Effect of CFRP strengthening systems on the fatigue limit of reinforced concrete beams

Eljufout, Tamer; Toutanji, Houssam; Al-Qaralleh, Mohammad

doi:10.1080/15732479.2020.1751665

Cited by 11 publications

(2 citation statements)

References 26 publications

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“…Furthermore, it is imperative to conduct more investigation into the fatigue performance of FRP-strengthened beams and its associated influencing factors. The impact of CFRP strengthening techniques on the fatigue limit of RC beams was investigated (Eljufout et al, 2021), wherein CFRP strengthening effectively redistributed applied stresses and mitigated stress concentrations. Notably, NSM CFRP rods and EB CFRP sheets exhibited a remarkable enhancement in fatigue limit by 19% and 33%, respectively, compared to non-strengthened RC beams.…”

Section: Introductionmentioning

confidence: 99%

Flexural behavior of reinforced concrete beams strengthened with gradually prestressed near surface mounted carbon fiber-reinforced polymer strips under static and fatigue loading

Gong,

Su,

Zhang

et al. 2024

Advances in Structural Engineering

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The near surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strengthening technique, combined with gradually anchored prestressed technique, is utilized to delay the occurrence of concrete cover separation (CCS) and enhance the ductility of reinforced concrete beams. The load-carrying capacity of fully prestressed beams and gradually prestressed beams are investigated under both static and fatigue loading conditions. The study focused on the effect of gradient prestress on flexural behavior of strengthened beams, analyzed the failure mode, characteristic load, ductility, and stress distribution at CFRP-concrete interface under both prestress and load conditions. Results indicate that gradually prestressed beams outperform fully prestressed ones in restraining crack development, delaying yield of tensile reinforcement, improving bearing capacity and avoiding CCS failure. Bearing capacity was significantly increased by up to 35.48%, while ductility was greatly improved by 100.33% with ultimate deflection for gradually prestressed beams compared to fully prestressed ones. The fatigue life of gradually prestressed beams, which experienced a transition from CCS failure mode to fatigue fracture of tensile reinforcement, was significantly extended. Additionally, their ductility at failure was also greatly enhanced, thus confirming the effectiveness of gradually prestressed NSM CFRP strengthening technique.

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Section: Introductionmentioning

confidence: 99%

Flexural behavior of reinforced concrete beams strengthened with gradually prestressed near surface mounted carbon fiber-reinforced polymer strips under static and fatigue loading

Gong,

Su,

Zhang

et al. 2024

Advances in Structural Engineering

View full text Add to dashboard Cite

show abstract

“…The strengthening effects of CFRP on concrete with lower strength are more significant. It has been shown that the initial cracking load, ultimate bearing capacity, fatigue limit and shear strength of concrete beams strengthened by CFRP can increase by about 40%, 67%, 33%, and 25%-114%, respectively (Colalillo & Sheikh, 2012;Eljufout et al, 2021;Helal et al, 2020). Therefore, considering the advantages and good strengthening effect of CFRP, it can be a preferred technology for strengthening concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Study on Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP

Ji,

Sun,

Chen

et al. 2024

Int J Concr Struct Mater

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With the development of recycled aggregate concrete (RAC), the recovery rate of construction waste is improved, and the pollution problem is alleviated. In particular, RAC beams strengthened with prestressed carbon fiber reinforced plastics (CFRP) can exhibit improved mechanical properties, expanding RAC application. Four groups of reinforced RAC beam specimens contained 0%, 40%, 70%, and 100% recycled coarse aggregate, respectively. Each group of beams was first pre-cracked and then strengthened by prestressed CFRP with one layer and two layers respectively. Finally, the bearing capacity tests were performed for these beams. The test results show that as the recycled coarse aggregate content increases, the cracking moment and ultimate load capacity of the beam decrease, while its crack width increases. As the CFRP layer increases, the deformation and crack width of the beam decreases, while the number of cracks increases. The prestressed CFRP also exhibited tensile and peeling failure. A beam deflection calculation model was established by introducing a coefficient k representing the interaction between recycled aggregate and CFRP. The influence coefficient of concrete elongation on the crack width and average crack spacing of the beam was modified, and the crack width analysis model of the beam was established. The calculated results are in good agreement with the experimental observations. It can provide reference for the application and design of recycled concrete beams strengthened with prestressed CFRP.

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Prediction of Deflection Progression of RC Beams Strengthened with NSM FRP Composites

Eljufout

Toutanji

2021

Lecture Notes in Civil Engineering

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Effect of CFRP strengthening systems on the fatigue limit of reinforced concrete beams

Cited by 11 publications

References 26 publications

Flexural behavior of reinforced concrete beams strengthened with gradually prestressed near surface mounted carbon fiber-reinforced polymer strips under static and fatigue loading

Flexural behavior of reinforced concrete beams strengthened with gradually prestressed near surface mounted carbon fiber-reinforced polymer strips under static and fatigue loading

Study on Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP

Prediction of Deflection Progression of RC Beams Strengthened with NSM FRP Composites

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