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(1 南昌大學設(shè)計研究院， 南昌 330047； 2 南昌大學建筑工程學院， 南昌 330031)
摘要: 為深入考察現(xiàn)澆樓板對 RC 框架結(jié)構(gòu)抗連續(xù)性倒塌性能的影響，先對一 2 層帶板框架靜力坍塌試驗進行仿真模擬，校核三維實體退化虛擬層合單元模擬分析法的準確性；通過對比空間 4 層框架底層有無樓板的情況，分析了結(jié)構(gòu)在底層為獨立梁格狀態(tài)和肋梁樓蓋狀態(tài)下倒塌過程中的破壞形態(tài)與鋼筋應(yīng)力變化，得出肋梁樓蓋結(jié)構(gòu)中貫通梁因梁板協(xié)同效應(yīng)并未像在獨立梁格中觸發(fā)“懸鏈線”機制；通過改變該空間框架底層板厚的情況，分析了不同板厚模型連續(xù)倒塌過程中不同的破壞形態(tài)與抗力表現(xiàn)，發(fā)現(xiàn)各模型貫通梁格區(qū)樓板均以失效柱為中心呈“花瓣形”薄膜受拉狀態(tài)，隨板厚增加薄膜受拉區(qū)逐漸回攏，應(yīng)力等值線漸變稀疏，結(jié)構(gòu)承載力相應(yīng)提高。
關(guān)鍵詞: RC 框架結(jié)構(gòu)； 連續(xù)性倒塌； 三維實體退化虛擬層合單元； 懸鏈線機制； 花瓣形拉力膜
中圖分類號:TU375 文獻標志碼:A 文章編號:1002￣848X(2022)06￣0061￣08
DOI:10. 19701 / j.jzjg.LS202092
Nonlinear finite element analysis on beam￣slab￣column synergistic progressive collapse resistanceof RC frame considering the effect of cast￣in￣place slabs
JIA Yigang1， ZHAN Mingchen2， WU Guangyu1， AO Juming2， WANG Huibin1
(1 Design and Research Institute， Nanchang University， Nanchang 330047， China； 2 School of Civil Engineeringand Architecture， Nanchang University， Nanchang 330031， China)
Abstract: In order to deeply investigate the effect of cast￣in￣place slabs on the performance of RC frame structure againstprogressive collapse， the accuracy of the simulation analysis method based on degenerated 3D solid virtual laminationelement was verified first through the simulation of the static collapse test of a two￣story frame with slabs. By comparingsituations whether there were floor slabs on the ground floor of a spacial 4￣story frame， the failure form and the stress changeof steel rebars during the collapse process of the structure when the ground floor was a beam￣only grid or a ribbed￣beam floorwere discussed， and it was concluded that the through￣beam in the ribbed￣beam floor had not triggered “ catenary”mechanism like in the beam￣only grid floor due to the beam￣slab synergistic effect. By changing the slab thickness on theground floor of the spacial frame， the failure form and resistance performance of models with different slab thickness wereanalyzed， it was found that slabs within the through￣beam lattice area of each model were in a “ petal￣shaped” tensilemembrane action centered on the failed column； with the increase of slab thickness， the tensile membrane zone graduallyconverges， the stress contours gradually became sparse and the structural bearing capacity increases accordingly.
Keywords: RC frame structure； progressive collapse； degenerated 3D solid virtual lamination element； catenarymechanism； petal￣shaped tensile membrane
∗國家自然科學基金研究計劃項目(51268044)。
第一作者:賈益綱，碩士，教授，博士生導(dǎo)師，主要從事混凝土結(jié)構(gòu)設(shè)計理論及大型復(fù)雜結(jié)構(gòu)防災(zāi)減災(zāi)研究，Email: jiayigang999@ sina.com。
[引用本文] 賈益綱，詹鳴晨，吳光宇，等. 考慮現(xiàn)澆樓板影響的 RC 框架梁板柱協(xié)同抗連續(xù)性倒塌非線性有限元分析[J]. 建筑結(jié)構(gòu)，2022，52( 6):61￣68. JIA Yigang， ZHAN Mingchen， WU Guangyu， et al. Nonlinear finite elementanalysis on beam￣slab￣column synergistic progressive collapse resistance of RC frame considering the effect of cast￣in￣placeslabs[J]. Building Structure，2022，52(6):61￣68.
