PARAMETRIC STUDY AND DESIGN METHOD ON FIRE RESISTANCE OF CONCRETE ENCASED STEEL (CES) COLUMNS UNDER 3-SIDE HEATING

摘要

ABAQUS finite element model was developed to trace the fire resistance of CES columns subjected 3-side heating. Data from fire resistance tests is utilized to validate the finite element model. The validated FE model was then applied to conduct parametric studies to investigate the influence of load ratio, eccentricity, steel ratio, reinforcement ratio, and sectional dimensions on the fire resistance of CES columns under 3-side heating. Simplified calculation method was proposed based on parametric study. Results indicate that load ratio, eccentricity ratio and steel section ratio have noticeable influence on the fire resistance of CES columns under 3-side heating, and reinforcement ratio has moderate influence. Higher steel section ratio leads to a higher fire resistance, but the higher load, eccentricity and reinforcement ratio induce a lower fire resistance. The proposed simplified calculation method can be a reference for fire design of CES columns.