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<p>This study presents experimental and numerical investigations of the structural behavior of reinforced concrete (RC) slabs exposed to blast loading at three different scaled distances: 0.83&#xa0;m/kg<sup>1/3</sup>, 0.42&#xa0;m/kg<sup>1/3</sup>, and 0.21&#xa0;m/kg<sup>1/3</sup>. Two blast loading techniques, Load Blast Enhanced (LBE) and Structured Arbitrary Lagrangian-Eulerian (SALE), implemented in LS-DYNA, were evaluated by comparing numerical blast pressures and accelerations with test data from the largest scaled distance test. For the rest of the cases, the numerical models were compared with the failure mechanism and with the size of the damage produced in the tests. The SALE model, combined with the concrete material models Karagozian &amp; Case (K&amp;C) and Continuous Surface Cap Model (CSCM), effectively captured the dynamic behavior of RC slabs, including failure mechanisms. The study also examined three different explosive shapes (cube, cylinder, and bag) aimed at resolving uncertainties in the explosive geometry used in the experiments. Numerical simulations at intermediate and small scaled distances demonstrated that the cubic and bag-shaped explosives, particularly when used in conjunction with the K&amp;C model, accurately reproduced the damage patterns observed in the RC slabs during close-in explosions. These findings highlight SALE coupled with K&amp;C/CSCM as the most robust and reliable modeling strategy for blast analysis of RC structure.</p>

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Comparative Evaluation of Blast Load Modeling Techniques for RC Slabs Using Field Tests

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • M. Lee,
  • R. Castedo,
  • A. P. Santos,
  • A. Prado,
  • A. Alañón,
  • L. M. López,
  • M. Chiquito

摘要

This study presents experimental and numerical investigations of the structural behavior of reinforced concrete (RC) slabs exposed to blast loading at three different scaled distances: 0.83 m/kg1/3, 0.42 m/kg1/3, and 0.21 m/kg1/3. Two blast loading techniques, Load Blast Enhanced (LBE) and Structured Arbitrary Lagrangian-Eulerian (SALE), implemented in LS-DYNA, were evaluated by comparing numerical blast pressures and accelerations with test data from the largest scaled distance test. For the rest of the cases, the numerical models were compared with the failure mechanism and with the size of the damage produced in the tests. The SALE model, combined with the concrete material models Karagozian & Case (K&C) and Continuous Surface Cap Model (CSCM), effectively captured the dynamic behavior of RC slabs, including failure mechanisms. The study also examined three different explosive shapes (cube, cylinder, and bag) aimed at resolving uncertainties in the explosive geometry used in the experiments. Numerical simulations at intermediate and small scaled distances demonstrated that the cubic and bag-shaped explosives, particularly when used in conjunction with the K&C model, accurately reproduced the damage patterns observed in the RC slabs during close-in explosions. These findings highlight SALE coupled with K&C/CSCM as the most robust and reliable modeling strategy for blast analysis of RC structure.