Strengthening of concrete columns with carbon fibre reinforced polymer wrap

Shrive, Penelope L.; Azarnejad, Azita; Tadros, Gamil; McWhinnie, C; Shrive, Nigel G.

doi:10.1139/l03-007

Cited by 21 publications

(13 citation statements)

References 10 publications

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“…A similar relationship is derived in Shrive et al (2003). For a given thickness of the wrap, the ultimate confining pressure reduces as the column diameter is increased.…”

Section: Expected Influence Of Column Sizesupporting

confidence: 56%

Carbon fibre reinforced polymer wrapping for the rehabilitation of masonry columns

Masia¹,

Shrive²

2003

Can. J. Civ. Eng.

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The use of carbon fibre reinforced polymer (CFRP) wrapping to strengthen existing cracked masonry columns was investigated experimentally. The study was aimed at quantifying the increase in strength that can be achieved and assessing the effect of column size on the strength increase. Eighteen columns were tested, with three different square cross-sectional sizes (290 mm × 290 mm, 390 mm × 390 mm, 490 mm × 490 mm) and two different types of clay masonry unit. Six columns were constructed in each size, two columns using unit type 1 and four columns using unit type 2. Strengthening was achieved by wrapping the square section columns directly with a single-layer CFRP laminate or by wrapping the columns after first casting a circular concrete jacket around the column. The latter treatment was applied to two of the small-sized columns and two of the intermediate-sized columns. All other square section columns were wrapped directly. Significant strength increases were achieved, particularly when the columns were provided with the cylindrical concrete jacket. These preliminary tests indicate that the use of CFRP wrapping is an effective technique for rehabilitating damaged masonry columns. Decisive conclusions could not be made regarding the effect of column size (cross-sectional area) on the strength increase achieved. Further tests together with nonlinear finite element modelling aimed at duplicating the experimental observations would greatly enhance the information provided by the current tests.Résumé : L'utilisation de couches de polymères renforcés par fibres de carbone (« carbon fibre reinforced polymer : CFRP ») pour consolider des colonnes de maçonnerie fissurées a été étudiée au moyen d'expériences. Le but était de quantifier l'augmentation de résistance qui pouvait être atteinte et d'évaluer l'effet de la dimension des colonnes sur l'augmentation de la résistance. Dix-huit colonnes carrées (290 mm × 290 mm, 390 mm × 390 mm, 490 mm × 490 mm) ont été mises à l'épreuve; elles étaient composées d'éléments de deux types différents d'argile de maçon-nerie. Six colonnes de chaque dimension ont été construites, deux colonnes utilisant l'élément de type 1 et quatre l'élément de type 2. Le renforcement a été réalisé en enroulant les colonnes de section carrée d'une seule couche de laminé CFRP, ou en enrobant les colonnes après avoir préalablement coulé une gaine de béton circulaire autour de la colonne. Ce dernier traitement a été appliqué à deux colonnes de petites dimensions et à deux colonnes intermédiaires. Toutes les autres colonnes carrées ont été enrobées directement. Des augmentations importantes de résistance ont été atteintes, surtout avec la gaine de la gaine de béton circulaire. Ces essais préliminaires indiquent que l'utilisation d'une couche de CFRP représente une technique efficace pour restaurer les colonnes en maçonnerie endommagées. Des conclusions probantes n'ont pu être atteintes quant à l'effet de la dimension des colonnes (superficie de la section transversale) sur l'augmentation de la résistance ...

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“…A similar relationship is derived in Shrive et al (2003). For a given thickness of the wrap, the ultimate confining pressure reduces as the column diameter is increased.…”

Section: Expected Influence Of Column Sizesupporting

confidence: 56%

Carbon fibre reinforced polymer wrapping for the rehabilitation of masonry columns

Masia¹,

Shrive²

2003

Can. J. Civ. Eng.

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“…The tie spacing is 100mm and the S8 represents diameter of stirrups. For measurement of axial strains, four linear variable displacement transducers (LVDTs) are placed over the central 400mm gage length at each side of a column in a similar way used to assess any eccentricity of the applied load as recommended in the study of Shrive et al [10]. Although the LVDT readings were provided very close to each other, next to the maximum axial load there can be a significant variation between the minimum and maximum values of shortening reaching very high values [9].…”

Section: Experimental Studymentioning

confidence: 99%

Modeling aspects concerning the axial behavior of RC columns

Koksal¹,

Turgay²,

Karakoç³

et al. 2011

Materials Characterisation V

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This paper is concerned with the axial behavior of the RC columns. Stress-strain relationships of experimentally tested RC columns under concentric loading are compared with the predictions of the Koksal model. Moment-curvature analyses of RC sections are also performed employing the same model in a self-developed moment-curvature program for confined concrete. Results are compared with the output of EXTRACT which uses the Mander concrete model.

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“…For measurement of axial strains, four linear variable displacement transducers (LVDTs) are placed over the central 400mm gage length at each side of a column in a similar way used to assess any eccentricity of the applied load as recommended in the study of Shrive et al [9]. A pre-loading up to the onefourth of the predicted axial capacity is applied to maintain similar displacement readings at LVDTs so that in the linear elastic stage of the overall behavior any eccentricity can be eliminated.…”

Section: Experimental Workmentioning

confidence: 99%

Evaluation of experimental procedures for confined concrete columns using 3D finite element analyses

Koksal¹,

Karakoç²,

Polat³

et al. 2007

WIT Transactions on Modelling and Simulation, Vol 46

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This paper presents the results of the early stages of both a continuing experimental work on the square confined concrete columns and their 3D finite element modeling based on the isotropic damage theory in order to establish a realistic approach for the confinement pressure. Based on the axial behavior of four RC columns with a 200 mm square cross section tested under concentric loading, existing experimental data and procedures in the literature are evaluated. As demonstrated from the comparison of the FE analysis and the test results, obtaining a uniform axial loading and deformation state is questionable.

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Strengthening of concrete columns with carbon fibre reinforced polymer wrap

Cited by 21 publications

References 10 publications

Carbon fibre reinforced polymer wrapping for the rehabilitation of masonry columns

Carbon fibre reinforced polymer wrapping for the rehabilitation of masonry columns

Modeling aspects concerning the axial behavior of RC columns

Evaluation of experimental procedures for confined concrete columns using 3D finite element analyses

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