Flexural Strengthening of Concrete Structures Using Externally Bonded and Unbonded Prestressed CFRP Laminates: A Literature Review

Havez, Amr Abdel; Al-Mayah, Adil

doi:10.1061/jccof2.cceng-4053

Cited by 8 publications

(2 citation statements)

References 50 publications

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“…To eliminate the issues associated with corrosion, FRPs are used instead of steel in external tendons, though anchoring the external FRP tendons is still a big problem. Several studies are available in which this technique (EP) has been used [ 210 ]. Gao et al [ 211 ] tested six slab samples, including one reference slab without EP, to evaluate the feasibility and effectiveness of the new structural strengthening method.…”

Section: Strengthening Techniquesmentioning

confidence: 99%

A State-of-the-Art Review on Structural Strengthening Techniques with FRPs: Effectiveness, Shortcomings, and Future Research Directions

Hammad,

Bahrami,

Khokhar

et al. 2024

Materials

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In the pursuit of creating more sustainable and resilient structures, the exploration of construction materials and strengthening methodologies is imperative. Traditional methods of relying on steel for strengthening proved to be uneconomical and unsustainable, prompting the investigation of innovative composites. Fiber-reinforced polymers (FRPs), known for their lightweight and high-strength properties, gained prominence among structural engineers in the 1980s. This period saw the development of novel approaches, such as near-surface mounted and externally bonded reinforcement, for strengthening of concrete structures using FRPs. In recent decades, additional methods, including surface curvilinearization and external prestressing, have been discovered, demonstrating significant additional benefits. While these techniques have shown the enhanced performance, their full potential remains untapped. This article presents a comprehensive review of current approaches employed in the fortification of reinforced cement concrete structures using FRPs. It concludes by identifying key areas that warrant in-depth research to establish a sustainable methodology for structural strengthening, positioning FRPs as an effective replacement for conventional retrofitting materials. This review aims to contribute to the ongoing discourse on modern structural strengthening strategies, highlight the properties of FRPs, and propose avenues for future research in this dynamic field.

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Section: Strengthening Techniquesmentioning

confidence: 99%

A State-of-the-Art Review on Structural Strengthening Techniques with FRPs: Effectiveness, Shortcomings, and Future Research Directions

Hammad,

Bahrami,

Khokhar

et al. 2024

Materials

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show abstract

“…These beams are subjected to cyclic loads or are exposed to corrosive conditions over time, which ultimately results in the accumulation of damage and a decline in performance [1]. Extensive research spanning decades has demonstrated that the application of external prestressing techniques not only enhances the structural flexural and shear capacity but also contributes to an improvement in rigidity [2][3][4]. Researchers have initiated the evaluation and application of fiber-reinforced polymer (FRP) tendons as a viable and environmentally friendly substitute for traditional steel reinforcement, owing to the notable progress in FRP tendon manufacturing technology [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flexural and Shear Performance of Concrete Beams Strengthened with Prestressed CFRP Tendons

Wang,

Jiang

et al. 2024

Applied Sciences

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To investigate the influence of external prestressing with carbon fiber-reinforced polymer (CFRP) tendons on the flexural and shear performance of reinforced concrete beams, a total of six simply supported beams with a length of 3.5 m and two two-span continuous beams with a length of 7 m were studied. The influences of the prestressing level of CFRP tendons, the pattern of straight-line and flexural reinforcement of externally prestressed CFRP tendons, and the existence of initial cracks in the beams on the flexural bearing capacity of the reinforced beams were explored through modeling tests. The calculating equation for anticipating the ultimate flexural bearing capacity of concrete beams reinforced with externally prestressed CFRP tendons was modified based on the test results. The findings indicate that the flexural bearing capacity of the test beams was significantly enhanced through both flexural and straight-line reinforcement. Specifically, the ultimate flexural bearing capacity of the simply supported beams exhibited improvements of approximately 160% and 170%, respectively, whereas the ultimate flexural bearing capacity of the continuous beams was enhanced by approximately 113% through the reinforcement of flexural arrangement. Additionally, the shear resistance capacity of the concrete beams was notably improved through the flexural arrangement reinforcement, and the shear resistance capacity of the beams exhibited a substantial increase as the prestressing level of the CFRP tendons increased. The flexural moments in the vicinity of the support point of the reinforced beam exhibited an increase ranging from 41.7% to 112.5% when the stirrup strains started to escalate rapidly. Additionally, the rigidity of the test beams showed a close correlation with both the prestressing level and the existence of initial cracks.

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Seismic Retrofit of Reinforced Concrete Structures Using Fibre Reinforced Polymer

Ghosh,

Ray,

Biswas

2024

Composites Science and Technology

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Flexural Strengthening of Concrete Structures Using Externally Bonded and Unbonded Prestressed CFRP Laminates: A Literature Review

Cited by 8 publications

References 50 publications

A State-of-the-Art Review on Structural Strengthening Techniques with FRPs: Effectiveness, Shortcomings, and Future Research Directions

A State-of-the-Art Review on Structural Strengthening Techniques with FRPs: Effectiveness, Shortcomings, and Future Research Directions

Experimental Study on the Flexural and Shear Performance of Concrete Beams Strengthened with Prestressed CFRP Tendons

Seismic Retrofit of Reinforced Concrete Structures Using Fibre Reinforced Polymer

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