| This paper proposes a new type of composite steel plate shear wall structure,which adopts uplift restricted-slip free connector to improve the structural property of conventional composite steel plate shear wall.The uplift restricted-slip free connector consists of shear connector and rubber material.The rubber is wrapped on the outside of the shear connector,and then both of them are encased into the concrete.However,a gap is provided between the concrete panel and the boundary frame members so that the concrete panel only exerts a buckling-restraining effect on the infill steel plate.In addition,the interior of the H-shaped steel column in the surrounding frame is also filled up with concrete,and the transverse rebar used to restrain the concrete is arranged horizontally inside the concrete and welded on the flanges of the profile steel.This novel composite column is called PEC.Compared with the buckling-restrained steel plate shear wall,the concrete cover plate of the new composite steel plate shear wall does not need to be prefabricated and the construction is simple.Besides,composite column has high bending rigidity and axial compression stiffness which can effectively suppress the local buckling of profile steel column and then improve the overall deformability.In this paper,the structural performance of the novel composite steel plate shear wall structure is studied.The main research contents are as follows:(1)The quasi-static test of the new structure under repeated low-cycle lateral load was carried out,and an unstiffened specimen was added for comparison.The test results of the two specimens are compared to study the bearing capacity,stiffness,energy consumption,ductility,deformation and failure mode of the novel structure.(2)Based on the results of the experimental study,the two experimental specimens are simulated by the finite element software ABAQUS 6.12.The established finite element model adopts the constitutive models of Combined Hardening and Ductile Damage to stimulate the inelastic property of the steel material while Concrete Damaged Plasticity is used for the concrete material.Besides,the constitutive model of Hyperelastic is applied for the rubber material.The test results are used to verify the accuracy of finite element simulation.The constitutive model of Combined Hardening used for the steel material can simulate the pinching effect of the hysteresis curve of the unstiffened steel plate shear wall.The damage constitutive models of steel and concrete can accurately simulate the bearing capacity degradation of the composite structure during the post-peak loading stage.(3)Theoretical study and finite element analysis on the structural properties of PEC columns in steel plate shear wall structure are carried out,and the effective bending stiffness of the PEC column and the maximum in-plane deflection value are derived.It is proved that the concrete in the column can improve the overall bearing capacity and ductility of the steel plate shear wall structure.Besides,the transverse rebars facilitate the collaborative work of H-shaped profile steel and concrete,which significantly improve the bending stiffness of the composite column,and effectively suppress the inward deformation of the frame column in the unstiffened steel plate shear wall.(4)The difference on the structural behaviors of this novel composite steel plate shear wall and conventional buckling-restrained steel plate shear wall are studied.The design methods for the height-thickness ratio of the infill steel plate,the height-diameter ratio of the rod,the size of the end plate,the thickness of the rubber cover,the thickness of the concrete panel and the spacing of the connectors were obtained.An extensive parametric study is also performed to verify the theoretical design formula and evaluate the construction measurements. |
PDF Full Text Request