Matériaux et Construction

, 12:431 | Cite as

Fracture processes of concrete under generalised stress states

  • M. D. Kotsovos
Article

Abstract

Based on previous investigations of the behaviour of concrete under multiaxial stress, it is found that the fracture processes of concrete can be categorised into (a) those which are caused by the deviatoric component of a stress state and occur in the direction of the “applied” maximum principal compressive stress, and (b) those which are caused by the hydrostatic component and are of “random” orientation.

The above procedures occur in the form of crack extension and stable crack propagation processes which, when caused by the deviatoric component, eventually become unstable and lead to ultimate collapse, whereas when caused by the hydrostatic component, progressively diminish and have a delaying effect on any subsequent cracking process.

Keywords

Fracture Process Deviatoric Stress Crack Extension Stress Path Hydrostatic Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

D'après des études antérieures du comportement du béton sous contraintes pluriaxiales, il se révèle que les processus de rupture qui interviennent sous contrainte croissante peuvent se classer en (a) ceux causés par la composante de distorsion d'un état de cisaillement et qui se produisent dans la direction de la plus grande contrainte de compression principale «appliquée», et, (b) ceux qui sont déterminés par la composante hydrostatique d'un état de contrainte et selon des directions quelconques, étant compris que la cause en est les états de contrainte locaux avec aucune direction principale définie.

Le mécanisme de la rupture déterminé par la composante de distorsion est celui d'un développement de fissures dû à l'apparition de ramifications suivie par une propagation régulière de ces fissures ramifiées qui peuvent devenir «catastrophiques» et déterminer und effondrement. Les neveaux de contrainte et de déformation qui correspondent au début du processus de propagation des fissures régulières et catastrophiques ont été proposés comme les bases pour les critères de rupture aux limites inférieures et supérieures qui conviennent au calcul des structures.

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Copyright information

© Bordas-Dunod 1979

Authors and Affiliations

  • M. D. Kotsovos
    • 1
  1. 1.Concrete Materials Research GroupImperial CollegeLondon

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