁對(duì)樓板膜應(yīng)力機(jī)制和懸鏈面機(jī)制起到加強(qiáng)作用，樓板與框架梁協(xié)同工作在懸鏈線（面）階段整體提高豎向抗連續(xù)性倒塌能力等研究結(jié)論。

［關(guān)鍵詞］RC框架； 梁板柱協(xié)同； 連續(xù)性倒塌； 三維實(shí)體退化虛擬層合單元； 非線性分析

中圖分類號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*國(guó)家自然科學(xué)基金資助項(xiàng)目（51268044）。

通訊作者：李寰，碩士，Email: wddptwdlh@126.com。