| The hollow concrete-filled steel tube composite column is derived from the concrete-filled steel tube composite column and is a structural member with broad application prospects.The structure is formed by wrapping concrete around the inner steel tube.This kind of structure has the advantages of general inner concrete filled steel tube structure,and at the same time it has the advantages of light weight,high bending resistance,good seismic and fire resistance,etc.In recent years,the research on the mechanical properties of its members has been gradually improved,but the research on its beam-column joints is still relatively blank.As we all know,beam-column joints have always been a difficult point in the design and construction of frame structures and an important guarantee for building reliability.Therefore,the hollow concrete filled steel tubular composite column-H-shaped steel beam joints are even more important.Sleeve-type square hollow steel tube concrete composite column-H-beam outer ring plate joint is a rigid joint connecting the hollow steel tube concrete composite column and H-beam by sleeve and outer ring plate.Rigid joints have many advantages,among which the most prominent is clear force transmission path,simple construction and safe and reliable performance.In this paper,the finite element analysis method is used to simulate the hysteretic behavior of concrete filled square hollow steel tubular column-H-beam joints subjected to axial force at the top of the colunn and vertical cyclic load at the end of the beam.The influence of axial force ratio and beam height on the hysteretic behavior is analyzed.The main contents and achievements of this paper are as follows:(1)Establish the outer ring plate joint of the sleeve-type square hollow concrete filled steel tubular column-H-shaped steel beam(the joint studied in this paper is the column joint of the frame structure)under cyclic reciprocating load,use ABAQUS finite element software to model the beam-column joint,and make reasonable selection and setting of element type,mesh division,boundary condition and interaction.(2)Referring to the test results similar to the classical joint test in the past,using ABAQUS finite element analysis software,considering geometric nonlinearity and material nonlinearity,the finite element analysis models of steel,concrete and steel are established by shell element,solid element and wire element,respectively,and the P-hysteretic curve is drawn and compared with the load-displacement hysteretic curve obtained from the test results,thus verifying the correctness of the finite element modeling method.(3)By studying the hysteretlic behavior of concrete filled square hollow steel tube composite column-H-beam joints,and comparing the hysteretic curves,skeleton curves,ductility,stiffness degradation curves and energy dissipation capacity of members with different parameters,the influence of column axial compression ratio,sleeve thickness and web height parameters of H-beam on the seismic behavior of the joints is analyzed.The axial compression ratio has little effect on the seismic behavior of the joints.The thickness of the sleeve has little influence on the seismic performance of the joint,and the ultimate load slightly increases with the decrease of the thickness of the sleeve.The web height of the H-beam has a great influence on the seismic performance of the joint.When the web height of the H-beam increases,the seismic performance of the joint will decrease significantly. |
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