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Contribution à l'analyse expérimentale du comportement mécanique cyclique du béton
Résumé La prévision de la réponse d'un élément en béton armé soumis à des sollicitations normales cycliques nécessite la connaissance des lois de comportement du matériau, notamment du béton. On montre qu'avec une cellule spécifique peu onéreuse, placée sous une presse conventionnelle, on peut obtenir des résultats expérimentaux sur cylindres normalisés en compression, en traction et sous cycles combinés. Soixante dix-huit résultats sont analysés et permettent de définir un modèle dépendant uniquement de la résistance caractéristique du béton. Ce modèle offre l'avantage d'avoir une formulation analytique simple, similaire en compression et en traction et d'être réaliste dans la représentation des boucles d'hystérésis en compression.
Summary In order to predict the mechanical response of a reinforced concrete frame submitted to normal cyclic loadings, it is necessary to take into account constitutive laws translating accurately the non-linear compressive and tensile properties and the hysteretic loops during cycles, especially in the case of concrete. After designing a specific and economic cell called ‘CT’ (compression tension), it is possible to test normalized concrete cylinders (16×32 cm) under combined compression and tension loadings using a conventional testing machine. Continuous curves with descending branch and cycles are obtained. The fundamental idea is that the cell is able to compensate elastically the fraction of the total applied load on the cell which cannot be sustained by the specimen. Analysing 78 tests results, parameter evolutions depending on the maximal strength fc are determined in order to define accurately the monoaxial behaviour of concrete. Similar envelope curves for compression and tension have been observed, and thus a single analytical formulation is proposed for both loadings. The evolution of different parameters such as modules or residual strains for well-defined states makes possible the modelisation of hysteretic loops, including unloading, reloading and combined phases. The main advantage of this approach is to propose an analytical cyclic behaviour of normalized concrete cylinders tested under compression and tension, to be easily introduced into the numerical analysis of reinforced concrete structures. This formulation has been used in a simulation program giving accurate results compared with data obtained from large-scale beams tested under cyclic loadings. Furthermore, this model can be adapted for other purposes such as fatigue; complementary experimental data are needed.
Contribution à l'analyse expérimentale du comportement mécanique cyclique du béton
Résumé La prévision de la réponse d'un élément en béton armé soumis à des sollicitations normales cycliques nécessite la connaissance des lois de comportement du matériau, notamment du béton. On montre qu'avec une cellule spécifique peu onéreuse, placée sous une presse conventionnelle, on peut obtenir des résultats expérimentaux sur cylindres normalisés en compression, en traction et sous cycles combinés. Soixante dix-huit résultats sont analysés et permettent de définir un modèle dépendant uniquement de la résistance caractéristique du béton. Ce modèle offre l'avantage d'avoir une formulation analytique simple, similaire en compression et en traction et d'être réaliste dans la représentation des boucles d'hystérésis en compression.
Summary In order to predict the mechanical response of a reinforced concrete frame submitted to normal cyclic loadings, it is necessary to take into account constitutive laws translating accurately the non-linear compressive and tensile properties and the hysteretic loops during cycles, especially in the case of concrete. After designing a specific and economic cell called ‘CT’ (compression tension), it is possible to test normalized concrete cylinders (16×32 cm) under combined compression and tension loadings using a conventional testing machine. Continuous curves with descending branch and cycles are obtained. The fundamental idea is that the cell is able to compensate elastically the fraction of the total applied load on the cell which cannot be sustained by the specimen. Analysing 78 tests results, parameter evolutions depending on the maximal strength fc are determined in order to define accurately the monoaxial behaviour of concrete. Similar envelope curves for compression and tension have been observed, and thus a single analytical formulation is proposed for both loadings. The evolution of different parameters such as modules or residual strains for well-defined states makes possible the modelisation of hysteretic loops, including unloading, reloading and combined phases. The main advantage of this approach is to propose an analytical cyclic behaviour of normalized concrete cylinders tested under compression and tension, to be easily introduced into the numerical analysis of reinforced concrete structures. This formulation has been used in a simulation program giving accurate results compared with data obtained from large-scale beams tested under cyclic loadings. Furthermore, this model can be adapted for other purposes such as fatigue; complementary experimental data are needed.
Contribution à l'analyse expérimentale du comportement mécanique cyclique du béton
Sulayfani, B. (author) / Lamirault, J. (author)
Materials and Structures ; 20 ; 283-292
1987-07-01
10 pages
Article (Journal)
Electronic Resource
French
Contribution à l'analyse expérimentale du comportement mécanique cyclique du béton
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