Finite Element Analysis Of Composite Wall-steel Beam Joint Performance Based On Assembled Cross U-shaped Connector

In recent years,with the gradual promotion of "green buildings" and the continuous maturity of building industrialization technology,prefabricated buildings have gradually become the development trend of modern buildings.Bolted connections have also become the main connection method for beam-column joint and beam-wall joint in engineering structures.Based on this,this paper proposes assembled cross U-shaped connector as the main force-bearing connectors of the composite wall-steel beam joint.Through multi-bolt connection and fewer welded connections,the stress concentration and weld quality problems caused by a large number of welded connections in the past are reduced.The quality and project progress are effectively guaranteed.The standardization and modular production of prefabricated joint can be realized,and the development of industrialization can be promoted.According to the force characteristics of actual engineering joint.This paper designs a steel plate concrete shear wall-steel beam joint based on assembled cross U-shaped connector,and gives the corresponding dimensions of the joint to study its static performance and seismic performance.Using this as the basic model,establishes an ABAQUS finite element model and analyzes the influence of the parameter changes of U-shaped plate thickness,U-shaped plate length,bolt diameter and steel coupling beam span-to-height ratios on the joint failure characteristics,ultimate bearing capacity and initial stiffness under monotonic loading,as well as the changes of various parameters under low-cycle reciprocating loads.The research results show that the composite steel plate concrete shear wall-steel beam joint based on assembled cross U-shaped connector has better plastic deformation ability.U-shaped plate thickness and the steel coupling beam span-to-height ratios have a greater influence on the static performance of the joint.Increasing the U-shaped plate thickness can increase the initial stiffness of the joint.As the steel coupling beam span-to-height ratios decreases,the initial stiffness of the jointincreases significantly.Appropriately increasing the bolt diameter can increase the ultimate bearing capacity of the joint.Changing the U-shaped plate length has little effect on the static performance of the joint.The hysteretic curve of each joint model is relatively full.The hysteretic performance is better.The equivalent viscous damping coefficient value is between 0.291 and 0.431.The corner ductility coefficient is all in 4 and above,the energy consumption is obvious.When the U-shaped plate thickness is about 12 mm,the energy consumption and ductility of the node model are excellent.When the U-shaped plate length is increased from 200 mm to 240 mm,the ductility coefficient increases by 12.2%.When the bolt diameter increases from 16 mm to 27 mm,the ductility coefficient of the joint gradually increases,and the value increases by 19.1%.As the steel coupling beam span-to-height ratios increases,the deformation capacity of the joint model gradually increases.And the ductility increases from 4.48 to 6.05,the value increases.The joint’s energy consumption capacity is significantly enhanced.Through the finite element simulation analysis,in order to ensure the reliable force transmission of the joint,it is recommended that the U-shaped plate thickness is 12mm～16mm.When the steel coupling beam span-to-height ratios is 8.20,the U-shaped plate length is 220mm～240mm,the bolt diameter is 18mm～22mm.