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Experimental study of the behaviour of reinforced high-strength concrete short corbels

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Abstract

Within the framework of the French National Project BHP 2000 (the BHP 2000 project is detailed in Toutlemondeet al. [1]), seven high-strength reinforced concrete short corbels were tested using concrete from 70 MPa to 120 MPa. The behaviour of a test specimen is characterised by the crack pattern and by LVDT and gauges measurements. The results show the influence of the concrete strength and that of the reinforcement quantity (Bourget and Delmas [2]). The failure conventional shear stresses computations with the relations proposed by B. Fouré [3] show that these relations are adapted to the strength evaluation of the short corbels with a safety coefficient.

Résumé

Dans le cadre du Projet National français BHP 2000 (le projet BHP 2000 est détaillé dans Toutlemondeet al. [1]), sept consoles courtes en béton armé réalisées en bétons hautes performances de 70 à 120 MPa ont été testées. Le comportement d’un corps d’épreuve est caractérisé par le relevé de fissuration et par des mesures effectuées avec des jauges de déformation et un capteur LVDT. Les résultats montrent l’influence de la résistance du béton et du ferraillage (Bourget et Delmas [2]). Les valeurs à la rupture de la contrainte conventionnelle de cisaillement calculée en utilisant les relations proposées par B. Fouré [3] montrent que ces relations sont adaptées à l’évaluation de la résistance des consoles avec un coefficient de sécurité.

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Abbreviations

d:

effective depth: vertical distance from the main reinforcement center to the intersection of the column and the sloping face of the corbel

a:

shear span: distance between vertical load and corbel-column interface

δ:

a/d

b:

test specimen thickness (15 cm)

lw :

effective width of the bearing plate

2F:

vertical load applied on the column of test specimen

Fuexp :

ultimate load of the short corbel

τ=F/bd:

conventional shear stress

τu th :

ultimate theoretical conventional shear stress

τu exp :

ultimate experimental conventional shear stress

ρs :

A/bd where As is the main reinforcement area

ρr :

A/bd where Ar is the secondary reinforcement area

γs :

safety coefficient on steel yielding

fes :

yield stress of the main reinforcement

fer :

yield stress of the secondary reinforcement

fc :

compressive strength of concrete

Rt:

tensile splitting strength of concrete

E:

Young’s modulus of concrete

ν:

Poisson’s ratio of concrete

References

  1. Toutlemonde, F., Brazillier, D. and de Larrard, F., ‘Recent advances in France in High Performance Concrete technology’ Proceedings of SEWC’98, San Francisco, July 98, “T185-3”, (Structural Engineering World Wide, Elsevier Sciences, 1998).

  2. Fouré, B., ‘Justifications sous sollicitations tangentes’,Bulletin des Laboratoires des Ponts et Chaussées spécial XIX (1996) 43–52.

  3. Bourget, M. et Delmas, Y., ‘Dimensionnement des consoles courtes en BTHP’, Rapport d’étude du PN BHP 2000 (1998).

  4. BAEL 91 annexe E.6 Consoles courtes.

  5. ‘Extension du domaine d’application des règlements de calcul BAEL/BPEL aux bétons à 80 MPa’,Bulletin des Laboratoires des Ponts et Chaussées spécial XIX (1996).

  6. de Larrard, F. et Baroghel-Bouny, V., ‘Vieillissement des bétons en milieu naturel: une expérimentation pour le XXIe siècle. I: Généralités et caractéristiques mécaniques des bétons’,Bulletin des Laboratoires des Ponts et Chaussées 225 (2000).

  7. Khadraoui, A., ‘Analyse et comportement mécanique des consoles courtes en béton armé’, Thèse de l’Université de Reims Champagne-Ardenne, (1998).

  8. Kriz, L. B. and Raths, C. H., ‘Connections in precast concrete structures: Structures-strength of corbels’,PCI Journal 10 (1965) 16–60.

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  9. Foster, S. and Gilbert, R., ‘The design of nonflexural members with normal and high-strength concretes’,ACI Structural Journal (January–February 1996) 3–10.

  10. Foster, S., Powel, R. and Selim, H., ‘Performance of high-strength concrete corbels’,ACI Structural Journal (September–October 1996) 555–563.

  11. Robinson, J. R., ‘Élements constructifs spéciaux du béton armé’ (Éditions EYROLLES, 1975).

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Author information

Authors and Affiliations

  1. Groupe Mécanique, Matériaux, Structures, Université de Reims Champagne-Ardenne, rue des Crayères, BP 1037, 51687, Reims Cedex 2, France

    M. Bourget & Y. Delmas

  2. Laboratoire Central des Ponts et Chaussées, Structures Department, 58 bd Lefebvre, Paris Cedex 15, France

    F. Toutlememonde

Authors
  1. M. Bourget
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  2. Y. Delmas
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  3. F. Toutlememonde
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Editorial Note The LCPC is a RILEM Titular Member.

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Bourget, M., Delmas, Y. & Toutlememonde, F. Experimental study of the behaviour of reinforced high-strength concrete short corbels. Mat. Struct. 34, 155–162 (2001). https://doi.org/10.1007/BF02480506

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  • DOI: https://doi.org/10.1007/BF02480506

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