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Input of creep and shrinkage characteristics for a structural analysis program

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Abstract

Presented is a computer program for the input of creep and shrinkage properties for a structural analysis program. The program either accepts numerical data on the compliance function and the shrinkage function at discrete load durations and ages at loading, or uses the recent BP Model for creep involving the double-power law. The most useful characteristic is the availability of thirteen different options for specifying the creep and shrinkage parameters; sealed conditions or drying conditions, creep values specified and interpolation to be used, parameter of a creep formula specified, or creep formula automatically fitted to given creep data, short time data specified and extrapolation done by a formula, etc. In addition to returning the compliance function, the program also calculates the relaxation function and the age-dependent elastic moduli of a Maxwell chain model that is equivalent to the given creep properties. The program is particularly suitable for the input of creep characteristics for a large-scale finite element analysis.

Résumé

On présente l’informatisation des propriétés de fluage et de retrait qui entre dans un programme d’analyse structurale. Le programme soit accepte les données numériques de la fonction d’adaptation plastique et de la fonction de retrait pour des durées de chargement et des âges au chargement discrets, soit utilise le récent modèle de fluage BP à loi de double puissance. La caractéristique la plus utile est qu’on dispose de treize options différentes pour spécifier les paramètres de fluage et de retrait: conditions d’étanchéité ou conditions de séchage, valeurs spécifiées de fluage et interpolations, paramètres d’une formule spécifiée de fluage ou formules de fluage telles qu’elles donnent automatiquement les valeurs de fluage, valeurs spécifiées pour de courtes durées et extrapolations à partir d’une équation, etc. Outre qu’il restitue la fonction d’adaptation, le programme permet aussi de calculer la fonction de relaxation et les modules élastiques en relation avec l’âge d’un modèle HN de Maxwell, soit l’équivalent des propriétés de fluage données. Le programme se prête particulièrement à l’introduction des caractéristiques de fluage pour une analyse par éléments finis à grande échelle.

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References

  1. Bazant Z. P., Rossow E. C.—Finite element program for creep analysis of concrete structures, Transactions, 6th Int. Conf. on Structural Mech. in Reactor Technology, Paris, 1981, Paper H 3/4, North Holland, Amsterdam, 1981.

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Authors and Affiliations

  1. Center for Concrete and Geomaterials, Technological Institute, Northwestern University, 60201, Evanston, Illinois, USA

    Z. P. Bazant (Active Member, RILEM; Professor of Civil Engineering and Director)

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  1. Z. P. Bazant
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Bazant, Z.P. Input of creep and shrinkage characteristics for a structural analysis program. Mat. Constr. 15, 283–290 (1982). https://doi.org/10.1007/BF02479653

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  • DOI: https://doi.org/10.1007/BF02479653

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