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Vulnérabilité et spectres de plancher des structures sismiquement isolées

Khac Hoan Pham 1, 2
2 EMSI - Laboratoire d'Etudes de Mécanique Sismique
SEMT - Service d'Etudes Mécaniques et Thermiques : DEN/DM2S/SEMT
Abstract : This thesis was motivated by issues that arise regarding the use of the method of seismic isolation in the nuclear industry. Despite the research conducted during the last decades in the field of seismic isolation, many questions about the behavior of isolated structures remain. These questions concern, on the one hand, the vulnerability of these structures, due to an excursion (unexpected) in the post-linear domain, and on the other hand, phenomena that can lead to a significant excitation of none isolated modes. Furthermore, unlike previous work studying the seismic behavior of buildings, an important part of this thesis is devoted to the behavior of equipment through the study of floor spectra. Firstly, the probability of failure, in the case of nonlinear response of the superstructure, was studied with simple models, for different laws of nonlinear behavior and different types of support. Then, the effects of heavy damping were investigated and the mechanism of amplification of the response of non-isolated modes has been explained. To resolve the amplification problem of none isolated modes, the mixed isolated systems, combining passive isolation with semi-active devices, have been considered. The numerical analyses confirm the effectiveness of this approach. Finally, a series of shaking table tests on a simple model with two degrees of freedom was conducted. The model is equipped with a magneto-rheological damper which is controlled as a semi-active device. The comparison of the experimental results with those of numerical simulations shows that the models developed are able to represent satisfactorily the essential physical phenomena.
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Submitted on : Wednesday, October 27, 2010 - 4:03:55 PM
Last modification on : Thursday, September 24, 2020 - 4:00:22 PM
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Khac Hoan Pham. Vulnérabilité et spectres de plancher des structures sismiquement isolées. Mécanique [physics.med-ph]. Ecole Polytechnique X, 2010. Français. ⟨pastel-00530149⟩

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