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（1 南昌大學(xué)設(shè)計(jì)研究院， 南昌 330047；  2 南昌大學(xué)建筑工程學(xué)院， 南昌 330031）

［摘要］現(xiàn)澆樓板對(duì)RC框架結(jié)構(gòu)的承載性能有影響，準(zhǔn)確分析考慮樓板貢獻(xiàn)的RC框架結(jié)構(gòu)抗倒塌性能與機(jī)制很有必要。采用基于三維實(shí)體退化虛擬層合單元理論的非線性有限元分析程序VFEAP，先分別對(duì)水平荷載作用下2層RC框架抗側(cè)試驗(yàn)?zāi)Ｐ秃拓Q向荷載作用下2層RC框架底層中柱失效抗倒塌試驗(yàn)?zāi)Ｐ瓦M(jìn)行梁板柱空間協(xié)同非線性分析，仿真模擬結(jié)果與試驗(yàn)結(jié)果吻合良好，表明分析程序具有很好的適用性；  據(jù)此，再對(duì)10層九宮格平面RC框架結(jié)構(gòu)進(jìn)行底層內(nèi)柱失效情況下豎向連續(xù)性倒塌全過程仿真分析與研究，根據(jù)分析結(jié)果得出，失效柱貫通十字梁格區(qū)域，幾乎全部樓板始終處于偏心受拉狀態(tài)，明顯呈現(xiàn)板膜偏拉受力機(jī)制；  與失效柱相連的貫通梁因樓板參與受力未出現(xiàn)壓拱和懸鏈線機(jī)制，始終以梁抗彎機(jī)制為主，局部區(qū)域處于偏心受拉狀態(tài)，可為完善梁板柱協(xié)同抗倒塌機(jī)制研究提供參考。

［關(guān)鍵詞］RC框架；  梁板柱空間協(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)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)17-0070-08

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

JIA Yigang1, MAO Yunxue2, WU Guangyu1, LIU Pengcheng2, WANG Huibin1

(1 Design and Research Institute, Nanchang University, Nanchang 330047, China; 2 School of Civil Engineering and Architecture， Nanchang University， Nanchang 330031， China)

Abstract: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.

Keywords:RC frame; beam-slab-column space interaction; progressive collapse; three-dimensional solid degenerate virtual laminated element; nonlinear analysis

*國家自然科學(xué)基金研究計(jì)劃項(xiàng)目（51268044）。

作者簡介：賈益綱，碩士，教授，博士生導(dǎo)師，Email:jiayigang999@sina.com;通信作者：吳光宇，博士，教授級(jí)高級(jí)工程師，Email：wuguangyu@ncu.edu.cn。