Shear strengthening of reinforced concrete beams with CFRP

Bukhari, Imran A.; Vollum, Robert L.; Ahmad, Sohail; Sagaseta, Juan

doi:10.1680/macr.2008.62.1.65

Cited by 101 publications

(48 citation statements)

References 11 publications

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“…[1]- [7], [9]- [13]. It is worth nothing that several experimental and analytical researches have been conducted since 1990s, to investigate the technique and behaviour of this new technology and establish its effectiveness [12]- [18]. Based on these studies some guidelines are developed [21]- [23].…”

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%

“…confinement and flexural strengthening) is well understood however the shear strengthening using EB-FRP (i.e. full wrapping, U-jacketing, side bonding and near surface mounted (NSM) in vertical or inclined orientation) is still a matter of further research [12], [18], [22]- [24].…”

Section: Introductionmentioning

confidence: 99%

Repair of reinforced concrete beams using carbon fiber reinforced polymer

et al. 2017

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“…The model is based on a weak compatibility condition, since a rough assumption about the strain of all of the stirrups is made: in fact, to account for the unknown value of the stress and strain of all of the stirrups crossing the crack, a reduction coefficient α 0.75  is introduced. Bukhari et al [11] presented a detailed review of the models proposed by current codes-ACI 2008 and Eurocode 2 [1,12]-pointing out that the shear strength so calculated does not match the values of experimental results when considering varied typologies-mechanical and geometrical properties-of structural elements. Even if some limits of the current design approaches are analyzed and the importance of the interaction between steel and FRP is highlighted, a design approach is not proposed.…”

Section: Introductionmentioning

confidence: 99%

FRP-RC Beam in Shear: Mechanical Model and Assessment Procedure for Pseudo-Ductile Behavior

Petrone

Monti

2014

Polymers

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This work deals with the development of a mechanics-based shear model for reinforced concrete (RC) elements strengthened in shear with fiber-reinforced polymer (FRP) and a design/assessment procedure capable of predicting the failure sequence of resisting elements: the yielding of existing transverse steel ties and the debonding of FRP sheets/strips, while checking the corresponding compressive stress in concrete. The research aims at the definition of an accurate capacity equation, consistent with the requirement of the pseudo-ductile shear behavior of structural elements, that is, transverse steel ties yield before FRP debonding and concrete crushing. For the purpose of validating the proposed model, an extended parametric study and a comparison against experimental results have been conducted: it is proven that the common accepted rule of assuming the shear capacity of RC members strengthened in shear with FRP as the sum of the maximum contribution of both FRP and stirrups can lead to an unsafe overestimation of the shear capacity. This issue has been pointed out by some authors, when comparing experimental shear capacity values with the theoretical ones, but without giving a convincing explanation of that. In this sense, the proposed model represents also a valid instrument to better understand the mechanical behavior of FRP-RC beams in shear and to calculate their actual shear capacity.

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“…It should be noted that the underestimation of flexural strength of beams and columns should be treated with caution because it will underestimate the shear demand of the members (Pam and Ho, 2001). Failure due to shear would be very brittle and should be avoided in design (Baczkowski and Kuang, 2008;Bukhari et al, 2010;Choi et al, 2010;Lu et al, 2009). A precise estimation of the beams' flexural strength would also allow engineers to predict the locations of plastic hinges (Bai and Au, 2008;Jaafar, 2008;Pam and Ho, 2009) and hence the deformability (Ho and Pam, 2010;Sebastian and Zhang, 2008;Wu et al, 2004) of members under extreme events.…”

Section: Introductionmentioning

confidence: 99%

Equivalent stress block for normal-strength concrete incorporating strain gradient effect

Peng

Pam

et al. 2012

Magazine of Concrete Research

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To account for the different behaviours of concrete under uniaxial compression and bending in the flexural strength design of reinforced concrete (RC) members, the stress-strain curve of concrete is normally scaled down so that the adopted maximum concrete stress in flexural members is less than the uniaxial strength. However, it was found from previous experimental research that the use of a smaller maximum concrete stress would underestimate the flexural strength of RC beams and columns. To investigate the effect of strain gradient on the maximum concrete stress developed in flexure, a total of 12 plain concrete and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads separately. The maximum concrete stress developed in the eccentric specimens was determined by modifying the concrete stress-strain curve obtained from the counterpart concentric specimens based on axial force and moment equilibriums. The test results revealed that the maximum concrete stress increases with strain gradient up to a certain maximum value. A formula was developed to correlate the maximum concrete stress to strain gradient. A pair of equivalent rectangular concrete stress block parameters that incorporate the effects of strain gradient was proposed for flexural strength design of RC members.

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Shear strengthening of reinforced concrete beams with CFRP

Cited by 101 publications

References 11 publications

Repair of reinforced concrete beams using carbon fiber reinforced polymer

Repair of reinforced concrete beams using carbon fiber reinforced polymer

FRP-RC Beam in Shear: Mechanical Model and Assessment Procedure for Pseudo-Ductile Behavior

Equivalent stress block for normal-strength concrete incorporating strain gradient effect

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