Fire Performance and Design Method of Steel Reinforced Concrete(SRC) Columns

The thermal properties and the stress-strain relations of steel and concrete in steel reinforced concrete (SRC) columns under high temperature are determined.Finite element method is applied to calculate the temperature fields of the sections.A comparison between calculated results and tested results of temperatures shows good agreement.A numerical method is developed to calculate the fire resistance and the load-deformation curves of steel reinforced concrete columns.The calculated results agree well with those of tests.Based on the theoretical model,influences of the parameters,such as sectional dimensions,slenderness ratio,steel ratio,reinforcement ratio,load eccentricity ratio,strength of steel section and reinforcement,strength of concrete and length-to-width ratio of the section on fire resistance and bearing capacity under fire are analyzed.A simplified model is developed for calculating the fire resistance of steel reinforced concrete columns.This is the second part of the article.