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Strength of short concrete columns confined with CFRP sheets

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Abstract

The confinement of concrete columns provided by carbon fibre reinforced plastic (CFRP) sheets can be an efficient technique for their structural strengthening. The principal advantages of this technique are the high strength-to-weight ratio, good fatigue properties, non-corroding characteristics of the CFRP, and the facility of its application.

An experimental research program, that included tests on 54 short column specimens, was carried out to investigate the gain in strength and ductility of concrete columns externally confined by CFRP wrapping. The variables studied were the column cross section shape (circular, square and rectangular) and the amount of confinement expressed in the number of CFRP sheet layers applied to the models (one or two layers).

On the basis of the obtained results, equations were proposed to calculate the confined concrete strength and the ultimate confined concrete strain as a function of the confining lateral stress for each of the cross section geometry used, circular, square and rectangular. The estimations given by these equations and by those from formulas encountered in the literature were compared with the experimental ones and general conclusions were, finally, drawn.

Résumé

Le confinement de colonnes de béton assuré par des feuilles de plastique renforcé par des fibres de carbone (CFRP) peut être une technique efficace pour leur comportement structural. Les principaux avantages de cette technique sont la haute relation résistance-poids, des bonnes propriétés de fatigue, les caractéristiques non-corrosives du CFRP, et la facilité de leur application.

Un programme expérimental comprenant des essais sur 54 colonnes courtes fut entrepris en vue de déterminer le gain de résistance et de ductilité de colonnes en béton confinées sur le plan externe en les recouvrant de feuilles de CFRP. Les variables étudiées étaient la forme de la section transversale (circulaire, carrée et rectangulaire), et la quantité de renforcement, mesurée par le nombre de feuilles de CFRP appliquées aux modèles (une ou deux couches).

En prenant comme base les résultats obtenus, des équations ont été proposées pour calculer la résistance du béton confiné et sa déformation spécifique ultime en fonction de la contrainte latérale de confinement, pour chaque forme de section transversale utilisée, circulaire, carrée et rectangulaire. Les estimations données par ces équations et celles données par des formules trouvées dans la litérature ont été comparées avec les résultats expérimentaux et des conclusions générales ont finalement été établies.

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Authors and Affiliations

  1. COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

    I. A. E. M. Shehata & L. C. D. Shehata

  2. Instituto Militar de Engenharia, Rio de Janeiro, Brazil

    L. A. V. Carneiro

  3. Universidade Federal Fluminense, Rio de Janeiro, Brazil

    L. C. D. Shehata

Authors
  1. I. A. E. M. Shehata
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  2. L. A. V. Carneiro
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  3. L. C. D. Shehata
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Shehata, I.A.E.M., Carneiro, L.A.V. & Shehata, L.C.D. Strength of short concrete columns confined with CFRP sheets. Mat. Struct. 35, 50–58 (2002). https://doi.org/10.1007/BF02482090

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  • DOI: https://doi.org/10.1007/BF02482090

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