Abstract
The axial compressive behavior of composite columns with recycled aggregate concrete (RAC)-filled steel tube and profile steel was examined through numerical investigations. The constitutive models of the RAC material, profile steel, and steel tube were assigned to respective elements in the columns. The experimental results were used to verify the finite element (FE) model. Results indicated that the FE model accurately predicts the deformation, stress, and load–strain curves of the columns. Then, the effects of RAC strength, steel tube strength, profile steel strength, profile steel ratio, and diameter-to-thickness ratio on the axial compressive behavior of the columns were evaluated through a parametric study. The increase in RAC strength, steel tube strength, and profile steel strength significantly affected the axial bearing capacities of the columns. However, deformation ability and ductility decreased gradually as the RAC strength and steel strength increased. The increase in the diameter-to-thickness ratio had a negative effect on the axial bearing capacities of the long columns. Based on the experimental research, FE analysis, and ultimate analysis method, a formula for the axial bearing capacity of the composite columns was proposed. The validity of the proposed formula was verified through the comparison of the results. The research conclusions can provide a reference for the design of composite columns.
Published Version
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