Abstract
A refined numerical model was proposed to simulate the mechanical behavior of circular concrete-filled steel tubular (CFST) columns under fire conditions. The model was calibrated against the thermal and mechanical results from physical testing and showed good reliability. Based on the numerical analyses, the mechanical properties of steel-concrete interface and composite column for circular CFST with different confinement coefficients during the entire fire process were investigated in depth. Moreover, a series of parametric analyses were undertaken to investigate the influence of main factors, such as the load ratio, the steel tube ratio, the steel strength, the cross-sectional diameter and the concrete strength, on the mechanical behavior of the circular CFST column. Finally, a theoretical formulation and a simplified formulation for evaluating the ultimate bearing capacity of circular CFST columns with different length-diameter ratios under fire conditions were proposed, which showed an acceptable accuracy.
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