Predictions of the maximum plate end stresses of FRP strengthened beams: Part II

Quantrill, R. J.; Hollaway, L.; Thorne, A.M.

doi:10.1680/macr.1996.48.177.343

Cited by 79 publications

(15 citation statements)

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“…Properties of adhesives and FRP laminates used in the analysis are as given in the referenced works [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The Young's modulus of the adhesive Ea can range from 2 to 12 Finite element models of FRP-plated beams, with refined mesh in the plate-end region, in general indicate a variation in both normal and shear stresses across the thickness of the adhesive layer.…”

Section: Linear Elastic Analysismentioning

confidence: 99%

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Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure

Pešić

Pilakoutas

2003

Composites Part B: Engineering

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This paper studies the problem of early concrete cover delamination and plate-end failure of reinforced concrete beams strengthened with externally bonded FRP-reinforcement. The accuracy of analytical models and finite element (FE) methods for predicting this type of failure is assessed against published experimental data. Two design approaches based on the maximum concrete tensile strength and the shear capacity of concrete beams were examined first and it was found that linear elastic analysis can not accurately predict the brittle plate-end. It was also found that the extent of strengthening that can be achieved is limited by the shear capacity of concrete beams. The FE analysis is used to examine the effects of internal tensile reinforcement on the magnitude principal tensile stresses in the critical region. The non-linear behaviour of FRP-strengthened beams is also examined in the FE analysis using the smeared crack model for concrete which is shown to adequately display the inelastic deformation of the beam. Finally, the mixed mode of failure due to the combined shear and concrete cover delamination is addressed through modelling plate-end and shear crack discontinuities using the discrete crack approach.

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Section: Linear Elastic Analysismentioning

confidence: 99%

“…This can lead to a type of failure reported in the past which typically results in the separation of the FRP-plate and adjacent thin concrete layer from the beam [20,22,23,29].…”

Section: Constitutive Materials Models For Non-linear Fe Analysismentioning

confidence: 99%

Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure

Pešić

Pilakoutas

2003

Composites Part B: Engineering

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“…These two modes alter the more classical sectional flexural modes of FRP rupture and concrete crushing. While developing methods to predict cover delamination, several investigators formulated empirical and analytical expressions for that purpose [1][2][3][4][5][6][7]. Some of these procedures yielded inconsistent results [5].…”

Section: Introductionmentioning

confidence: 99%

The Influence of CFRP Anchorage on Achieving Sectional Flexural Capacity of Strengthened Concrete Beams

Rasheed

Decker²,

Esmaeily

et al. 2015

Fibers

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This research program is intended to verify the influence of using distributed external U-wrap CFRP anchorage to shift the failure mode from overall debonding to sectional flexural failure for concrete beams externally bonded with CFRP sheets. Premature cover delamination and FRP debonding are predominant failure modes in FRP flexural strengthening that may be delayed or prevented by using FRP anchorage. The present experimental study aims to comparatively prove that proper anchorage of flexural strengthening is anticipated to yield a classical flexural failure by FRP rupture or concrete crushing. Once the cohesion of concrete and/or the adhesion with the FRP is exhausted, the U-wraps are engaged to provide anchorage to the flexural FRP through shear friction. Accordingly, three identical T beams and three identical rectangular beams were designed and constructed to examine the capacity improvement by preventing premature debonding failure. The first specimen in each series was tested as a control beam. The second specimen in each series was strengthened using five layers of flexural CFRP in order to admit a debonding failure. The third specimen in each series was strengthened with the same five layers of flexural CFRP plus additional transverse CFRP U-wraps. This study proved that it is possible to quantify the higher flexural capacity of CFRP strengthened beams using external anchorage. OPEN ACCESSFibers 2015, 3 540

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“…Consequently, many studies have been carried out in order to understand the failure mechanism of plated or connected beams [1][2][3][4][5][6][7][8][9][10][11][12][13][14] or laminated glass [15]. These studies converge to an important aspect: the presence of shear and normal stresses at the plate-core interface.…”

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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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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Predictions of the maximum plate end stresses of FRP strengthened beams: Part II

Cited by 79 publications

References 0 publications

Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure

Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure

The Influence of CFRP Anchorage on Achieving Sectional Flexural Capacity of Strengthened Concrete Beams

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

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