Behavior of concrete filled steel tubular (CFST) triple-limb laced columns subjected to ISO 834 standard fire

Finite element analysis (FEA) model is established to study the behavior of concrete filled steel tubular (CFST) triple-limb laced columns subjected to ISO 834 standard fire. Some key mechanics characteristics on the fire performance of CFST triple-limb laced columns, including temperature distribution, failure mode, fire resistance, axial deformation and load distributions, are discussed based on the established FEA model. Finally, parametric analysis is performed to investigate the influence of various parameters, including slenderness ratio, load ratio, load eccentricity ratio, steel and concrete strength, on the fire resistance of CFST triple-limb laced columns, and the major influencing parameters are identified