Study On Seismic Behavior Of Coupled Composite Steel Plate Shear Walls Structure Based On External Rib Plate Joint

With the continuous development of China’s urbanization process,more and more high-rise and super high-rise buildings have emerged.In the seismic design of high-rise buildings,there should be multiple seismic defense lines.Composite steel plate shear wall is widely used in high-rise buildings because of its high bearing capacity,large lateral stiffness,convenient construction and other advantages,and steel beam has the advantages of light weight,good ductility and energy dissipation capacity.In this paper,the composite steel plate shear wall and steel beam are connected through the external rib plate.The double-limb composite steel plate shear wall structure based on the external rib plate joint can form multichannel seismic line to meet seismic requirements of buildings.Moreover,the seismic performance of this kind of structure will be studied and the effects of various parameters on structural seismic performance will be analyzed.In this paper,the test specimen SD-2000 WT was selected,and the corresponding finite element model was established according to the test specimen,and the finite element simulation analysis was carried out.By comparing the hysteretic curve,skeleton curve and stress-strain distribution of the two,it is found that the two results are in good agreement,which verifies the rationality of finite element modeling.In this paper,the finite element model of double-limb composite steel plate shear wall structure was established by using the finite element software ABAQUS.The seismic performance of double-limb composite steel plate shear wall structure was studied by analyzing the influences of axial compression ratio of shear wall,deformation characteristics of steel coupled beam,span height ratio of steel coupled beam,thickness of wall limb steel plate and other factors on structural hysteretic performance,ductility,energy dissipation capacity,stiffness degradation.The results show that the structure has good seismic performance,high bearing capacity,full hysteretic curve and it can effectively dissipate seismic energy.When the axial compression ratio was within the range of 0.2-0.6,the specimens with large axial compression ratios had relatively large bearing capacity and energy dissipation capacity,but the ductility is relatively low.At the same time,when the axial compression ratio is greater than 0.4,the seismic performance of the structure will change relatively little.Regardless of whether the steel beam is shear yield failure,bending yield failure or bending shear failure,the structure has higher ductility,while the shear failure specimens have better aseismic performance.The bearing capacity,stiffness and energy dissipation capacity of the specimen will decrease with the increase of the span to height ratio of steel beam.Among them,when the steel beam shear deformation,the span height ratio increases,the ductility will decrease;when the steel beam is bending deformation,the span height ratio increases,the ductility will increase.When the thickness of wall limb steel plate increases,the bearing capacity and stiffness of the structure will be improved,but the ductility of the structure will be reduced.When the thickness is greater than 10mm,the ductility of the structure will be significantly reduced.