The Study Of New Steel Plate Wall In Self-centering Structure

In order to improve the energy dissipation performance and recentering performance of the steel plate shear wall in the self-centering structure,a new type of steel plate shear walls-butterfly-shaped steel plate shear wall with edge stiffener rib was put forward,based on butterfly-shaped steel plate walls.In order to optimize the energy dissipation and recentering performance of the self-centering steel frame with infilled new type steel plate shear wall,and make a further study on it,by changing the thickness of the steel plate,the stiffener rib thickness,the area of the steel strand,the number of the steel strand,the span-depth ratio,the axial compression ratio and the number of infilled steel plate shear wall on the BASE specimen,using ANSYS to imitate these series of specimens,obtaining the hysteretic curves,skeleton curves,energy dissipation curves,bearing capacity degradation curves and stiffness degradation curves.Then,combined with the deformation of the specimen and the stress diagram,the strength,ductility and reset performance of the structure are analyzed.Analysis results are as follows:1)Structure can meet the design requirements.During the cyclic loading process,the steel frame remains in the elastic phase,and the earthquake reduction performance is good,it can be used continuously.After the steel plate shear wall yield,it comes into the plastic energy dissipation phase,and it can not be used repeatedly after earthquake.If replace the steel plate shear wall,the structure can recovery function.2)The stiffener rib is welded to the steel plate,which directly determines the energy consumption and recentering performance of the structure.When the thickness of the plate is unchanged,if the stiffener thickness slightly increased,the bearing capacity and energy dissipation performance slightly improved,which will play a good reinforcing effect to the stiffness and stability capacity.The effect of axial compression ratio will lead to P-? effect,and the bearing capacity will decrease with the increase of axial compression ratio.When the span-depth ratio is low,the tensile strength of the specimen will be formed in the loading process,and the energy dissipation can be improved.However,the smaller the span-depth ratio,the worse the recentering performance of the specimen.3)After a reasonable design,when the thickness of the steel is 6mm,the thickness of the stiffener rib is 3.5mm,the initial pre-tension is 175 kN,the high-thickness ratio is around 440 and the span-depth ratio is 1.7,the specimen will have better energy dissipation performance and recentering performance.4)When the number of infilled steel plate increases,the thickness of the steel plate should be reduced,but when the plate thickness is low,the energy dissipation performance of the structure is poor,which can not meet the design requirements of seismic performance.By design,when the number is two,it is appropriate to select the 4mm specimen,the ratio of height and thickness is about 660,when the number is three,it is appropriate to select the 3mm specimen,the ratio of height and thickness is about 880.In addition,in the case of the same amount of steel,the seismic performance of single butterfly-shaped steel plate shear wall is better than multiple plate.5)The new structure combines the advantages of self-centering structure and new steel plate shear wall.The steel plate shear wall has been used to enhance the application of thin steel plate shear wall.