Modeling the nonlinear mechanical response of reinforced concrete structures by simplified approaches

Abstract : This work aims to develop and identify a new model for reinforced concrete joint element subject to cyclic loadings. Based on experiments and 3D numerical modeling, a simplified model of RC beam-column joint is introduced (within the framework of macro-element). In a first experimental study, this joint will be tested under reverse cyclic loading applied at the beam tip to identify its behavior under this kind of loading in terms of strength, stiffness and ductility. In parallel of experiments, a finite elements model of the joint based on 3D finite elements is presented to highlight and define the nonlinear mechanisms involved in the ruin of the assembly. This step will confirm the experimentally observed phenomena: damage, friction, plasticity. Secondly, a simplified macro-element model for beam-column joint, associated to a nonlinear behavior, is introduced to reflect the response of the joint under cyclic loading loads. Model parameters will be identified from experimental results and analysis on a local scale via 3D finite element calculation. Finally, numerical analyses will be performed to validate the proposed approach in comparison with the experimental tests.
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Alaa Eddin Iskef, Fabrice Gatuingt, Frédéric Ragueneau, Cédric Giry. Modeling the nonlinear mechanical response of reinforced concrete structures by simplified approaches. Third International Conference on Geotechnics, Buildings and Structures (CIGOS 2015 ), May 2015, Paris, France. ⟨hal-01623728⟩

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