U型钢-混凝土组合梁交叉节点抗弯性能试验研究OA

In order to solve the problems of interrupting the force transmission path of the U-shaped web at the intersection 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),which uses 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.LLTC consists of sleeves,L-shaped connection plates and threaded rebars installed on the steel web.Compared with the conventional cross joints(WLTR-UCJs)which transmit the internal force of the steel web by welded longitudinal transition rebar(WLTR),the LLTC cross joints transfer eccentric internal force within the steel web.Through single-point loading experiments with the specimens simply supported at four ends,this paper investigated the flexural behavior 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 was studied.Experimental results showed that the failure mode of WLTR-UCJs was the buckling of steel web and the buckling of top longitudinal rebar,while the failure mode of LLTC-UCJs was the yielding of steel flange.The LLTC cross joints had higher load-carrying capacity and better ductility than WLTR cross joints due to the less pronounced buckling of the web.