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Open AccessReview

Strength Degradation in Curved Fiber-reinforced Polymer (FRP) Bars Used as Concrete Reinforcement

1
School of Engineering and Technology, and Center of Excellence in Sustainable Disaster Management, Walailak University, Nakhonsithammarat 80161, Thailand
2
School of Engineering, The University of Warwick, Coventry CV4 7AL, UK
3
Department of Civil and Structural Engineering, The University of Sheffield, Sheffield S1 3JD, UK
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(8), 1653; https://doi.org/10.3390/polym12081653
Received: 26 June 2020 / Revised: 21 July 2020 / Accepted: 21 July 2020 / Published: 24 July 2020
(This article belongs to the Special Issue Reinforced Polymer Composites II)
Steel reinforcements in concrete tend to corrode and this process can lead to structural damage. Fiber-reinforced polymer (FRP) reinforcements represent a viable alternative for structures exposed to aggressive environments and have many possible applications where superior corrosion resistance properties are required. The use of FRP rebars as internal reinforcements for concrete, however, is limited to specific structural elements and does not yet extend to the whole structure. The reason for this relates to the limited availability of curved or shaped reinforcing FRP elements on the market, as well as their reduced structural performance. This article presents a state-of-the art review on the strength degradation of curved FRP composites, and also assesses the performance of existing predictive models for the bend capacity of FRP reinforcements. Previous research has shown that the mechanical performance of bent portions of FRP bars significantly reduces under a multiaxial combination of stresses. Indeed, the tensile strength of bent FRP bars can be as low as 25% of the maximum tensile strength developed in a straight counterpart. In a significant number of cases, the current design recommendations for concrete structures reinforced with FRP were found to overestimate the bend capacity of FRP bars. A more accurate and practical predictive model based on the Tsai–Hill failure criteria is also discussed. This review article also identifies potential challenges and future directions of research for exploring the use of curved/shaped FRP composites in civil engineering applications. View Full-Text
Keywords: Curved FRP bars; bent fiber-reinforced polymer (FRP); bend capacity; bend strength; bent test; strength and testing of materials; material characterization Curved FRP bars; bent fiber-reinforced polymer (FRP); bend capacity; bend strength; bent test; strength and testing of materials; material characterization
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MDPI and ACS Style

Imjai, T.; Garcia, R.; Guadagnini, M.; Pilakoutas, K. Strength Degradation in Curved Fiber-reinforced Polymer (FRP) Bars Used as Concrete Reinforcement. Polymers 2020, 12, 1653. https://doi.org/10.3390/polym12081653

AMA Style

Imjai T, Garcia R, Guadagnini M, Pilakoutas K. Strength Degradation in Curved Fiber-reinforced Polymer (FRP) Bars Used as Concrete Reinforcement. Polymers. 2020; 12(8):1653. https://doi.org/10.3390/polym12081653

Chicago/Turabian Style

Imjai, Thanongsak; Garcia, Reyes; Guadagnini, Maurizio; Pilakoutas, Kypros. 2020. "Strength Degradation in Curved Fiber-reinforced Polymer (FRP) Bars Used as Concrete Reinforcement" Polymers 12, no. 8: 1653. https://doi.org/10.3390/polym12081653

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