Shear Strengthening of RC Beams by Externally Bonded Side CFRP Strips

Chaallal, Omar; Nollet, Marie‐José; Perraton, Daniel

doi:10.1061/(asce)1090-0268(1998)2:2(111)

Cited by 151 publications

(47 citation statements)

References 2 publications

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“…The database consisted of 30 beams reinforced in shear with only CFRP (six beams from this study, five beams from Adhikary and Mutsuyoshi (2004) (B-4 to B-8 inclusive), eight beams from Nanni (2002, 2000) (BT2 to BT5 inclusive and SO3-2 to SO3-4 and SO4-2), nine beams from Triantafillou (1998) (S1a, S1b, S2a, S2b, S3a, S36b, S1-45 to S3-45) and two beams from Zhang and Hsu (2005) (Z4 45, Z4 90)) and 20 beams with CFRP and steel shear reinforcement (four beams from Chaallal et al (1998), all 11 beams from Pelligrino and Modena (2002) and five beams from Monti and Liotta (2007) (UF90, UF45+A, UF45+D, WS45+, UF90)). The beams of Monti and Liotta (2007) and Pelligrino and Modena (2002) are not included in Table 1.…”

Section: Application Of Eurocodementioning

confidence: 99%

Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

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The current paper reviews existing design guidelines for strengthening beams in shear with carbon fibre reinforced polymer (CFRP) sheets and proposes a modification to Concrete Society Technical Report TR55. It goes on to present the results of an experimental programme which evaluated the contribution of CFRP sheets towards the shear strength of continuous reinforced concrete (RC) beams. A total of seven, two-span concrete continuous beams with rectangular cross-sections were tested. The control beam was not strengthened, and the remaining six were strengthened with different arrangements of CFRP sheets. The experimental results show that the shear strength of the beams was significantly increased by the CFRP sheet and that it is beneficial to orientate the FRP at 458 to the axis of the beam. The shear strength of FRP strengthened beams is usually calculated by adding individual components of shear resistance from the concrete, steel stirrups and FRP. The superposition method of design is replaced in Eurocode 2 by the variable angle truss model in which all the shear is assumed to be resisted by the truss mechanism. The current paper proposes a methodology for strengthening beams with FRP that is consistent with Eurocode 2.

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Section: Application Of Eurocodementioning

confidence: 99%

Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

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“…Adopting the EBR technique, several researchers have verified that the shear resistance of concrete beams can significantly be increased [1][2][3][4][5][6]. However, due to premature debonding of the FRP, the maximum strain mobilized by these systems is well below their ultimate strain.…”

Section: Introductionmentioning

confidence: 99%

Near surface mounted CFRP laminates for shear strengthening of concrete beams

Barros

Dias

2006

Cement and Concrete Composites

164

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A Near Surface Mounted (NSM) strengthening technique was developed to increase the shear resistance of concrete beams. The NSM technique is based on fixing, by epoxy adhesive, Carbon Fiber Reinforced Polymer (CFRP) laminates into pre-cut slits opened in the concrete cover of lateral surfaces of the beams. To assess the efficacy of this technique, an experimental program of four-point bending tests was carried out with reinforced concrete beams failing in shear. Each of the four tested series was composed of five beams: without any shear reinforcement; reinforced with steel stirrups; strengthened with strips of wet lay-up CFRP sheets, applied according to the externally bonded reinforcement (EBR) technique; and two beams strengthened with NSM precured laminates of CFRP, one of them with laminates positioned at 90°and the other with laminates positioned at 45°in relation to the beam axis. Influences of the laminate inclination, beam depth and longitudinal tensile steel reinforcement ratio on the efficacy of the strengthening techniques were analyzed. Amongst the CFRP strengthening techniques, the NSM with laminates at 45°was the most effective, not only in terms of increasing beam shear resistance but also in assuring larger deformation capacity at beam failure. The NSM was also faster and easier to apply than the EBR technique. The performance of the ACI and fib analytical formulations for the EBR shear strengthening was appraised. In general, the contribution of the CFRP systems predicted by the analytical formulations was slightly larger than the values registered experimentally. Performance of the formulation by Nanni et al. for NSM strengthening technique was also appraised. Using bond stress and CFRP effective strain values obtained in pullout bending tests with NSM CFRP laminate system, the formulation by Nanni et al. predicted a contribution of this CFRP system for the beam shear resistance of 72% the experimentally recorded values.

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“…The technique of strengthening reinforced concrete buildings by externally bonded FRP laminates was started in 1980s and has since attracted many researchers around the world. It was investigated in the USA [3 -8], Switzerland [9], Greece, Canada [10,11], Japan and several other European countries. Norris et al (1997) [12], presented the results of an experimental and analytical study of the behavior of damaged or understrength concrete beams retrofitted with thin carbon fiber reinforced plastic (CFRP) sheets.…”

Section: Related Studiesmentioning

confidence: 99%

Structural Behavior of Strengthened RC Beams in Shear using CFRP Strips

Ibrahim¹,

Mansor²,

Hameed³

2017

TOCIEJ

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Carbon fiber reinforced polymers (CFRP) were widely used in strengthening of reinforced concrete members in the last few years. Experimental and theoretical investigations were carried out to find the behavior of reinforced concrete beams strengthened in shear by CFRP strips. Six beams measured of 200x300x2000mm were investigated. The variables investigated in this work are orientation (vertical and inclined) and the spacing between CFRP strips.It was found that the strengthening by CFRP strips increased the crack, yield and ultimate load by 10%, 71% and 77% respectively on average. Inclined CFRP strips show a better performance than vertical CFRP strips with same distances and increase the yield and ultimate load by 11% and 13% respectively on average. By covering all faces of specimen with CFRP strips, the yield and ultimate load increased by 82% and 95% respectively. Using the CFRP strips changed the failure model from shear to flexural by increasing the shear strength, so the ductility was increased by 198% on average. CFRP increased the strain in compression face of concrete and the value was greater than (0.003). For all strengthened specimens, there was no effect on CFRP strips.

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Shear Strengthening of RC Beams by Externally Bonded Side CFRP Strips

Cited by 151 publications

References 2 publications

Shear strengthening of reinforced concrete beams with CFRP

Shear strengthening of reinforced concrete beams with CFRP

Near surface mounted CFRP laminates for shear strengthening of concrete beams

Structural Behavior of Strengthened RC Beams in Shear using CFRP Strips

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