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Modélisation du comportement cyclique alterné du béton armé. Application à divers essais statiques de poteaux

Abstract : The behavior of structures under seismic loads needs a good knowledge of materials behavior under these loads. In this study, the model for the concrete behavior is based on the theory of damage, on the mechanics of continuum media and the thermodynamics of irreversible processes. This model takes into account the inelastic deformation and the loss of rigidity due to cracking. The biaxial and the creep effects are not considered. The behavior of the reinforcement steel is elastic perfectly plastic. An important improvement for the application of the model has been to define a method of identification of parameters based on physical data obtained from concrete classical tests and from an analytical expression of the behavior law of common use. The monoaxial model is implemented in a numerical code for plane structures. The analysed structure is discretised into several beam elements. Each element is represented by a certain number of sections. The section is divided into fibers subjected to monoaxial sollicitations. Each fiber follows its own history that is comformable to the model; its deformation agrees with the plane section hypothesis. Validation tests have been carried out on standard cylinders subjected to repeated compressive loads. Other tests are also performed on short columns under normal reversible forces and on columns under alternate bending forces. The comparison between the model and tests gives encouraging results for analysis of plane reinforced concrete structure under cyclic loading.
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Submitted on : Monday, October 4, 2010 - 11:21:49 AM
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  • HAL Id : tel-00523013, version 1

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Mohammed Bénali Benmansour. Modélisation du comportement cyclique alterné du béton armé. Application à divers essais statiques de poteaux. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1997. Français. ⟨tel-00523013⟩

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