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Casanova A.,CEA Saclay Nuclear Research Center | Casanova A.,Ecole Normale Superieure de Cachan | Jason L.,CEA Saclay Nuclear Research Center | Jason L.,Electricite de France | Davenne L.,IUT de Ville dAvray
Engineering Structures | Year: 2012

This paper presents a new finite element approach to model the steel-concrete bond effects. This model proposes to relate steel, represented by truss elements, with the surrounding concrete in the case where the two meshes are not necessary coincident. The theoretical formulation is described and the model is applied on a reinforced concrete tie. A characteristic stress distribution is observed, related to the transfer of bond forces from steel to concrete. The results of this simulation are compared with a computation in which a perfect relation between steel and concrete is supposed. It clearly shows how the introduction of the bond model can improve the description of the cracking process (finite number of cracks). © 2012 Elsevier Ltd. Source


Torre-Casanova A.,CEA Saclay Nuclear Research Center | Torre-Casanova A.,Ecole Normale Superieure de Cachan | Jason L.,CEA Saclay Nuclear Research Center | Jason L.,Electricite de France | And 2 more authors.
Engineering Fracture Mechanics | Year: 2012

In this contribution, an experimental campaign based on unconfined and actively confined pull-out tests is presented to investigate the bond stress-slip behavior. This campaign aims at underlining passive (concrete cover) and active (external pressure) confinement effects on the maximal bond stress. Experimental results are associated to a numerical approach in order to predict the evolution of the bond strength. Equations are finally proposed that distinguish splitting failure (function of the concrete tensile properties) and pull-out failure (function of the compressive concrete properties). © 2012 Elsevier Ltd. Source


Jason L.,CEA Saclay Nuclear Research Center | Jason L.,Electricite de France | Torre-Casanova A.,CEA Saclay Nuclear Research Center | Torre-Casanova A.,Ecole Normale Superieure de Cachan | And 2 more authors.
International Journal of Fracture | Year: 2013

Experimental and numerical results are provided in this contribution to study the global and cracking behaviors of two reinforced concrete beams subjected to four point bending. Experimentally, the use of image correlation technique enables to obtain precise information concerning the cracking properties (spacing, cumulated, maximum and mean values of the opening). Numerically, two simulations are compared taking into account a bond model between steel and concrete or supposing a perfect relation between the two materials. In both cases, a good agreement is achieved between numerical and experimental results even if the introduction of the bond effects has a direct influence during the development of the cracks (better agreement during the "active" cracking phase). © 2013 Springer Science+Business Media Dordrecht. Source

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