Experimental Study On Axial Compression Behavior Of Double Steel Plates Composite Shear Wall With L-shaped Connectors

Double steel plates-concrete composite shear wall is a new type of steel-concrete composite structure,which is formed by connecting steel plates and concrete plates through connectors.It has the advantages of high bearing capacity,good ductility and light weight.Referring to relevant literatures at home and abroad,the existing double steel plates-concrete composite shear walls have many forms but most of them have complex structures,which bring more inconvenience in construction and architectural structure design.Double steel plates composite shear wall with L-shaped connectors is a new type of steel plate concrete composite wall structure with simple structure,convenient construction and in line with the concept of assembly type.This paper studies and analyzes the axial pressure properties of the structure,and the contents are as follows:Five composite wall specimens were designed and manufactured,and the monotonic axial pressure test was carried out.The factors that changed in the test were the vertical welding seam distance between L-shaped tie and steel plate,the thickness of steel plate,the thickness of composite wall,etc.,the load-displacement curve of each specimen and the strain data of wall steel plate and tie pieces were obtained through the test,and the failure phenomenon,axial bearing capacity and strain data of composite wall specimens were analyzed.The test results show that the axial compression bearing capacity of the five specimens is relatively high.The axial compression bearing capacity of the specimens increases with the decrease of the vertical weld spacing of L-shaped connectors.The increase of steel plate thickness and composite wall thickness is beneficial to the improvement of the axial compression bearing capacity of the structure.L-shaped connectors can ensure the cooperative work of steel plate and concrete.The ductility of the specimen is poor and the vertical displacement is small.According to the relevant regulations and combined with the test situation,three calculation methods of the axial bearing capacity of the double steel plates composite shear wall with L-shaped tie member are summarized,and the calculation formula of the axial bearing capacity proposed in this paper is derived according to the buckling analysis of the steel plate and the constraint action of the internal filled concrete.The finite element model of ABAQUS was established for five test specimens,and the simulation results were compared with the test results to verify the test.Then,on the basis of the original model,the parameters of some models were changed,and the finite element multifactor analysis was carried out to supplement the experimental research content.