| Due to its advantages of high bearing capacity,good plasticity,good fire resistance,superior seismic performance and short construction period,the fabricated CFST beam structure is widely used.In our country,The theoretical study on the prefabricated CFST-steel beam joints started later and studied less,This paper has important theoretical significance and engineering value for improving the practical application of prefabricated steel tube concrete frame by studying the mechanical behavior of prefabricated steel tube concrete column-steel beam joints.The existing researches on concrete filled steel tubes are mostly concentrated on square-CFST columns,while there is less research on circle-CFST.In this paper,the finite element software ABAQUS is used to simulate the joint of the assembled steel pipe concrete column and the steel beam.According to the calculation results,the mechanical properties of the concrete filled steel tubular column under the different axial compression ratio are analyzed,and the stress and deformation of the joints of the square section and the circular section are compared under the same axial compression ratio.The low-cycle repeated load was applied to the joints to obtain the hysteretic curves and skeleton curves of the concrete-filled square steel tubular steel beam joints and round-steel-filled concrete-filled steel tubular joints,make further efforts to comparative analysis two kinds of node of strength degradation,stiffness degradation,ductility and energy dissipation capacity,investigate the seismic performance of the nodes.Based on the comparison of square CFST steel beam joints and circular CFST joints,the factors that affect the bearing capacity of joints are further analyzed.By changing the thickness of the steel pipe wall,the type of load on the node,and the material quality of the node beam to analyze the bearing capacity of the node,try to find a more reasonable node design scheme to provide reference for practical engineering applications. |
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