Study On Mechanical Behavior Of Double Side-Plate Joints Of Wall-Mounted Concrete Filled Steel Tube To H Steel Beam

The concrete-filled steel tube column and steel-beam joints combine the advantages of steel with concrete.At the same time respond to the national call for supporting the development of prefabricated structures such as steel structures and improving the quality of construction.They are commonly used in both multi-storey and high-rise buildings.Based on the wall-type CFST column high-rise steel structure residential system,a new type of wall-type CFST column and double-sided plate connection joints are proposed in this paper.The wall-type concrete-filled steel tube column has the advantages of high bearing capacity,high rigidity,good ductility and good energy consumption performance.At the same time,it has good economy and high comprehensive efficiency.For its special section size,traditional joints like internal partition joint,threaded bolt joint and outer ring plate joint are no longer appropriate,unacceptable and cannot meet the needs of actual engineering.In summary,this paper proposes a wall-type concrete-filled steel tube column-H-shaped steel beam double-sided plate joint with reference to the improvement methods of domestic and foreign nodes in recent years.For this kind of node form,the specific work done in this paper is as follows:(1)The pseudo-static test of the double-sided plate joints of the wall-type CFST-Hbeams was carried out,and the hysteretic behavior,stiffness degradation,ductility,energy dissipation and failure modes of the joints were studied.The results show that the doublesided plate joints are damaged by the plastic joints at the beam ends,and the nodes have good hysteresis performance,ductility and energy consumption.(2)The simulation of the joint under low-cycle reciprocating load is carried out by finite element software ABAQUS.The simulation results are in good agreement with the test process.At the same time,the failure mode,force performance and seismic performance of the joint are analyzed.The finite element calculation results are basically consistent with the experimental results,which verifies the correctness and authenticity of the finite element analysis.(3)Through the finite element nonlinear monotonic loading simulation,the effects of different axial compression ratios,side plate extension length,side plate thickness,and node zone flange thickness on the mechanical properties of the joints are considered.The analysis shows that the control axial compression ratio can effectively control the ductility of the joint specimen;controlling the elongation of the side panel can improve the ductility of the specimen,and has less influence on the bearing capacity.Adjusting the length of the side panel can control the position of the plastic hinge;The thickness can affect the failure mode of the joint,and it also has a corresponding influence on the bearing capacity and ductility of the joint;the thickness of the flange of the joint zone has little effect on the mechanical performance of the joint;meanwhile,the force transmission mechanism of the joint is also summarized.(4)Summarizing the test and finite element calculation results,the node construction suggestions and node production construction suggestions are proposed,which can effectively shorten the engineering cycle.