Identification du comportement à rupture d'éléments de structures en béton armé corrodées

ABSTRACT This paper deals with the influence of corrosion on the mechanical behaviour of reinforced concrete structures combining experimental investigations and numerical computations. Constitutive equations for corroded steel bars have been developed and implemented within a multifiber finite element. It allows accounting for the decrease of ductility due to pitting corrosion. The mechanical effects of rust on the bond-slip behaviour of concrete-steel interface have been identified thanks to a new experimental set-up. Steel-concrete bond rupture models may be identified sustaining coupled mechanical-chemical multiaxial loadings. Experiments on reinforced concrete four points bend tests have been carried out, subjected to accelerated different levels of corrosion.