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Steel-fibre high-strength concrete prisms confined by rectangular ties under concentric compression

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Abstract

This paper presents results from a continuing research program that aims to investigate the behaviour of high-strength concrete columns and to recommend some design procedures to Brazilian Building Code. The specific current work deals with experimental behaviour of steel fibre high-strength concrete columns (SFHSCC) confined with low ratios of rectangular ties under concentric compression. Twenty-four small-scale SFHSCC were tested under concentric loading and their behaviour were examined and compared with the behaviour of two normal-strength concrete columns. The variables studied in this work were the concrete strength, amount of transversal reinforcement and volumetric fraction of steel fibre. The results indicated that steel fibre not only improves the columns ductility, but also avoids the premature concrete cover spalling. Further, to improve the ductility of high-strength concrete column, the used amount of steel reinforcement is the same when the confinement or steel fibre is applied.

Résumé

Cet article présente les résultats d'un programme de recherche continue qui a pour but d'étudier le comportement de poteaux en béton à hautes performances et de recommander quelques procédures de projet pour le Code Brésilien du béton armé. Ce travail traite du comportement expérimental de poteaux en béton fibré à hautes performances, confiné par des étriers rectangulaires, sous compression concentrique. Vingt-quatre poteaux de petite échelle ont été testés sous chargement concentrique et leur comportement a été examiné et comparé à ceux des poteaux en béton conventionnel. Les variables étudiées dans ce travail étaient la résistance du béton, la quantité d'armatures transversales et la fraction volumétrique de fibres d'acier. Les résultats ont indiqué que la fibre d'acier augmente non seulement la ductilité des poteaux, mais empêche l'enrobage prématuré de la couverture des armatures longitudinales. De plus, afin d'améliorer la ductilité de poteaux en béton à hautes performances, la quantité d'armatures en acier utilisée est la même que lorsque l'on utilise un confinement par des étriers rectangulaires ou des fibres d'acier.

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Authors and Affiliations

  1. Department of Civil Engineering, State University of Parana Weste, Rua Universitária, 2069, CEP 85814-110, Cascavel, PR, Brazil

    H. C. Lima Júnior

  2. Department of Structural Engineering, University of São Paulo, P.O. Box 359, CEP 13560-970, São Carlos, SP, Brazil

    J. S. Giongo

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  1. H. C. Lima Júnior
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  2. J. S. Giongo
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Lima Júnior, H.C., Giongo, J.S. Steel-fibre high-strength concrete prisms confined by rectangular ties under concentric compression. Mat. Struct. 37, 689–697 (2004). https://doi.org/10.1007/BF02480514

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  • DOI: https://doi.org/10.1007/BF02480514

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