Abstract
A numerical formulation to analyse thermohygrometrically and mechanically coupled fields in concrete is presented. One of the main applications concerns the creep and shrinkage of concrete, wherein the transient hygrothermal effects are related to the mechanical behaviour and take account of geometrical non-linearities and anisotropic damage coupled with viscosity. The stress-strain relationship is represented by an integral equation. This procedure is implemented in a finite element code in order to analyse 2-D and 3-D structures of any shape, and the results regarding the numerical simulation of the creep and shrinkage in a concrete cylinder are presented.
Résumé
On présente ici une formulation numérique permettant, pour le béton, l'analyse des couplages de champs thermohygrométriques et mécaniques associés. Les applications principales concernent le fluage et le retrait, où les effets hygrothermiques transitoires sont reliés au comportement mécanique du fait des non linéarités géométriques et de l'endommagement anistrope associés à la viscosité. La loi contrainte-déformation se présente sous la forme d'une équation intégrale et la procédure est implémentée dans un code éléments finis permettant l'analyse des structures à deux ou trois dimensions. Des résultats relatifs à la simulation numérique du fluage et du retrait sur un cylindre de béton sont donnés afin de montrer l'intérêt de l'approche.
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Editorial note Dr. Carmelo Majorana is a RILEM Senior Member. He is a corresponding member of TC 114-CCS on Computer programmes for Creep and Shrinkage analysis of concrete structures. Prof. Jacky Mazars works at the Laboratoire de Mécanique et Technologie, ENS, France, which is a RILEM Associate Member. He is a member of TC 147-FMB on Fracture Mechanics applications to anchorage and Bond and the Editorial Group of 090-FMA on Fracture Mechanics of concrete-Applications.
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Majorana, C., Mazars, J. Thermohygrometric and mechanical behaviour of concrete using damage models. Mat. Struct. 30, 349–354 (1997). https://doi.org/10.1007/BF02480685
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DOI: https://doi.org/10.1007/BF02480685