In this study, numerical simulations are performed to construct the Pressure-Impulse (P-I) diagrams for
FRP strengthened RC columns to provide correlations between the damage levels of FRP strengthened RC
columns and blast loadings. Numerical model of RC columns without or with FRP strengthening is
developed using LS-DYNA. The accuracy of the model to simulate RC column responses to blast loads is
verified by comparing the numerical simulation results with the tests results available in the literature.
Dynamic response and damage of RC columns with different FRP strengthening measures are then
calculated using the developed numerical model. The residual axial-load carrying capacity is utilized to
quantify the damage level since the columns are primarily designed to carry the axial loads. Parametric
studies are performed to examine the influence of column dimension, concrete strength, steel reinforcement
ratios, FRP thickness and FRP strength on the P-I diagrams. The empirical formulae are derived
based on numerical results to predict the impulse and pressure asymptote of P-I diagrams. These
empirical formulae can be straightforwardly used to construct P-I diagrams for assessment of blast
loading resistance capacities of RC columns with different FRP strengthening measures.