Energy Dissipation And Failure Mechanism Of Steel Plate Shear Walls And The Thickness Effects Of The Infill Steel Plate

Reasonable seismic design on the structure can resist earthquake through multiple lines.So,it is important to take advantage of the structure effectively.Steel plate shear walls(SPSWs)have been widely utilized as an effective lateral load-resisting system for high-rise buildings in high-risk seismic regions,due to the proper lateral stiffness,ductile behavior and large energy dissipation capacity.The important practice is to use thin infill plate of SPSWs,relying on post-bucking strength of the infill plates to calculate the energy dissipation capacity of SPSWs.The surrounding framing members are generally“capacity designed”,designed to develop the infill plate tension field capacity,while themselves remaining essentially elastic.The thin steel plate or perforated plate has been proposed to be used in steel plate shear walls(SPSWs)to reduce the stiffness demands and then the size of columns,which always yield owing to the action of the diagonal tension formed in the infill plate.However,using the thin plate on the other hand will lead to a large inter-story drift and thus decrease the seismic performance of a structure and it failure mechanisms.So,it is a key to understand the effect of the thickness of the infill plate on the seismic performance of a SPSW structure.It is important to have a knowledge about the failure process of steel plate shear walls.This paper simulates the failure process of the SPSW structure with variable thickness of steel plates.It is shown that the failure of a SPSW structure generally undergoes four typical state: complete yielding of the infill steel plate,random buckling and of the infill plate,forming the diagonal tension fields,yielding of the column.The pinching phenomenon happen in the envelope curves of steel plate shear walls in the special state of random buckling of the infill plate.which owing to the random yielding of the infill plate.It also shown that The heterogeneous tension and compressive stresses transformed by the infilled plate to columns is a significant cause that lead to yielding of column.This paper presents the analysis of different SPSWs with variable thickness infill plates based on the knowledge about energy dissipation mechanism and failure process ofSPSWs.The results reveal that a thin infill plate in the SPSW buckles easily,but the columns also yield under a smaller drift displacement than the case with a thick infill plate.After the infill plates yield,the thicker plate exhibit a more stable hysteresis loops and a higher energy dissipation capacity.When the thickness of the infill plate is larger than some value(e.g.SPSW4),the column yield under a smaller drift displacement,which the steel plate is not yielding and buckling.So,it is important to get an optimized design between the thickness of the infill steel plate and the stiffness of columns so that take advantages of the SPSW as one of the lateral resistant systems in building structures.