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On the variability of the creep coefficient of structural concrete

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Abstract

Experimental data from many creep test series are compared with predictions from various formulas in international codes. A mathematical simple creep formula is proposed and its accuracy is determined from comparison with the experimental data. Based hereon, a probabilistic model for the creep coefficient is proposed and the different sources of uncertainty are quantified. The proposed model is well suited for hand calculations.

Résumé

On a comparé plusiurs formules proposées dans les codes nationaux et internationaux pour la prévision du coefficient de fluage. On a trouvé que certaines formules donnaient des erreurs systématiques. La formule proposée par le CEB et la FIP dans le Code Modèle de1978 semble la meilleure. On donne une version légèrement modifiée de cette formule sous une forme mathématique simple. On propose, en s'appuyant sur cette formule, un modèle probabiliste de détermination du coefficient de fluage. On donne ensuite des valeurs moyennes et des variances pour le béton quelconque et les variables du milieu. On étudie de façon détaillée l'influence des variations d'humidité de l'air sur le coefficient de fluage à l'aide d'un modèle de diffusion simple. On démontre enfin que le modèle est bien adapté pour les calculs manuels et on calcule la valeur moyenne et la variation du coefficient de fluage sur un cas particulier.

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Author notes

  1. H. O. Madsen (Visiting professor)

    Present address: Danish Engeneering Academy, Building 373, DK2800, Lyngby, Denmark

Authors and Affiliations

  1. Institut für Massivbau, Technical University of Munich, Munich, W. Germany

    D. Diamantidis Dipl.-Ing. (Research Assistant), H. O. Madsen (Visiting professor) & R. Rackwitz Dr.-Ing. (Research Associate)

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  1. D. Diamantidis Dipl.-Ing.
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  2. H. O. Madsen
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  3. R. Rackwitz Dr.-Ing.
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Diamantidis, D., Madsen, H.O. & Rackwitz, R. On the variability of the creep coefficient of structural concrete. Mat. Constr. 17, 321–328 (1984). https://doi.org/10.1007/BF02479090

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