Research on shear behavior and bearing capacity of box joints for a RC column-steel beam
LIU Liping1,2，XIAO Xian1,2，ZHENG Xinyao3，WANG Zhijun1，LI Yingmin1,2，LI Ruifeng1,2，DENG Fei1,2
1.School of Civil Engineering, Chongqing University, Chongqing 400045, China;
2.Key Laboratory of Earthquake Resistance and Disaster Prevention for Engineering Structures, Chongqing University, Chongqing 400045, China;
3.Chongqing Poly Real Estate Development Co., Ltd., Chongqing 401147, China
Abstract：In order to study the shear capacity of reinforced concrete column-steel beam (RCS) box-type joints, based on the results of quasi-static tests, the shear mechanism of internal steel webs, external steel side plates and concrete in the joint area and their contribution to the shear capacity are analyzed by theory and finite element method, and the calculation formula of shear capacity of the joints is derived. The shear force is jointly borne by the internal steel webs, the external steel side plates and the diagonal bar mechanism formed by the inner and outer concrete. The internal steel webs and the inner concrete are the main bearing components, and the contribution to the shear capacity of the joint is about 50% and 30% respectively. Based on the characteristics that the shear force of the outer steel side plates is small and the ratio of the bearing capacity of the inner steel webs to that of the outer steel side plates is relatively stable, the amplification factor β is introduced to reflect the contribution of the outer steel side plates to the shear capacity, and the shear capacity formula of the steel components is derived; based on the principle of concrete diagonal strut and the contribution of the inner and outer concrete to the shear capacity of the joints, the shear capacity formula of the concrete components is derived. Finally, steel components, the inner concrete in the ultimate bearing capacity state, and the outer concrete which have not yet yielded are superimposed to establish the shear capacity calculation formula of RCS box-type joints. The calculation results are in good agreement with the results of quasi-static tests and finite element analysis results.
Key words: hybrid structure; RCS joints; finite element analysis; shear behavior; shear bearing capacity
刘立平1,2，肖闲1,2，郑歆耀3，王志军1，李英民1,2，李瑞锋1,2，邓飞1,2. 钢筋混凝土柱-钢梁盒式节点抗剪机理及抗剪承载力计算[J]. 振动与冲击, 2022, 41(24): 11-18.
LIU Liping1,2，XIAO Xian1,2，ZHENG Xinyao3，WANG Zhijun1，LI Yingmin1,2，LI Ruifeng1,2，DENG Fei1,2. Research on shear behavior and bearing capacity of box joints for a RC column-steel beam. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(24): 11-18.
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