Theoretical and experimental study on progressive collapse resistance of concrete filled steel tubular column-composite beam frame under failure condition of middle column
XUAN Wei1,2，WANG Lai2, LIU Changjiang1，XING Guoqi1, YANG Ning3
1.College of Architectural Engineering, Weifang University, Weifang 261061，China;
2.Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology， Qingdao 266590，China;
3.Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China
Abstract：In order to study the collapse resistance of concrete filled steel tubular column-composite beam under failure condition of middle column, based on the analysis of resistance mechanism and influencing factors of concrete filled steel tubular column-composite beam, In this paper, an anti-collapse analysis model of concrete-filled square steel tubular column-composite beam was established.The model takes into account the restraint effect of beam end-column, the difference of bending stiffness of composite beam under the action of positive and negative moment and the bond slip effect between floor and steel beam.The resistance-deformation calculation formula of the model was deduced.In this paper, a 2-span 1-scale concrete-filled square steel tubular column-composite beam frame specimen was designed and the static loading test was carried out.The failure mode, load transfer mechanism and main resistance mechanism of the residual structure after the failure of the middle column were analyzed.The test results showed that the resistance of the structure in the process of collapse has experienced the transformation from the beam mechanism to the catenary mechanism, in which the compression arch mechanism and catenary mechanism can effectively improve the collapse bearing capacity of the structure.Finally, based on the comparative analysis of the theoretical and experimental results, the correction method of the theoretical formula was put forward.
玄伟1,2，王来2，柳长江1，邢国起1，杨宁3. 中柱失效工况下方钢管混凝土柱-组合梁框架抗连续倒塌性能理论与试验研究[J]. 振动与冲击, 2020, 39(3): 76-87.
XUAN Wei1,2，WANG Lai2, LIU Changjiang1，XING Guoqi1, YANG Ning3. Theoretical and experimental study on progressive collapse resistance of concrete filled steel tubular column-composite beam frame under failure condition of middle column. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 76-87.
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