Research On Seismic Behavior Of H-shaped Steel Beam To SCFT Column Joint With Beam Web Openings

Traditional beam-column joints tend to form plastic hinges at the end of the beam weld,causing brittle fracture at the relatively fragile weld joints.It make the plastic hinge away from the joint welds and move to the weaken section,which can effectively protect the joints and avoid joints weld brittle fracture.In this paper,the ABAQUS finite element software was used to open the hole in the beam web of the steel tube concrete column-H steel beam joint on the basis of existing experiments and theories.The anti-seismic performance was studied,and the parameters of the weakening of the node were proposed.Reasonable value range.The main research work of this article contains aspects listed below:First of all,based on existing experiments,this paper establishes the joint model of concrete-filled square steel tubular column(CFST)-H steel beam by adopting reasonable modeling method.The correctness of ABAQUS modeling is verified by comparing and analyzing the analysis results of ABAQUS software and existing experiments.A model of concrete-filled square steel tubular column(CFST)-H steel beam joints with web openings is established and the seismic behavior of the joints is compared with that of ordinary joints.the results are as follows: the seismic performance of the weakened joint with open hole in beam web is better than that of common joint without opening.Second,depending on the different weakening parameters L and R,L denotes the distance between the hole and the column,R denotes the radius of a hole,two groups of 11 concrete filled square steel tubular columns with open webs are built up to model the joints of steel beams,its mechanical properties under low cyclic loading were studied.The results are as follows: selecting two reasonable weakening parameters can obviously improve the seismic performance of the joints and reduce the influence of the opening of the beam web on the joint strength.It lays a foundation for further research and it provides conditions for structural design.Finally,the reasonable range of L and R weakening parameters is given.It lays a foundation for the further study of the steel beam joints of the steel column with concrete filled square steel tube with openings in the beam web,and provides an important theoretical basis for the design and application of these joints.