Assessment of design procedures for the use of externally bonded FRP composites in shear strengthening of reinforced concrete beams

Pellegrino, Carlo; Vasic, Mira

doi:10.1016/j.compositesb.2012.07.039

Cited by 91 publications

(46 citation statements)

References 37 publications

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“…EB-FRP repair and strengthening can be executed in three types of applications: confinement, flexural and shear strengthening [3], [19]- [21].The behaviour of the first two types of applications (i.e. confinement and flexural strengthening) is well understood however the shear strengthening using EB-FRP (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Repair of reinforced concrete beams using carbon fiber reinforced polymer

et al. 2017

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Abstract. This research paper is part of an ongoing research on the behaviour of Reinforced Concrete (RC) beams retrofitted with Externally Bonded Carbon Fiber Reinforced Polymer (EB-CFRP). A total of 5 largescale rectangular beams, previously damaged due to shear loading, were repaired and strengthened with EB-CFRP and tested in this study. The major cracks of the damaged beams were injected with epoxy and the beams were wrapped with 2 layers of EB-CFRP discrete strips with 100mm width and 150mm center to center spacing. The beams were instrumented and tested to failure under three points loading in simply supported configuration. The measured test parameters were the beams deflection, maximum load, and the strain in the FRP strips. The failure mode was also observed. The results showed that applying EB-FRP strips increased the shear strength significantly relative to the original shear capacity of the beam. The results demonstrate that the application of EB-FRP strips used in this study is an effective repair method that can be used to repair and strengthen damaged beams.

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Section: Introductionmentioning

confidence: 99%

“…corrosion, freeze-thaw, etc. ), and other deteriorating factors can decrease the service life of the structures [1]- [3]. Therefore, repair and retrofitting of these deteriorated structures is essential to maintain and extend their designed service life [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Repair of reinforced concrete beams using carbon fiber reinforced polymer

et al. 2017

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“…This enthusiasm was due to the attractive characteristics of FRP, such as high strength-to-density ratios, chemical and corrosion resistance, and easy construction and handling. Many valuable research studies on strengthening of RC beams with FRP composites have been conducted (e.g., Uji 1992;Al-Sulaimani et al 1994;Sato et al 1996;Taerwe et al 1997;Täljsten 1997;Chaallal et al 1998;Triantafillou 1998;Khalifa et al 1998;Pellegrino and Modena 2008;Galal and Mofidi 2010;Chen et al 2013;Mofidi et al 2013a, b;and Pellegrino and Vasic 2013). However, recent findings have highlighted major influential parameters related to shear strengthening with externally-bonded (EB) FRP that have still not been captured by current predictive models, including standard codes and guidelines (Mofidi and Chaallal 2011a, b).…”

Section: Introductionmentioning

confidence: 99%

Tests and Design Provisions for Reinforced-Concrete Beams Strengthened in Shear Using FRP Sheets and Strips

Mofidi

Chaallal

2014

Int J Concr Struct Mater

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Numerous investigations of RC beams strengthened in shear with externally-bonded (EB) fibre-reinforced polymer (FRP) sheets, plates and strips have been successfully conducted in recent years. These valuable studies have highlighted a number of influencing parameters that are not captured by the design guidelines. The objective of this study was: (1) to highlight experimentally and analytically the influential parameters on the shear contribution of FRP to RC beams strengthened in shear using EB FRP sheets and strips; and (2) to develop a set of transparent, coherent, and evolutionary design equations to calculate the shear resistance of RC beams strengthened in shear. In the experimental part of this study, 12 tests were performed on 4,520-mmlong T-beams. The specimens were strengthened in shear using carbon FRP (CFRP) strips and sheets. The test variables were: (1) the presence or absence of internal transverse-steel reinforcement; (2) use of FRP sheets versus FRP strips; and (3) the axial rigidity of the EB FRP reinforcement. In the analytical part of this study, new design equations were proposed to consider the effect of transverse-steel in addition to other influential parameters on the shear contribution of FRP. The accuracy of the proposed equations has been verified in this study by predicting the FRP shear contribution of experimentally tested RC beams.

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“…Moreover, many design procedures and analytical models have been conducted to date either for the use of EB FRP composites in shear strengthening or for the evaluation of the FRP-concrete bond strength. Databases for the assessment of these conducted studies have been recently published by Pellegrino and Vasic [36] and by D'Antino and Pellegrino [19]. Few studies have been conducted on RC beams strengthened in shear using EB CFRP composites under fatigue loading, by Czaderski and Motavalli [18], Williams and Higgins [42], Chaallal et al [10], and recently by Bae et al [5].…”

Section: Introductionmentioning

confidence: 96%