Axial Compression Behavior Of Double-Steel-Plate Composite Shear Wall With Restraining Tie Rod Connections

The double-steel-plate composite shear wall(DSCW)is composed of steel plates on both sides,in-filled concrete,and mechanical connectors between steel plates.It has many advantages such as light weight,high axial pressure,high ductility,thin wall,good seismic performance,and higher assembly rate.With the continuous improvement of building height and functional requirements,it has been widely used and developed.At present,the research on the double-steel-plate composite shear wall mainly focuses on its seismic performance.There is little research on its axial compression performance,force characteristics of restraining tie rod connector,and no research on the force characteristics of restraining tie rod under different parameters.In order to solve the above problems,this paper designs a double-steelplate composite shear wall with restraining tie rod connection and carries out experimental research,finite element analysis,and artificial intelligence prediction.The specific research contents are as follows:(1)Four double-steel-plate composite shear walls connected by restraining tie rod were designed and fabricated with steel plate thickness,concrete strength,and restraining tie rod spacing and quantity as parameters.The axial compression tests were carried out and the effects of steel plate thickness,concrete strength,restraining tie rod spacing and quantity on the failure mode,stiffness,and axial bearing capacity of the double-steel-plate composite shear wall were compared and studied.(2)The test results show that the overall stiffness of four double-steel-plate composite shear wall specimens is almost the same at the beginning of loading.The ultimate bearing capacity of specimens increases significantly with the increase of steel plate thickness,concrete strength,and the decrease of restraining tie rod spacing.DSCW-1 has better ductility compared with other specimens due to the better combination of parameters,which makes the steel plate and concrete have better cooperative working performance under the restraint of restraining tie rods.(3)Based on the test results,the finite element model of the double-steel-plate composite shear wall is established by ABAQUS.The C3D8 R solid model is used to simulate the steel plate,concrete,and restraining tie rod in the model.By comparing the load-displacement curves obtained from the test and the finite element simulation,it is found that the established finite element model can simulate the axial compression behavior of the double-steel-plate composite shear wall well,and the ABAQUS simulation results have high reliability and accuracy.(4)Through the finite element software ABAQUS,the influence of different design parameters including spacing and quantity of restraining tie rod,diameter of restraining tie rod,arrangement of restraining tie rod,strength grade of restraining tie rod,thickness of steel plate,strength grade of steel plate,and strength grade of concrete on the bearing capacity of specimens are analyzed,and the restraining tie rod related parameters are mainly discussed.The results show that spacing and quantity of restraining tie rod,diameter of restraining tie rod,thickness of steel plate,strength grade of steel plate,and strength grade of concrete have obvious influence on the bearing capacity of specimens,and all behave as a linear relationship.The restraining tie rod arrangement has no obvious influence on the bearing capacity of the specimens,but it can improve the buckling shape of the steel plate when the specimens are destroyed.The strength grade of the restraining tie rod has little influence on bearing capacity and can be neglected.Based on the analysis of simulation results,the main influencing factors of the axial bearing capacity of double-steel-plate composite shear wall are obtained,and the calculation formula for the axial bearing capacity of double-steel-plate composite shear wall with restraining tie rod connection is fitted.The accuracy of the simplified formula is verified by comparing the simulated value with the calculated value.(5)Aiming at the present research on axial compression performance of doublesteel-plate composite shear walls mainly focuses on test and finite element simulation,this paper presents a predictive model for the axial compression bearing capacity of double-steel-plate composite shear wall based on particle swarm optimization least squares support vector machine(PSO-LSSVM).Twenty-seven groups of experimental data from specialists and scholars at home and abroad were collected,of which twelve groups and eighteen groups of finite element simulation data from Chapter 4 were selected as the test set.After the training,the axial compressive bearing capacity of the remaining fifteen DSCWs were predicted and compared with the test results.The research shows that the forecast results of this model are accurate,scientific,reliable,and have certain guiding significance for engineering practice.