Study On Hysteretic Behavior Of Cross-plate And End-plate Connection Joints Between Box Modules Of Steel Structure

In the past few years,with the rapid growth of the national economy,the development of China's construction industry has made good achievements.The construction industry is undergoing industrial upgrading,and industrialized construction has emerged as the times require.As one of the most integrated prefabricated building forms,modular building has become a hot spot in the industrial construction era due to its advantages including quality,efficiency and environmental protection.However,the research on the splicing joints between the box-type modular steel structure cabinets is not mature enough,which has become a bottleneck restricting its development in the low multi-storey building field.In view of the existing problems of box-to-box splicing joints in box modular steel structures,two types of box-to-box structures with different lateral resistance modes are designed in this paper,and the corresponding joint forms of cross-plate and end-plate bolt connection are proposed.For this node,the pseudo-static test of two-story single-span box-type modular steel structure building is carried out to study its seismic performance under cyclic loading.The test results show that the joint deformation between the frame-type joints(the type ? of joints)due to the cracking of the welds and the energy dissipation capacity are not fully exerted,and the test ends due to the cracking of the welds at the joints of the beams and columns.The connection between the wall-type box joints(the type ? of joints)is greatly improved compared with the specimens of the first type of joints.At the end of the test,the joints of the joints are obviously deformed,and the strength and stiffness are degraded smoothly,showing good ductility and energy consumption.Based on the nonlinear finite element software ABAQUS 6.14,considering the geometric nonlinearity,material nonlinearity and contact nonlinearity,two kinds of wall finite element models are established according to the experimental conditions.The finite element results and experiments are carried out.The results were compared and the two were in good agreement.Then the parameters were analyzed,and the effects of axial compression ratio,node cross-shaped plate thickness,end plate thickness and column end plate thickness on the node performance were discussed.The analysis shows that as the axial compression ratio increases,the "P-?" effect of the test piece is more significant,and the influence on the bearing capacity of the joint is greater.As the thickness of the riser of the cross-plate increases,the stiffness and bearing capacity of the joint are greater.The thickness of the end plate of the connecting device and the thickness of the end plate of the module column have little effect on the bearing capacity and rigidity.