Abstract
This paper presents a detailed investigation of the performance of cold-formed round-ended concrete-filled steel tubular (RECFT) columns under cyclic loading via experimental and numerical approaches. Experimental tests and observations of this type of novel composite column are presented, and its failure modes, hysteretic curves, ductility ratio, energy dissipation, stiffness, and strength degradation are revealed. A nonlinear finite element (FE) model of the RECFT column under cyclic loading is established and verified by the test results. Additional parametric analyses on the effect of material strength, axial compression ratio, diameter/thickness ratio, aspect ratio, and loading direction are subsequently performed using the validated FE methodology. Simplified prediction methods are proposed to assess the initial flexural stiffness, ultimate strength, ultimate displacement, and descending stiffness of the RECFT column under cyclic lateral force. The test and numerical investigation results indicate that the failure modes of the cold-formed RECFT column under cyclic loading mainly include concrete crushing, local buckling, and fracture of the steel tube. This type of composite column with a round-ended section exhibits good hysteretic behaviour, high ductility, and sufficient energy-dissipation capacity.
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