Study On Seismic Behavior Of Grid-Type Steel Tube-Concrete Composite Shear Walls

As a new kind of lateral resistance member, steel plate-concrete composite shear wall is developed in recent years. It combines the advantages of both steel and reinforced concrete structure, and it has the strong points, such as good ductility, good energy dissipation ability, etc. Meanwhile it can reduce the thickness of shear wall and the weight of structure. A new type of composite shear wall with grid-type steel tube and infill concrete (CSW) is proposed in this thesis. The mechanical behavior and seismic performance of CSW are studied by numerical simulation method, experimental method and theoretical analysis. The main research work is as follows:CSW is created in nonlinear finite element software ABAQUS. Then the mechanical behavior including load bearing capacity, deformation capability, energy dissipation capacity, ductility and etc. were analyzed systematically. As a comparison, the finite element model of traditional RC structural wall is also created. When comparing the of the two types of shear wall, CSW shows obvious advantage.One CSW specimen is experimented under low cycle loading in order to study its load bearing capacity, deformation capability, ductility and energy dissipation capacity. According to the test data, the hysteresis curve and skeleton curve are plotted. The grid-type steel and infill concrete work together so that this new type of composite shear wall can combine both the advantages of steel and concrete. The experiment results show that CSW has good energy dissipation capacity and ductility under low cycle loading. Its hysteresis curve is fool and its displacement ductility ratio is up to 8.0The accuracy of calculated results was validated by comparing with the experimental results. Then some impact parameters of seismic behavior of CSW are also discussed. On the basis of the theoretical analysis and experimental data, restoring force model of CSW is presented by fitting method. Empirical formulas of characteristic parameters in theoretical skeleton curve are put forward. The seismic behavior of the concrete-filled steel tube frame and CSW structural system is studied by EPDA&PUSH program of PKPM software. The results prove that CSW shows good mechanical behavior when used in high-rise buildings.