Influence Of Connectionon Seismic Performance Of Steel Coupling Beams In Thin Steel Plate Composite Shear Wall

This article in the new sheet steel fabricated composite shear wall based on the experimental study,further deepening of the new steel plate composite shear wall with steel beam node connection,complete the three specimens of quasi static test,the node connection measures across the high coupling beam and steel ratio on the failure process and failure mechanism of the specimens,on seismic performance of hysteresis curve and stiffness degradation and shear deformation are analyzed.At the same time,ABAQUS software is also used in this paper to conduct finite element analysis on the application of shear wall-steel girder specimens and joints connected in multilayer structures under horizontal reciprocating loads.This paper mainly draws the following conclusions:(1)The failure of SCB1 is that the steel plate of the wall limb at the joint of the floor is gradually developed from the initial drum to tear to form an opening,while the flange is detached from the joint of the wall limb;The failure location of SCB2 is at the welding seam of the steel girder flange and the wall limb.SCB3 shear failure occurs,the web is cut along the middle stiffener,the middle web is x-shaped uplift,web and flange weld tear.At the same time,severe bending deformation occurred near the upper flange and the floor plate transferred the plastic hinge region of the steel link beam.(2)The beam flange weld of specimen SCB2 bears low cyclic reciprocating loads directly.Once welding defects and stress concentration exist,brittle fracture is easy to occur under the joint action of cyclic stress,tensile stress and plastic strain.The brittle fracture of SCB2 flange weld can be solved through reasonable design and optimization process,so as to improve the bearing capacity and seismic performance of specimens.(2)The research results show that the steel coupled beam is suitable for connecting the shear wall limb of the thin steel plate.The smaller the span height ratio of the specimen,the fuller the hysteresis curve,the larger the initial lateral stiffness of the specimen,the higher the peak load,the smaller the corresponding peak displacement,the better the ductility,and the faster the stiffness degradation rate in the later period.For specimens with large span height,the loading displacement is larger at the same displacement Angle,so the total energy consumption is also larger.The ratio of span to height is an important factor affecting the shear deformation of rigid beam.The smaller the ratio of span to height is,the larger the shear deformation of specimen is,and the more prone the web is to shear failure.(3)The initial stiffness of the specimens with the floor structure and the end plate structure is the same.But the specimens with the floor structure have larger peak bearing capacity,fuller hysteresis curve and larger area.The ductility,deformation and energy dissipation capacities of the specimens constructed with floor plates are stronger than those of end-plate specimens.Therefore,structurally,the rib joint specimen is due to the end plate joint specimen.(4)The shear wall limb of the composite steel plate coupled with steel coupler can give full play to the seismic performance of the double defense line,which indicates that the shear wall of the composite steel plate coupled with steel coupler is a type of shear wall with "strong wall and weak beam",which meets the design requirements of "strong shear and weak bend".