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《Sichuan Building Science》 2013-02
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Experimental study and analysis on specimens of steel secondary beam inserted in reinforced concrete girder of frame structure

YU Qiong,WU Ming,ZHAO Xingzhuang,LU Zhoudao,YU Jiangtao(Institute of Structural Engineering and Disaster Reduction,Tongji University,Shanghai 200092,China)  
Test of two specimens(four different joints) of steel secondary beam embedded in reinforced concrete girder in frame structure and one specimen with steel cantilever beam embedded in reinforced concrete girder under static load were conducted.The steel beam up-region was pulled out because of the concrete cracks caused by the moment,shear and torsion at the upper zone of the concrete beam near the steel beam end,and embedded capacity of joints failed.Lacking restraint of concrete and the reinforcement of steel bar in the concrete slab and catenary action of restraint steel beam,the capacity of steel cantilever beam is much smaller than other beams.The restrain action of specimen-600 is smaller than specimen-900.Models for internal force analysis and strain distribution of joints are analyzed.The horizontal internal force and vertical force are considered separately during calculation and analysis process.The research on bending-shearing correlation of joints is studied while the horizontal force isn't taken into account.Results show that the non-dimensional moment varies linearly with the non-dimensional shear force.By investigating the moment and shear force variation,the stress state of the bar in the slab and the boundary concrete under the steel secondary beam is identified.In the end,practical design formula and method is proposed.
【CateGory Index】: TU375.1
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