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Caractérisation et modélisation du comportement des jonctions voile-plancher en béton armé pour l’analyse sismique des ouvrages de Génie Civil et des équipements

Abstract : As part of the periodic reassessments of the seismic safety of nuclear installations, EDF has to characterize the behavior of the structures of reinforced concrete nuclear buildings and the equipment they support. Engineering studies are based on finite element numerical simulation. To improve the capabilities of these calculations, EDF launched a research program on the experimental characterization and numerical modeling of the reinforced concrete structures wall-slab connections under seismic loading conditions. The objective is twofold: on the one hand, to refine the calculations of the earthquake spectra transmitted to the equipment supported on the floors, on the other hand, to refine the robustness assessments in the areas around the connections (transmitted forces, reinforcement requirements).The experimental campaign includes a series of two times two reduced-scale reinforced concrete mock-ups, subjected to quasi-static and dynamic cyclic loading by means of the CEA's Azalée vibrating table, in out-of-plane bending and in shear in the slab plane.As already existing in the literature for column-beam junctions, a model of the connection compatible with a plate or shell finite element model of the building is proposed. Its objective is to idealize the specific contribution of the connection in terms of kinematics, stiffness, redistribution of forces and resistance.The contributions of this model are then evaluated based on the results of several experimental campaigns, in particular the test campaign cited above, but also previous campaigns on the dynamic behavior of slabs in nuclear structures. The feasibility of applying the model to an industrial study is also assessed by means of the study of a typical nuclear building. The use of the model made it possible to highlight design margins in terms of reinforcement and floor spectra levels.
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Submitted on : Wednesday, July 8, 2020 - 4:12:00 PM
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Estelle Secourgeon. Caractérisation et modélisation du comportement des jonctions voile-plancher en béton armé pour l’analyse sismique des ouvrages de Génie Civil et des équipements. Génie civil. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASN015⟩. ⟨tel-02893926⟩

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