Experimental Study And Structural Performance Analysis Of Composite I-steel Beam Column Joints

The light steel structure has light weight,high degree of assembly,and flexible space layout,which can effectively shorten the construction period,conform to the current green sustainable development strategy of my country,and have a broad application prospect.This paper studies a composite I-beam light steel structure system that uses self-tapping screws to connect.The beam members in the structure use light H-beams,the column members use new-type composite I-beams,and the node area is composite I-beam medium and large T-steel connections.Of beam-column nodes.This paper conducts experimental research and theoretical analysis on the beam-to-column connection,the combined I-steel column and the overall structure of the combined I-beam light steel structure system.First,the shear test of the self-tapping screw connector was carried out to analyze the force performance of the self-tapping screw in the connector.The test results show that under the condition of complying with the existing specifications,a single self-tapping screw and a single self-tapping screw in a group of screws The force state of the tapping screw is consistent with the ultimate bearing capacity;then the test specimens of the composite I-beam beam-column connection are tested.The test results show that the failure modes of the composite I-beam beam-column connection specimens are the most in the node area.Shear failure of outer self-tapping screws.The type of node and the thickness of the connecting plate in the node area have little effect on the ultimate bearing capacity of the node area,and the number of self-tapping screws has a greater impact on the bearing capacity of the node area;Finite element analysis was carried out on the steel connection node,and the non-linear fitting of the bending moment-angle curve of the combined I-beam connection node was established,and the node area bending moment-angle curve expression under different influencing factors was established;The steel column component has been experimentally studied,and the influence of the screw spacing on the equivalent bending stiffness of the composite I-beam is studied.The analysis model of the composite I-beam structure is established using SAP2000 finite element software,and the rotational stiffness of the node area and the composite I-beam are analyzed.The influence of different factors such as steel bending stiffness and composite column support on the overall mechanical performance of the composite I-beam structure.The analysis results show that the new composite I-beam residential system has good mechanical performance,and the inter-story displacement angle limit and mass participation coefficient meet the specifications Claim.