Interpolation approach to predict P-I diagrams for RC columns

This study aimed to develop a methodology to predict the bending and shear P-I diagrams for any arbitrary RC columns based on a simple linear interpolation approach, which eliminates the need to conduct multiple blast analyses through rigorous nonlinear time-history approaches. The bending and shear P-I diagrams for the 15 RC column section are incorporated into the database, which covers the typical range of office buildings. The effectiveness of the proposed interpolation approach has been validated through comparisons between the interpolated P-I diagrams and those directly derived from trial-and-error-based blast analysis. The proposed methodology can be effectively used to assess whether to remove or retain the RC member that experienced the explosive loading, when the bending and shear P-I diagrams are not available, and to determine the required section dimensions and reinforcement ratios of RC columns during the explosion-proof design process.