Experimental research on mechanical properties of bolted joints with external necking steel sleeve
In order to solve the problems of complex regional structure of traditional concrete prefabricated beam-column joints,such as the projection of steel members affecting the spatial layout,a beam-column joint with external contraction steel sleeve connected by end plate bolts was proposed.Three fabricated joint specimens and one cast-in-place joint specimen were designed and manufactured.Through monotonic loading test of beam-column joints,the failure mode and mechanical properties of the joints were explored.The results show that the main failure mode of assembled joints is the bending failure of beam end,and the steel sleeve in the core area has not been obviously damaged.Narrowing the thickness gap between the sleeve and the stiffener can effectively ensure the overall mechanical properties of the specimen and improve the cooperative rotation ability of the joint.Compared with cast-in-place specimens,the peak bearing capacity of assembled specimens is increased by 22.7%,19.7%and 13.8%respectively,and the ductility coefficients are all between 3.47 and 3.73.The research results show that this kind of fabricated joint has the characteristics of simple installation,better bearing capacity than cast-in-place joint,and the beam can be disassembled and replaced in the later stage,which can provide some reference for the application of similar fabricated joint in engineering.
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