Static Load Testing and Mechanical Property Interpretation of RC Beams Strengthened with CFRP Plates

Weifeng Li

doi:10.6919/ICJE.202510_11(10).0012

Authors

Weifeng Li

DOI:

https://doi.org/10.6919/ICJE.202510_11(10).0012

Keywords:

Prestressed CFRP Plates; Reinforced Concrete Beams; Static Behavior; Anchorage Methods; Structural Strengthening; Finite Element Modeling; Load-Bearing Enhancement; Crack Distribution.

Abstract

This paper explores the static behavior of reinforced concrete (RC) beams strengthened with prestressed CFRP plates through a combination of laboratory testing and finite element modeling. Three specimens were prepared: two strengthened beams employing different anchorage methods (rigid self-locking and force-card types) and one unstrengthened reference beam. The study focused on evaluating cracking load, ultimate bearing capacity, and deformation responses. The findings indicate that the use of prestressed CFRP plates markedly enhances beam performance. Specifically, the cracking load increased by about 60%, while the ultimate capacity improved by 32% and 50% for the respective anchorage systems. A high degree of deformation compatibility between the CFRP plates and concrete was observed. Strengthened beams displayed a denser crack pattern and better utilization of concrete strength, though accompanied by reduced ductility. The finite element simulations corroborated the experimental data and further highlighted the three distinct behavioral stages of the beams: elastic, cracking, and yielding. Overall, the research establishes a solid theoretical foundation for the application of prestressed CFRP plate reinforcement in engineering practice and demonstrates that the force-card anchorage system provides superior performance in stress transmission and failure mode control.

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