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Experimental and Numerical Study on double-layer concrete-filled steel tubular columns for steel beam joints

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Document pages: 13 pages

Abstract: This paper introduces a new type of connection between concrete-filled steel tubular column and steel beam. Four semi proportional joint specimens of different specifications were constructed and tested under constant axial compressive force. Vertical low reverse load was applied at the beam end to check its failure mode and hysteretic performance. The beam hinge mechanism of the joint was observed in the arc region of the horizontal end plate. The proposed connector shows good energy dissipation capacity, and its limit rotation in the failure state reaches 0.05   rad, so as to meet the ductility requirements of fema-350 ≥ 0.03   rad for earthquake resistance. The finite element analysis (FEA) model of the joint is established and Vlidated by comparing its predictions with experimental results. The FEA model was used to investigate the effects of different parameters such as the stiffened height of the web anchorage plate, axial load level, steel and concrete strengths, steel ratio on the moment-rotation relationship, and initial stiffness of the connection. This paper presents some important design considerations of the connection, as well as aspects requiring further study.

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