Study On Seismic Performance Of The Sheer Wall Composed Of Steel Plate And Joint-row Concrete Filled Steel Tube

As ultra-high-rise and high-rise buildings are widely applied, it has become a concerned issue at home and abroad to improve the seismic performance of shear wall. The sheer wall composed of steel plate and joint-row concrete filled steel tube is presented in this paper,which is constructed in the form of: double steel plates arranged in parallel, a hollow interlayer between double steel and concrete-infilled steel tubes uniformly placed in the hollow interlayer. The steel pipes are fixedly connected to the double steel plates, and top beams are placed at the top of the double plates. The top beams are fixed to the top of the pipe.The double steel plates embedded stiffener are welded with the joint-row concrete filled steel tubes to form a unified whole. The seismic performances of composite shear walls are discussed by the experimental study and the finite element analysis. The main research works are as follows:(1) Three sheer walls composed of steel plate and joint-row concrete filled steel tube are designed and made in this study with parameters of the intercolumniation(clear spacing changes from 1d to 3d, in which d is the diameter of steel pipe). An ordinary reinforced concrete shear wall is designed as a comparison. The Low cycle loading test is used to study the seismic performance of these composite shear walls.(2) Based on the test results, the failure mode, hysteretic curves, skeleton curves,ductility coefficient, stiffness degradation and strength degradation, energy dissipation behavior, strain of steel pipes and steel plates are analyzed. The results showed that the failure modes of the sheer walls composed of steel plate and joint-row concrete filled steel tube are bending failure. The plates at the bottom of walls are severely buckling, and the concrete pipes of the end-column foot are local buckling. The seismic behavior of these composite shear walls was superior to reinforced concrete shear wall. The bearing capacity of this type of composite shear walls is improved significantly. When the intercolumniation is reduced to(5/3) d, it can significantly improve the ductility and energy dissipation of the composite shear wall. Thereby degradation stiffness and strength degradation can be slowed down, but when the intercolumniation is continued to reduce, the ductility and energy dissipation of the composite shear wall will increase slowly.(3) Using ABAQUS to establish a finite element model adapted to the new composite shear wall, the level of monotonic loading with the specimen is simulated. Comparison of experimental results and simulation results, the results show that the simulated curves can match the measured curves. Changing the parameters of axial compression ratio in the finite element model, the results show that this type of shear wall exhibits good strength and ductility at 0.2 to 1.0 axial compression ratio.(4) The initial stiffness formula for designing the sheer wall composed of steel plate and joint-row concrete filled steel tube is given in this dissertation. According to the test results and finite element analysis, the influencing factors of these composite shear wall under horizontal loading are analyzed. Finally, some recommendations to the seismic design of construction are presented.