Interfacial stresses in FRP-plated RC beams: Effect of adherend shear deformations

Tounsi, Abdelouahed; Daouadji, Tahar Hassaine; Benyoucef, Samir; Bedia, E.A. Adda

doi:10.1016/j.ijadhadh.2008.06.008

Cited by 78 publications

(63 citation statements)

References 19 publications

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“…16 ] s reduces considerably the debonding stresses. This last observation, without taking into account the fibers orientations in the composite plate, is in agreement with conclusions of Zhang and Teng [25]. It can also be seen that FE results at mid-plane of the adhesive layer match quite well with previous closed-form solutions.…”

Section: Assumptions Of the Modelingsupporting

confidence: 91%

“…In fact, these stresses can produce the brittle fracture of the concrete layer, which supports the composite laminate, followed by the premature failure of the strengthened beam. Many closedform solutions have been developed by researchers for the interfacial stresses [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Smith and Teng's solution [21] gives an accurate estimation of interfacial stresses but does not take into account the FRP plate fiber orientation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical–numerical investigation

Krour

Bernard

Tounsi

2013

Engineering Structures

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Important failure mode of such plated beams is the debonding of the FRP plates from the concrete due to high level of stress concentration in the adhesive at the ends of the FRP plate. This paper presents a new method for reducing interfacial stresses in a concrete beam bonded with the FRP plate by including the effect of the fiber orientation in the FRP plate. This work is divided into two parts; the first one is based on the laminates theory for the analytical solution where a minimization method is used to directly determine the fiber orientation reducing the interfacial stresses. The second part consists into a Finite Element modeling where the analytical solution and different fibers orientation combinations are tested for improving strengthening quality. Numerical results from the present analysis are presented in order to show the advantages of the present solution over existing ones and to reconcile debonding stresses with strengthening quality.

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Section: Assumptions Of the Modelingsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical–numerical investigation

Krour

Bernard

Tounsi

2013

Engineering Structures

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“…The characteristic common to most analytical solutions is the assumption that materials exhibit linear elastic behavior. Recent studies in this regard have been authored by Tounsi and Benyoucef (2007), Yang et al (2007), and Tounsi et al (2009). Another assumption shared by these solutions is that stress is constant across the adhesive.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adhesive Thickness and Concrete Strength on FRP-Concrete Bonds

2012

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Abstract:The use of fiber-reinforced polymer (FRP) composites for strengthening, repairing, or rehabilitating concrete structures has become more and more popular in the last 10 years. Irrespective of the type of strengthening used, design is conditioned, among others, by concrete-composite bond failure, normally attributed to stress at the interface between these two materials. Single shear, double shear, and notched beam tests are the bond tests most commonly used by the scientific community to estimate bond strength, effective length, and the bond stress-slip relationship. The present paper discusses the effect of concrete strength and adhesive thickness on the results of beam tests, which reproduce debonding conditions around bending cracks much more accurately. The bond stress-slip relationship was analyzed in a cross section near the inner edge, where stress was observed to concentrate. The ultimate load and the bond stress-slip relationship were visibly affected by concrete strength. Adhesive thickness, in turn, was found to have no significant impact on low-strength concrete but a somewhat greater effect on higher strength materials.

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“…E f,S /E f,P =1.35), this result seems to confirm that the reinforcement thickness particularly affects debonding behaviour. Indeed, the greater the thickness, the higher the increase in the normal and shear stresses at FRP to concrete interface and consequently the probability of premature debonding occurrence (Oehlers and Moran, 1990;Tounsi et al, 2009). The interface shear stresses τ i (z) were obtained by the variation of axial stress and, hence, strain throughout the FRP by the following relationship between two strain gauges at distance Δz i,i+1…”

Section: Resultsmentioning

confidence: 99%

On the Behavior of FRP-to-concrete Adhesive Interface: Theoretical Models and Experimental Results

Martinelli¹,

Bilotta²,

Faella³

et al. 2011

Advances in Composite Materials - Ecodesign and Analysis

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Interfacial stresses in FRP-plated RC beams: Effect of adherend shear deformations

Cited by 78 publications

References 19 publications

Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical–numerical investigation

Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical–numerical investigation

Effect of Adhesive Thickness and Concrete Strength on FRP-Concrete Bonds

On the Behavior of FRP-to-concrete Adhesive Interface: Theoretical Models and Experimental Results

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