Experimental And Finite Element Research On Insertion Node Joints Of Composite Shear Wall With Steel Silo And Filled Concrete

Composite shear wall with steel silo and filled concrete is a new type of steel plate-concrete composite assembly shear wall structure.It consists of a U-shaped steel plate,1-shaped steel plate and a number of circular pipe supports.They weld to form a cavity and pour concrete into the cavity.It has the advantages of less welding quantity,fast construction speed,standardized manufacturing and less steel consumption.In the construction of composite shear wall with steel silo and filled concrete,the connection between upper and lower shear walls is very important.After consulting the references extensively,an insertion connection form of upper and lower walls is designed,based on the composite shear wall with steel silo and filled concrete.This joint form only needs to weld a certain number of inserts and steel slots at both ends of steel plate in the factory.In site construction,the insert plates of the upper wall is inserted into the steel slots of the lower wall,and concrete is poured into the cavity.The joint form has the advantages of convenient construction,simple appearance,no need to consider joint corrosion protection,and can greatly shorten the construction period.In order to study the mechanical behavior of this joint under reciprocating load,four insertion node joints of composite shear wall with steel silo and filled concrete specimens were designed and manufactured,and their quasi-static tests were carried out.The failure process,failure characteristics,hysteresis curves,skeleton curves,stiffness degradation curves,energy dissipation capacity curves,load-carrying capacity and ductility performance of joints with different axial compression ratios,insertion plate lengths and arrangement of inserts or not are obtained.The test results show that the failure mode of the insertion node joints of composite shear wall with steel silo and filled concrete is the buckling of the steel plate at the insert plate and the steel slots,the upper and lower shear walls dislocation at the joint joints,and the concrete crushes at the joint.The hysteretic curves of the four specimens are shuttle-shaped,with an average yield load of 687.7 k N and an average peak load of 785.3 k N.The ultimate viscous damping coefficient is between 0.17 and 0.22,and the ductility coefficient is between 2.19 and 1.76.Increasing axial compression ratio can significantly improve the energy dissipation capacity of specimens.The stiffness,yield bearing capacity and peak bearing capacity of insertion node joints can be greatly improved by inserting stiffener in the insertion node joints.The load-carrying capacity,ductility,stiffness and energy-dissipating capacity of the specimen are slightly improved after increasing the length of the insert plate,which has little effect on the mechanical properties of the specimen as a whole.The force law of the upper and lower walls in the joint area is that the two sides of the wall at the upper part of the joint area are compressed vertically and tensioned horizontally,the middle parts of the wall are tensioned vertically and horizontally,and the lower walls in the joint area are all compressed vertically and tensioned horizontally.On the basis of experimental research,the finite element model of four insertion node joints of composite shear wall with steel silo and filled concrete specimens is established by using ABAQUS finite element analysis software.The finite element model is analyzed,and the results of the finite element analysis are compared with the test results from the aspects of failure characteristics,hysteresis curve and skeleton curve.The results show that the finite element simulation and test results are in good agreement,which verifies the rationality and reliability of the finite element modeling method.Using the above modeling method,a composite shear wall with the same size as the insertion node joint is built,which proves that the joint structure is reliable and can provide a theoretical basis for the design.The layout and design principles of insertion node joints of composite shear wall with steel silo and filled concrete are also proposed.