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The efficacy of externally bonded fibre-reinforced polymer (FRP) systems for reinforcing old unbonded post-tensioned concrete (UPC) beams remains unexplored. This experimental research aims to address this gap. The experiment involved four UPC beams, i.e., one new beam and three old beams (aged more than 6.5 years). External FRP sheets proved effective in restoring the deteriorated functionality of the old UPC beams and improving their performance. By resisting tensile stresses and increasing flexural stiffness, FRP reinforcement significantly improved the old beams’ behaviour in terms of deflection and load-carrying capacity. The FRP-strengthened old beams outperformed the new beam, especially in the ultimate stage.

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Strengthening Old Post-tensioned Concrete Beams Using External FRP Sheets

  • 会议论文

  • 发表日期：

    2026年

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  • Phuong Phan-Vu,
  • Dinh Trung Nghia Pham

摘要

The efficacy of externally bonded fibre-reinforced polymer (FRP) systems for reinforcing old unbonded post-tensioned concrete (UPC) beams remains unexplored. This experimental research aims to address this gap. The experiment involved four UPC beams, i.e., one new beam and three old beams (aged more than 6.5 years). External FRP sheets proved effective in restoring the deteriorated functionality of the old UPC beams and improving their performance. By resisting tensile stresses and increasing flexural stiffness, FRP reinforcement significantly improved the old beams’ behaviour in terms of deflection and load-carrying capacity. The FRP-strengthened old beams outperformed the new beam, especially in the ultimate stage.