Research on Shear Performance of A New Type of Joints Between Composite Floors and Steel Beams
To study the reliable connection between the steel beam and the composite floor in the prefabri-cated staggered truss structure system,the paper proposed a joint connection form in which the hollow com-posite floor and the steel beam formed a composite flat beam.Push-out tests were carried out on 4 groups of 8 steel-concrete composite specimens connected by high-strength bolts,T-shaped connectors,and through-bars,the effects of the diameter of rebars and the presence or absence of T-shaped connectors on the failure mode,load-slip characteristics,and shear capacity of the joints were mainly analyzed.ABAQUS finite ele-ment software was used to establish an accurate nonlinear finite element model for the specimens to analyze the transmission mechanism of internal shear force,and the numerical analysis results were compared with the experimental results.The research results showed that the new failure mode of the new type of joints was that the high-strength bolts were sheared at the interface between the T-shaped connector and the steel beam,and brittle failure occurred;the bearing capacity of the component could be significantly improved;the diameter of the through-bar could be increased to improve the shear bearing capacity and shear stiffness of the member.It is recommended to use a through-bar with a diameter of 20 mm.
push-out testT-shaped connectorthrough-barhigh-strength boltfinite element
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