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In recent years, fiber-reinforced polymers (FRP) have become a popular choice for retrofitting multi-story residential buildings and other structures. However, the effectiveness of FRP largely depends on factors such as shape and bond. This study evaluates the efficiency of FRP retrofitting for square short reinforced concrete (RC) damaged columns, considering parameters like slenderness ratios, concrete grades, and FRP types. Numerical simulations closely match experimental data, with an error of only 2.02% in maximum load capacity. Results indicate the superiority of carbon fiber-reinforced polymer (CFRP) over glass fiber-reinforced polymer (GFRP) confinement. CFRP retrofitting achieves up to three times strength enhancement for M20 concrete grade and 1.5–2.3 times improvement for M30 grade. Effectiveness of FRP confinement increases with higher slenderness ratios (2 and 3); however, it slightly decreases for a slenderness ratio of 4. Maximum effectiveness achieved for CFRP confinement is 13.15%, and for GFRP confinement, it is 7.90% compared to unconfined columns. Slenderness ratio increase from 2 to 4 has insignificant influence on load-carrying capacity. The results of this study provide the way for further investigation into damaged columns on a full-scale basis.

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Numerical Modeling of Uniaxial Compression Behaviour in FRP-Retrofitted RC Square Columns

  • 会议论文

  • 发表日期：

    2025年

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  • Prem Kumar Akula,
  • Anant Parghi,
  • Mayank Patel,
  • M. H. Lunagaria

摘要

In recent years, fiber-reinforced polymers (FRP) have become a popular choice for retrofitting multi-story residential buildings and other structures. However, the effectiveness of FRP largely depends on factors such as shape and bond. This study evaluates the efficiency of FRP retrofitting for square short reinforced concrete (RC) damaged columns, considering parameters like slenderness ratios, concrete grades, and FRP types. Numerical simulations closely match experimental data, with an error of only 2.02% in maximum load capacity. Results indicate the superiority of carbon fiber-reinforced polymer (CFRP) over glass fiber-reinforced polymer (GFRP) confinement. CFRP retrofitting achieves up to three times strength enhancement for M20 concrete grade and 1.5–2.3 times improvement for M30 grade. Effectiveness of FRP confinement increases with higher slenderness ratios (2 and 3); however, it slightly decreases for a slenderness ratio of 4. Maximum effectiveness achieved for CFRP confinement is 13.15%, and for GFRP confinement, it is 7.90% compared to unconfined columns. Slenderness ratio increase from 2 to 4 has insignificant influence on load-carrying capacity. The results of this study provide the way for further investigation into damaged columns on a full-scale basis.