Seismic Performance Analysis Of Through Joints Of Concrete-filled Square Steel Tube Columns And H-shaped Steel Beams Bolted And Welded

It is easy to be brittle when the traditional inner bajffle joint is connected to the flange and the column welding.The performance of the outer ring plate joints is not stable,and the local area is easily damaged.It is more and more popular to have high bearing capacity and ductility.In this paper,a nonlinear finite element software ABAQUS is used to study the hysteresis performance of the welded joint baffle joints of square steel tubular column-H beam.Using finite element software to establish corresponding YS node model and experimental model,based on the existing experimental results and YS the node,comparing the finite element results proved that the ABAQUS finite element analysis software for simulating the concrete filled steel tubular column and H type steel beam the applicability of bolt welding clapboard through type node.In order to further analysis of bolt welding clapboard through type node structure on its seismic performance,by consulting relevant literature and specification,select the other two different forms of bolt welding clapboard and YHB node through type node.The difference between YHA node,YHB node and YS node hysteresis performance is analyzed,and the results show that YHA node has better seismic performance.Selecting seismic performance better YHA node parameter expansion analysis,focus on analysis of the axial compression ratio,the thickness of the diaphragm,extension length of diaplhragm,bolt and bolt pre-tightening force number and arrangement of the parameters,such as five series model is established;By comparing the node failure modes,hysteresis curves,skeleton curves,displacement ductility coefficient and stiffness degradation curve and energy dissipation capacity,six indexes on seismic performance of nodes make reasonable evaluation.The finite element analysis results show that when the axial compression ratio is less than 0.6,the axial compression ratio has the least influence on the seismic performance of joints.Point up the plate thickness on the seismic behavior of increase to a certain extent,but the thickness of the plate after more than 14 mm layer on seismic performance of ascension is very small;Clapboard length of overhanging node in the production of plastic hinge and earthquake has a certain impact,clapboard elongation through outside while reduce the seismic performance of node,when the design will be the overhanging length is set to 50 mm一75 mm reasonable;Bolt arrangement of node had a greater influence on the seismic performance,when the bolt using staggered arrangement,seismic performance of nodes will have fallen sharply,the bolt 6 the side-by-side arrangement of seismic performance of the best.Owe twist will result in a slight decrease in the seismic performance of the joint,and the effect of super-twist on the seismic performance of the node is not significant.The bolt leakage will cause a sharp decrease in the seismic performance of the node,and it should be avoided.