Influence of geometric, strain and size effects on bond in structural concrete
Design formulations for calculation of bond strength in structural concrete members usually include a number of parameters such as the stress acting in the reinforcement, the concrete cover and the diameter of the reinforcing bars. These parameters are actually necessary to account for geometric, strain and size effect that govern many bond issues and that have been experimentally verified. Unfortunately, most design approaches are still based on empirical formulas that do not lead to a clear understanding why the different phenomena have to be taken into account. In this paper, a mechanical explanation of such effects is presented with reference to the various potential bond failure modes. Analogies to other related problems (such as spalling of concrete cover in arch-shaped members) are finally discussed.
Keywords: acier ; adhérence acier-béton ; barre nervurée ; béton ; béton tendu ; code modèle CEB/fip ; comportement statique ; résultat d’essais ; steel ; steel-concrete bond ; deformed reinforcement bar ; concrete ; concrete in tension ; CEB/FIP model code ; structural behaviour ; test result
Record created on 2012-10-15, modified on 2016-08-09