Experimental Study On Multi-layer Self-centering Steel Frame Structure System Using Energy Dissipation Of A Perforated Steel Plate Shear

The self-centering steel frame structure with steel plate shear wall combines the energy dissipation capacity of steel plate shear wall with the centering performance of self-centering frame.Under the action of earthquake,the main structure can be protected from damage and the post-earthquake repair cost be saved.The self-centering steel frame structure of round-holes perforated steel plate shear wall(abbr,SC-RPSPSW)is an improved form of the self-centering frame structure with the steel plate shear wall,regular round-holes perforation on the wall can alleviate the large out-of-plane buckling deformation of the shear wall caused by tension and pressure action in the process of shearing,and give full play to its energy dissipation capacity.In this paper,the seismic performance of SC-RPSPSWs is studied,a series of single-span reduced scale 1:2 hollow frame and SC-RPSPSWs are tested,the influence of different design parameters on energy dissipation and centering performance of the structure is analyzed.The main research contents of this paper are as follows:(1)The theoretical lateral stiffness of round-holes perforated steel plate shear wall is deduced by using the theoretical stiffness of steel plate shear wall.And the initial elastic stiffness of self-centering frame of perforated steel plate shear wall is deduced.According to the test results,the error between the theoretical value and the measured value is stably within 20%.(2)Five SC-RPSPSW are designed and tested.The strain gauge is used to detect the stress of the steel frame to ensure that the frame is always in the elastic stress range.From the hysteresis curve,skeleton curve,prestress change,Mises stress,energy dissipation and centering effect can be analyzed.Resulta showed that the bearing capacity of SC-RPSPSW is slightly lower than the self-centering steel frame structure with no-perforated steel plate shear wall,but the energy dissipation capacity and centering performance are bette.The SC-RPSPSW is more prominent,and the overall seismic performance of the structure is improved.(3)Five kinds of embedded steel plate shear walls with different round-hole perforations were designed,and the parameters were studied by replacing the embedded steel plate shear walls.The strain gauge is used to detect the stress of the steel frame to ensure that the frame is always in the elastic stress range.It is found that the perforation ratio of steel plate shear wall has a great influence on the bearing capacity of framestructure.The smaller the perforation of the embedded wallboard,the smaller the stiffness of the wallboard,the larger the bearing capacity of the structure.At the same time,the lower the perforation rate of the steel plate shear wall,the greater the energy consumption of the structure.The size of perforation diameter of steel plate shear wall has little effect on the centering performance of the structure,and the energy dissipation capacity of the structure decreases with the increase of perforation diameter of the wall plate.The distribution of round-holes in the form of diamond-shaped interior and exterior tangential arrangement around the center of the wallboard symmetrically weakens the bearing capacity of the structure seriously.The uniform square distribution of round-holes in the wallboard has a significant effect on the energy dissipation capacity of the structure,while the wallboard with the spacing array of round-holes has a negative impact on the energy dissipation of the structure.