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Communication Dans Un Congrès Année : 2013

Numerical modelling of large reinforced concrete specimens based on experimental tests from benchmark Concrack

Résumé

Most infrastructures are reinforced concrete (RC) structures. And these structures have to be kept operational. For that the stackholders have to watch and observe the noticeable signs of degradation resulting from interactions between the environment and their constitutive materials. Of course, these interactions can reveal cracks which are the major worry with respect to durability and sustainability. If no maintenance or repair actions occur this durability could decrease until the serviceability becomes affected and in some cases, until the structural safety is concerned. In this framework, the French national research programme CEOS.fr (Behaviour and assessment of special construction works concerning cracking and shrinkage) has been elaborated. Its aim is to show the behaviour evolution of special concrete structures particularly their cracking states (opening and space of cracks) and develop tools allowing the structural behaviour prediction (forecast). Associated with the project CEOS.fr, an international benchmark named Concrack (Control of cracking in RC structures) dealt with the modelling of the experimental behaviour of large specimens. In that context, the authors are focused on the modelling of one tested mock-up. It is a large reinforced concrete beam named RL1 subjected to a free shrinkage test followed to a bending test. The authors are concentrated on the mechanical part. In order to model the mechanical test, a 2D plane stress model for the bending beam is performed. In this case, both concrete models are used, Mazars one [Mazars, 1984] and Ricrag [Richard et al., 2010]. The steel model is a classical hardening elastoplastic law. The Ricrag model is a law based on the thermodynamics of irreversible processes coupling elasticity, isotropic damage and internal sliding. Thus, this model could show its capacities to predict the behaviour of the structure according to the experimental results. In this study, the authors show the effect of the boundary conditions on the numerical results and his importance to get a good accordance with the experimental results. Crack openings and spaces are obtained by post processing and compared with the experimental results and the global numerical results are also compared to the experimental ones. At last, the set of the results is encouraging.
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Dates et versions

hal-01066763 , version 1 (22-09-2014)

Identifiants

  • HAL Id : hal-01066763 , version 1

Citer

Lucas Adelaide, Claude Rospars, Gianluca Ruocci. Numerical modelling of large reinforced concrete specimens based on experimental tests from benchmark Concrack. FRAMCOS-8 - International Conference on Fracture Mechanics of Concrete and Concrete Structures, Mar 2013, Spain. 11p. ⟨hal-01066763⟩
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