| Hollow concrete filled steel tubular(CFST)structure is a new type of structure with good development prospects.It is a composite structure composed of inner steel tube wrapped with reinforced concrete.This kind of composite structure has the advantages of common concrete filled steel tube structure,and it has the advantages of light weight,high flexural performance,good seismic and fire resistance.Therefore,hollow concrete filled steel tubular structures will be widely used in future construction projects.As we all know,beam-column joints have always been the difficulty of frame structure design and construction,and also an important guarantee of building reliability.Therefore,the hollow concrete-filled steel tubular composite H-section steel beam outer ring plate joints are more important.Many scholars have also done a lot of research on the connection mode of hollow concrete filled steel tubular composite column-H-shaped steel beam outer ring plate joints.Sleeve-type hollow concrete filled steel tube composite column-H-shaped steel beam outer ring plate joint,using sleeve and outer ring plate to connect hollow concrete filled steel tube composite column and H-shaped steel beam rigid joint.Rigid joints have many advantages,among which the most prominent one is the clear path of force transmission,simple construction and safe and reliable performance.In this paper,the mechanical properties of sleeve hollow concrete filled steel tubular composite column-H-shaped steel beam outer ring plate joints under static load are studied by numerical simulation.The main contents and achievements of this paper are as follows:(1)Establish the finite element analysis of circular hollow concrete filled steel tubular composite column-H-shaped steel beam joint(the joint studied in this paper is the column joint in frame structure)under static load,use ABAQUS finite element software to build the finite element model of beam-column joint,and make reasonable selection and setting of the element type,mesh division,boundary conditions and interaction of the model.(2)Select sim ilar topics for finite element simulation and compare the simulation results with the experimental results to verify the reliability and correctness of the finite element method;(3)The uniform monotonic loads are applied at both ends of H-beam,and the whole process of the joint specimen is analyzed.The load-displacement curve at the end of the beam and the bending moment-rotation curve of the beam are extracted,and the whole process of the curve is analyzed.(4)By changing the axial compression ratio,sleeve thickness,H-beam height,H-beam thickness,H-beam flange width,steel type,stiffening rib settings,the mechanical properties and failure modes of the joints were compared and analyzed.It was found that the change of H-beam height had the greatest impact on the joints. |
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