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<p>In recent decades, the rise of terrorist activities targeting critical structures worldwide has highlighted the significance of blast loads. Most original installation designs did not consider blast loads, underscoring the need to protect strategic buildings from explosion hazards. Explosions typically occur at ground level, so improving the structural integrity of the lower-floor columns is critical to improving a building's blast resistance. This research conducts numerical simulations to assess the effects of different retrofitting methods on the blast resistance of reinforced concrete (RC) columns. The simulations of RC columns are advanced, utilizing LS-DYNA finite element (FE) software. The FE modeling was then validated using blast field tests from previous works. Three retrofitting methods are proposed: carbon fiber-reinforced polymer (CFRP) wrapping, RC-jacketing, and steel-jacketing. Parametric studies are conducted to examine how scaled distance, axial compressive force, and column dimension affect the blast resistance of the RC columns. Findings indicate that CFRP-wrapping and steel-jacketing enhance the blast resistance of RC columns with relatively high flexural strength when subjected to close-range explosions. Conversely, the RC-jacketing method is most effective for columns with relatively lower flexural strength facing medium- and far-field explosions. The study also revealed that the axial load substantially affects the blast resistance of RC columns, and increasing the standoff distance exponentially reduces the peak lateral displacement, thereby mitigating the damage to the columns.</p>

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Evaluating RC column retrofitting methods exposed to near- and far-field blast loadings: a numerical study

  • 期刊论文

  • 发表日期：

    2025年3月2日

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  • Mohammed Hemeda,
  • Walid Attia

摘要

In recent decades, the rise of terrorist activities targeting critical structures worldwide has highlighted the significance of blast loads. Most original installation designs did not consider blast loads, underscoring the need to protect strategic buildings from explosion hazards. Explosions typically occur at ground level, so improving the structural integrity of the lower-floor columns is critical to improving a building's blast resistance. This research conducts numerical simulations to assess the effects of different retrofitting methods on the blast resistance of reinforced concrete (RC) columns. The simulations of RC columns are advanced, utilizing LS-DYNA finite element (FE) software. The FE modeling was then validated using blast field tests from previous works. Three retrofitting methods are proposed: carbon fiber-reinforced polymer (CFRP) wrapping, RC-jacketing, and steel-jacketing. Parametric studies are conducted to examine how scaled distance, axial compressive force, and column dimension affect the blast resistance of the RC columns. Findings indicate that CFRP-wrapping and steel-jacketing enhance the blast resistance of RC columns with relatively high flexural strength when subjected to close-range explosions. Conversely, the RC-jacketing method is most effective for columns with relatively lower flexural strength facing medium- and far-field explosions. The study also revealed that the axial load substantially affects the blast resistance of RC columns, and increasing the standoff distance exponentially reduces the peak lateral displacement, thereby mitigating the damage to the columns.