Computation of Stress Block Parameters of Rectangular RC Column at Elevated Temperatures

This paper proposes an approach to determine the load carrying capacity of Reinforced Concrete (RC) columns at elevated temperatures using Stress block parameters. The method uses a Strain distribution diagram for the RC column with various cases of eccentricity and utilizes maximum strain and minimum strain mentioned as per Eurocode. A modified strain distribution diagram is plotted using temperature-dependent strain properties, and a modified distribution diagram calculates stress at that level. Stress block parameters (C1, C2) are computed using these values, which can be used to determine Pu and Mu for various cases of eccentricities. Further, these values can be used to plot interaction curves for multiple temperatures following the standard time–temperature curve.