Abstract
A uniaxial cyclic model for confined and unconfined concrete is developed. Starting from an existing model, the cyclic rules to define inelastic strain and degradation of strength and stiffness are first reviewed and then modified to produce a new concrete model with enhanced performance. Comparisons at the stress-strain level between the new and existing concrete models reveal the adequacy of the new model in terms of numerical stability and increasing degradation of strength and stiffness under increasing cyclic strain. The proposed model is validated by comparing analytical predictions with experimental results of reinforced concrete members under cyclic and dynamic loading. Good agreement is observed between analysis and experiments, confirming the ability of the model to predict the cyclic and dynamic behavior of reinforced concrete members with mixed axial-flexural response characteristics.
Résumé
Un modèle cyclique uniaxial pour le béton confiné et non confiné est développé. Sur la base d'un modèle existant, les règles cycliques qui définissent la déformation inélastique et la dégradation de la rigidité et de la résistance sont analysées et ensuite modifiées afin de produire un nouveau modèle plus performant. Des comparaisons entre le nouveau modèle et des modèles existants au niveau de la contrainte-déformation montrent l'adéquation du nouveau modèle en ce qui concerne la stabilité numérique et l'évolution de la dégradation de la rigidité et de la résistance sous déformation cyclique. Le modèle proposé est validé par comparaison des prévision analytiques avec des résultats expérimentaux sur des éléments de béton armé soumis à des charges cycliques et dynamiques. Une bonne concordance est observée entre l'analyse et les expériences, confirmant ainsi la capacité du modèle à prédire le comportement cyclique et dynamique des éléments en béton armé soumis à l'action combinée des efforts axiaux et de flexion.
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Martínez-Rueda, J.E., Elnashai, A.S. Confined concrete model under cyclic load. Mat. Struct. 30, 139–147 (1997). https://doi.org/10.1007/BF02486385
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DOI: https://doi.org/10.1007/BF02486385