Experimental Investigation on the Failure Behavior of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Reinforced Concrete T-beams

Junaedi Utomo,Windu Partono,Muhammad Nur Khusyeni,Buntara S Gan,Ay Lie Han

doi:10.9744/ced.23.2.115-122

Abstract

Carbon Fiber Reinforced Polymers (CFRP) are widely used as external concrete reinforcement. The behavior of T-beams strengthened in shear and flexure using CFRP sheets and plates was studied to analyze the load carrying capacity and failure mode as compared to conventional concrete members. The bonding response of the plate-to-concrete was investigated by comparing a specimen with a plate anchored at the far ends, one without anchoring. The sheets were in situ wet lay-up, the plate was pre-impregnated and pultruded during manufacturing. The test result suggested that this integrated strengthening method notably improved the load-carrying capacity, it was also demonstrated that anchoring had a positive but insignificant effect on the moment capacity and deformation. The influence of anchoring was noteworthy from the point of view that it shifted the failure mode from debonding to CFRP plate rupture. The most important factors influencing the behavior of CFRP strengthened beams are outlined.

Highlights

The use of Fiber Reinforced Polymer (FRP) as external reinforcement has seen a rapid evolution during the past three decades
The results suggest that the combination of shear and flexure reinforcement improved the ultimate loadcarrying capacity of a member at ultimate up until 28%
The load-carrying capacity, vertical deflection, and failure mode was studied and it was concluded that: The system significantly improved the overall performance of the member

Summary

Introduction

The use of Fiber Reinforced Polymer (FRP) as external reinforcement has seen a rapid evolution during the past three decades. While the first stages of the composite action between FRP and concrete were hindered by the loss of compatibility due to debonding, the majority of these issues have been resolved. The fact is that the interface between the FRP and the concrete remains the weak link in the system. When debonding problems could be overcome, FRP external reinforcement has the potential of even better load-carrying capacity, stiffness, and ductility enhancement. Numerous researches have been carried out on reinforced FRP concrete, the majority focused on flexure and shear. The use of FRP plates, in particular, could be found in the work of Liu et al (2020), El-zeadani et al

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Conclusion