Abstract: Blast loads on reinforced concrete (RC) columns under near-field explosions are highly non-linear due to wave-structure interaction, posing a challenge for existing methods to maintain both precision and efficiency. This study investigates the dynamic blast loading process on the front, side, and rear faces of square RC columns using fluid-structure interaction numerical simulations. By considering blast conditions and structural geometric features, a simplified load prediction model incorporating clearing effects and time-of-arrival differences was established. Based on this model, a highly efficiency analysis method for dynamic response of square RC columns under near-field blasts was further proposed. Comparative analysis demonstrates that the proposed method achieves a predictive accuracy consistent with fluid-structure interaction simulations while reducing computational costs by over 90%. This research provides valuable insights into the blast performance analysis and rapid engineering assessment of RC columns.