Experimental Study On The Seismic Behavior Of Concrete Filled Tube-confined Sandwich Shear Walls

With the rapid development of economy and the increasing attention paid to environmental protection,more and more research and application have been made on the construction of superimposed shear walls with quick and convenient construction and excellent performance.At present,commonly used shear walls at home and abroad are fabricated shear walls and laminated shear walls.Prefabricated shear walls still have many problems in the construction process:(1)A large number of spheroidal graphite cast iron sleeves are required for the connection of vertical reinforcements;(2)Many structural and temporary supports are required for the on-site constraining components of the shear walls and the in-situ casting of the columns.In order to solve the above problems,the steel pipe concrete is used as the edge constraint component of the prefabricated shear wall to form a new type of Concrete Filled Tube-confined Sandwich Shear Wall(referred to CFT-SSW).A pseudo-static test was conducted on a cast-in-place shear wall SW-1 and five CFT-SSW walls to examine its seismic performance.The experimental results show that the high-thickness ratio parameters have little effect on the CFT-SSW wall;at the same axial compression ratio,the bearing capacity and deformation ability of the CFT-SSW wall are significantly better than that of the SW-1.With the increase of the axial compression ratio,The cracking,yielding and peak load of CFT-SSW wall are all improved to varying degrees;the lateral stiffness of CFT-SSW wall will increase,but the limit displacement angle and ductility coefficient will decrease,and the total cumulative energy consumption will not change.In general,increasing the axial compression ratio,the plastic deformation capacity of the CFT-SSW wall will decrease,but it is not obvious.When the CFT-SSW wall axial compression ratio is 0.3,the ultimate displacement angle and energy dissipation capacity are still better than that of SW-1 with an axial pressure ratio of 0.15 in the same section,which shows a good seismic performance.Therefore,it can be used in practical engineering applications.Using a smaller cross-sectional area of the shear wall to increase the area of use of the building has a good promotion value.This paper uses XTRACT finite element analysis software to simulate the CFT-SS W wall and compares the simulation results with the experimental results.The error between the two is within 15%,XTRACT can better simulate the bearing capacity of the CFT-SSW wall.