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<dc:title xml:lang="fr">Etude du comportement du néoprène et d'appareils d'appui parasismiques en néoprène fretté</dc:title>
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<dc:subject xml:lang="fr">Elastomère</dc:subject>
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<dc:subject xml:lang="fr">Piezo-dépendance</dc:subject>
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<dc:subject xml:lang="fr">Appareil d'Appui en Néoprène Fretté</dc:subject>
<dc:subject xml:lang="fr">Sismologie</dc:subject>
<dc:subject xml:lang="en">Rubber</dc:subject>
<dc:subject xml:lang="en">Mullins effect</dc:subject>
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<dcterms:abstract xml:lang="fr">Selon l’Eurocode 8 et la norme EN 1337-3, le comportement de l’Appareil d'Appui en Néoprène Fretté (AANF) est considéré comme élastique linéaire ou hystérétique linéaire. En réalité, les comportements mécaniques de l’AANF sont très complexes et sont essentiellement ceux du néoprène tels que l’élasticité non linéaire, la viscosité, la plasticité, l’effet Payne, l’effet Mullins, etc. Toutefois, très peu d’études de l’effet Mullins et de la piezo-dépendance existent, et aucun modèle par éléments finis ne permet de modéliser ces phénomènes dans l’AANF. L’objectif de cette thèse est donc l’étude de ces phénomènes sur le néoprène et sur l’AANF. Pour atteindre ces objectifs, la caractérisation de ces phénomènes sur le néoprène est tout d’abord réalisée avec différents types de chargements tels que la relaxation, la traction cyclique, la compression cyclique, le couplage compression statique – cisaillement cyclique. De plus, un dispositif biaxial original est fabriqué afin de caractériser l’AANF sous le chargement de compression statique couplé au cisaillement cyclique. Grâce à ces résultats expérimentaux, un nouveau modèle est développé, permettant de modéliser simultanément l’effet Mullins, la piezo-dépendance ainsi que la viscoélasticité non linéaire du néoprène.</dcterms:abstract>
<dcterms:abstract xml:lang="en">High Damping Rubber Bearings (HDRB) composed of alternating thin horizontal layers of elastomer bonded to steel plates are used to support permanent static loading in compression and cyclic shear in case of earthquakes. The behaviour of HDRB is considered to be linear elastic or linear hysteretic according to The European Standard Eurocode 8 and The Standard EN 1337 - 3. The mechanical behaviour of HDRB under loading is actually very complex and essentially linked to the behaviour of elastomer such as nonlinear elasticity, viscosity, plasticity, Payne effect, and Mullins effect. However, the coupling of Mullins effect and nonlinear viscosity as well as influence of hydrostatic stress on viscoelasticity of elastomer or of HDRB has not been studied yet. The aim of this thesis is thus the study of these effects on elastomer and on HDRB. In order to reach these objectives, characterization of these effects on elastomer is firstly performed with different types of loading such as relaxation test, cyclic tensile test, cyclic compression test and combined static compression – cyclic shear test. Furthermore, an original biaxial device is designed and manufactured in order to characterize the behaviour of HDRB under combined static compression – cyclic shear. Based on these experiments a new finite model is developped to simulate simultaneously Mullins effect, nonlinear viscosity and influence of hydrostatic stress on viscoelasticity of elastomer. Subsequently, this model is used to simulate the response of the HDRB under combined static compression - cyclic shear.</dcterms:abstract>
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