BUCKLING STRENGTH OF SLENDER RC COLUMNS SUBJECTED TO CENTRIC AXIAL LOAD IN FIRE

Study on fire resistance of slender RC columns　Part 1

Abstract

The fire resistance of high-strength (120N/mm²) slender RC columns is evaluated by conducting experiments and also by finite-element analysis. Experimental parameters are the ratio of column height to cross-section diameter and the axial loading of the specimens, while the results obtained are fire resistance time and failure mode. A proposed finite-element method of evaluating critical buckling strength based on tangent-modulus theory is then applied to the columns. In a parametric study using this method, the results indicate that the amount of transient strain and main reinforcement strength have little influence on buckling strength.