Study On The Hysteretic Behavior Of Steel Plate Shear Wall With Slits With Vertical Stiffening Band Of Channel Steel

The structure of steel plate shear wall with slits(SPWS)has the advantages of adjustable initial stiffness,high bearing capacity and good ductility,which has been widely used in recent years.The use of channel steel stiffening can effectively improve the out-of-plane stiffness of SPWS.It is possible to eliminate the out-of-plane curvature caused by the force in the middle of the SPWS,by setting a reasonable channel steel stiffening.In this paper,the finite element software ABAQUS is used to analyze the hysteretic behavior of the steel plate shear wall with slits with vertical stiffening band of channel steel.The doublei-fold line is chosen as constitutive relationship.This study can provide a reference for the further promotion of the structure.The main contents are as followed.(1)This paper is based on the existing Frame-SPWS specimen which is under low vertical reciprocating horizontal loading test and constant vertical load.The existing experiments were simulated by finite element software,and the hysteresis curves,skeleton curves and failure modes of the test specimens were output.By comparison,it is found that the numerical simulation results and the test results have little error,which lays a modeling foundation for the subsequent parametric analysis.(2)A systematic comparative analysis of the superiority of the hysteretic behavior of the vertically stiffened steel plate shear wall with slits with channel steel was carried out.Through the finite element software ABAQUS,the repeated stress process of the steel plate shear wall with stiffened steel plates was simulated,and eight models were established,respectively,for a total of two control groups.?Control group based on different methods of stiffening.·?Parametric analysis control group formed by changing the span ratio and height-thickness ratio of slotted steel wall with stiffened channel steel.Studies have shown that the specimen with stiffening is more stable than the specimen without stiffening,and the stiffening of the channel is more stable than the stiffening of the slat.Secondly,setting the stiffener can improve the bearing capacity and overall stiffness of the test piece.Thirdly,in the case of the same high aspect ratio,the larger the span ratio of the test piece,the more full the hysteresis curve,the greater the bearing capacity of the test piece,and the larger the initial stiffness of the test piece with a larger span ratio.Finally,in the case of the same span ratio,the higher the aspect ratio of the test piece,the more obvious the"pinch"of the hysteresis loop,the weaker the bearing pressure,and the smaller the initial stiffness of the test piece.(3)The influence of the section size change of the channel steel on the hysteretic behavior of the shear wall of the seam steel plate was studied and compared.The span-to-height ratio and the high-thickness ratio of the steel wall with seams are controlled.Seven models are established with the rib height,rib width and rib thickness of the channel steel as the variation parameters.The research shows that,firstly,the increase of the rib height of the channel steel stiffening has little effect on the hysteresis performance.Secondly,increasing the rib width of the channel stiffener can effectively improve the energy dissipation capacity of the steel plate wall,effectively improve the overall stability and load carrying capacity,and has the best restraining effect on the out-of-plane buckling of the steel plate wall.Lastly,increasing the thickness of the channel steel can improve the plasticity of the test piece,and has a good effect on the constraint of the out-of-plane buckling of the steel plate wall.