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Pull-out behaviour of hooked steel fibres

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Abstract

A programme of research is described that has investigated the fracture of steel fibre reinforced sprayed concrete under flexural load, with the aim of developing a stress-profile model to predict flexural behaviour in the form of a load-deflection response. This paper reports the work associated with establishing the pull-out characteristics of hooked end fibres. The effects of matrix strength, fibre embedment length and orientation are described, together with the interaction of these parameters. The relationships established can be used to model the tensile response of a beam at varying crack width and hence form a key part of the stress-profile for predicting residual flexural strength, which is an essential requirement of a much needed design rationale for steel fibre concrete.

Résumé

Le programme de recherche décrit porte sur la rupture du béton projeté renforcé de fibres d'acier sous charge en flexion. Il a pour objectif de développer un modèle de profil de contrainte capable de prévoir le comportement en flexion sous la forme d'une réponse charge-déflexion. Cet article présente un travail lié à l'établissement des caractéristiques d'arrachement de fibres aux extrémités crochetées. Les effets de la résistance de la matrice, de la longueur d'enfoncement et l'orientation des fibres sont décrits, ainsi que l'interaction de ces paramètres. Les relations établies peuvent être utilisées pour modéliser la réponse en tension d'une poutre à une largeur de fissuration variable, et donc pour former la majeure partie du profil de contrainte visant à prévoir la résistance à la flexion résiduelle, qui est l'une des exigences essentielles d'une argumentation très attendue sur l'étude des bétons renforcés de fibres.

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  1. Department of Civil and Building Engineering, Loughborough University, LE11 3TU, Leics, UK

    P. Robins, S. Austin & P. Jones

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  1. P. Robins
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  2. S. Austin
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  3. P. Jones
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Robins, P., Austin, S. & Jones, P. Pull-out behaviour of hooked steel fibres. Mat. Struct. 35, 434–442 (2002). https://doi.org/10.1007/BF02483148

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