Fire performance of eccentrically-loaded square and rectangular tubed-reinforced-concrete columns

Tubed-reinforced-concrete (TRC) columns are gaining increasing popularity in engineering constructions, however, research on their fire performance is still limited and mainly focused concentrically-loaded columns. In this study, extensive numerical analysis was carried out to investigate the of square rectangular TRC under eccentric loading exposed ISO 834 standard fire. A sequentially-coupled thermo-mechanical finite element (FEA) model developed ABAQUS validated well against testing results. The high-temperature overall deformations, internal bending moments cross-sectional load redistributions with different eccentricities were analysed. Parametric studies conducted influences eccentricity ratio, sectional aspect direction, protection thickness, dimension, ratio slenderness resistance Load found have a greater effect resistances lower than those higher slenderness. Rectangular ratios no larger 2 could generally achieve identical buckling as that equivalent sections. direction column insignificant. design method then proposed for both ambient-temperature designs eccentrically-loaded cover protected unprotected has been thoroughly detailed FEA modelling yields excellent agreements