Experiment on the Flexural Behavior of U-shaped Steel-Concrete Composite Beam Cross Joints
In order to solve the problems of interrupting the force transmission path of the U-shaped web at the cross joint of the U-shaped steel-concrete composite beam,the complex force of the joint,and the large amount of on-site welding of the existing welded steel bar transition joint,a new type of joint(LLTC)for the L-shaped connecting plate to transmit the internal force of the steel web was proposed,and the bending performance of the joint was tested.The LLTC consists of sleeves,L-shaped connection plates and threaded rebars installed on the steel web using sleeves and L-shaped connection plates.Compared with the conventional cross joints which transmit internal force of steel web by welded longitudinal transition rebar(WLTR),the LLTC cross joints transfer eccentric internal force within the steel web,and achieve prefabricated connection of joints.Through static loading experiments with four simply-supported ends,this paper investigated the flexural behaviors of the WLTR cross joints and the LLTC cross joints.The influence of the type of longitudinal transition components,the diameter of WLTR,the number of threaded rebars of LLTC and the strength grades of threaded rebars of LLTC on the load-carrying capacity and deformability of beam cross joints were studied.Experimental results showed that the failure modes of WLTR-UCJs are the buckling of steel web and the buckling of top longitudinal rebar,while the failure mode of LLTC-UCJs is the yielding of steel flange.The LLTC cross joints have higher load-carrying capacity and better ductility than WLTR cross joints due to the less pronounced buckling of the compressive zone.
万方数据
维普
