Experimental Study On The Solution Of Perpendicular Joints Between Steel Beam And Concrete Shear Wall

At present, composite structures with steel and concrete have been widely applied to the high-rise buildings in China. The composite structure has the merits of steel structures and concrete structures,which can make full use of advantages of steel and concrete, such as high strength, good ductility, excellent energy dissipation and applicability of architectural function. However, there is little research on the seismic performance of perpendicular joints between concrete wall and steel beam, and the present specification also has some insufficiencies to design the perpendicular joints.The paper designs and creates perpendicular joints between concrete wall and steel beam, which includes the group (three specimens) by beam anchorage joint and the group (three specimens) of90°hook anchor joint. The experiment under the axial load in the top wall and cyclic loading in the ends of beam is made on the joints, which are designed for the principles "strong beam and weak wall, while weak joint". The experimental and nonlinear finite element analysis on the seismic performance of the joint is conducted in the paper. Firstly, the experiment under low period cyclic loading is made on two different kind of joints, in order to describe the experiment process and calculate the hysteretic curves and skeleton curves; Secondly, comparison among the experimental results of six specimens which include failure modes, hysteretic curves, bearing capacities, rigidity degeneration, ductility, energy dissipation and strain of the main parts are analyzed in the paper. The analysis results show that:The bearing capacity and deformability of the joints with anchoring in the beam are improved considerably and the anchorage performance is enhanced, while the difference of the ductility and energy dissipation among the joints are not obvious. Under the bending moment and axial load, the force in the shear wall is not symmetrical so that the strain of the longitudinal reinforcement and horizontal reinforcement are larger than other parts and there is an effective loading range along the height and width of wall in the zone of gusset plate. The stress in the zone of gusset plate is larger than the stress in the zone far away from gusset plate along the height and width of wall. The buckling failure is appeared in the gusset plate connected the steel beam with shear wall and the failure has a bad effect on the performance of the anchor rebar so it is necessary to take some measures to change the structure; Lastly, after experimental study, this paper using the finite element software ABAQUS to conduct nonlinear finite element analysis to experiment specimens, The analysis results are basically consistent with the experimental results, which verify the reliability of the finite element analysis. On this basis, this paper preliminary analysis the influence factors of bearing capacity and seismic performance of joint including the anchor plate thickness, anchor bar arrangement, axial compression ratio and the strength of concrete, discussion the change of these factors how to influence the seismic performance of the joints.