Seismic Design And Performance Of Self-centering Steel Plate Shear Walls With Slits

Steel plate shear walls with slits(slit walls,hereinafter)are characterized by in-plane bending deformation and high ductility.The lateral stiffness and ultimate bearing capacity can be adjusted independently by changing parameters.By reasonable design,pre-buckling yield can be realized and the energy dissipation ability can be remarkable in the meantime.In addition,the slit walls only need to be connected with the beams through connecting pieces,which will not increase additional burden of the column and exhibit great flexibility in seismic design.Therefore,it is of great significance to study the self-centering structure which use steel plate shear walls with slit as energy dissipating element.In this paper,slit walls with good ductility,lateral deformation resisting capability and energy dissipation performance and self-centering steel frames with reset performance are organically combined.Focusing on the excellent characteristics of steel plate shear wall compared to other types of walls.On the basis of the accumulated experimental research and numerical simulation results of steel plate shear walls with slits,theoretical analysis and seismic performance study of the self-centering steel plate shear walls with slits are carried out.A performance-based seismic design method is put forward.Firstly,theoretical analysis of slit walls and self-centering steel frame structure is carried out respectively.As for slit walls,plastic bearing capacity,lateral stiffness and elastic buckling performance are described in detail.The errors of conventional formulas are pointed out and improved formulas are introduced.As for self-centering steel frames,lateral stiffness,hysteretic characteristics and self-centering beam-column joint angle-displacement relationship are selective analyzed.Finally,the hysteretic characteristics of self-centering steel pate shear walls with slits are discussed,and formulas for calculating the lateral stiffness of the steel frame structure are proposed.Secondly,numerical simulation methods of self-centering steel pate shear walls with slits are explored in this paper.One convenient,elaborate and cost-saving modeling method is put forward.By comparing with the results from tests and simulation,it is verified that the finite element modeling method this paper is feasible,which provides reliable evidence for the following analysis of seismic characteristics.Thirdly,a large-scale parametric analysis is carried out on the self-centering steel pate shear walls with slits by changing different geometric parameters.Based on the accumulated research results of steel plate shear walls with slits,the influence of the correlative parameters of slit walls,such as the number of flexural links,the high thickness ratio,the slit parameter b/h,and the correlative parameters of self-centering steel frame,such as span-height ratio,the area and the initial pretension stress of pre-stressed steel strand,the height of beam on the bearing capacity,energy dissipation performance,reset performance and ductility of the whole structure are comprehensively analyzed in this paper.Finally,the performance-based seismic theory is systematically introduced and the characteristics and design methods of performance based seismic design are analyzed next.Direct displacement-based seismic design is proposed for the self-centering steel pate shear walls with slits based on the full understanding of the performance-based seismic theory.Specific performance objectives and design process are given detailed.An example of a specific case is given in the following.The whole process of the design procedures about the case shown in this paper verifies the feasibility and effectiveness of the performance-based design method this paper proposes.