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16 results on '"Semblat, J. F."'

1. Effet de la pression interstitielle sur la réponse sismique des sols : modélisation numérique 1D-3 Composantes

Author

Pham, V-A, Bonilla, F, Lenti, L, Semblat, J-F, Santisi D'Avila, Maria Paola, Séismes et Vibrations (IFSTTAR/GERS/SV), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Communauté Université Paris-Est, Laboratoire Jean Alexandre Dieudonné (JAD), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations
Abstract

International audience; During strong quakes, the propagation of seismic waves in soil layers involves nonlinearities changing with the excitation level. A nonlinear hysteretic law is necessary to describe the variations of the stiffness and the energy dissipation during the seismic shaking. Furthermore, the influence of the pore pressure (cyclic mobility and liquefaction) cannot be neglected for saturated soils under strong quakes. Starting from a FEM formulation describing 1D propagation and three-dimensional loading ("1D-3 components approach"), the influence of the water is accounted for through a relation between the pore pressure and the work of the shear stress initially proposed by Iai. This model describes the variations of the pore pressure from the three-dimensional stress state of the soil. It has been validated through comparisons to laboratory tests (cyclic triaxial tests on saturated sands) and an analysis under three-dimensional excitations (seismic loading polarized along the 3 directions of space). The results involving 3 simultaneous excitation components and a single component in 3 separated analyses show the influence of the loading path on the seismic response and the pore pressure build-up.

Published
2015

5. Accélération des calculs de propagation d'ondes élastiques par la Méthode multipôle rapide

Author

Chaillat, Stéphanie, Bonnet, Marc, Semblat, J. F., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph]
Published
2007

6. Fast multipole boundary integral equation method for 3D seismic wave propagation in alluvial basins

Author

Chaillat, Stéphanie, Bonnet, Marc, Semblat, J. F., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph]
Published
2007

7. A fast multipole accelerated BEM for 3-D seismic wave computation

Author

Chaillat, Stéphanie, Bonnet, Marc, Semblat, J. F., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph]
Published
2007

8. Numerical analysis of seismic wave amplification in Nice (France) and comparisons with experiments

Author

Duval, Anne-Marie, Semblat, J.-F, Duval, A.-M, Dangla, Patrick, Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Territoires et Ville (Cerema Direction Territoires et Ville), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema), Division Mécanique des Sols des Roches et de la Géologie de l'Ingénieur (LCPC/MSRGI), Laboratoire Central des Ponts et Chaussées (LCPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), ERA 6 Risque sismique (ERA 6 Risque sismique - Equipe recherche associée au LCPC), Avant création Cerema, Laboratoire des matériaux et structures du génie civil (LMSGC), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Central des Ponts et Chaussées (LCPC), and Laboratoire Central des Ponts et Chaussées (LCPC)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Microtremors, Wave amplification, 0211 other engineering and technologies, Site effects, Soil Science, FOS: Physical sciences, Geometry, 02 engineering and technology, Physics - Classical Physics, 010502 geochemistry & geophysics, 01 natural sciences, Damping, Viscoelasticity, Seismic wave, Physics::Geophysics, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], Boundary element method, Weak motion, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Civil and Structural Engineering, Numerical analysis, Seismic loading, Linear elasticity, Isotropy, Classical Physics (physics.class-ph), Seismic site effects, Geotechnical Engineering and Engineering Geology, Numerical modelling, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Geology
Abstract

International audience; The analysis of site effects is very important since the amplification of seismic motion in some specific areas can be very strong. In this paper, the site considered is located in the centre of Nice on the French Riviera. Site effects are investigated considering a numerical approach (Boundary Element Method) and are compared to experimental results (weak motion and microtremors). The investigation of seismic site effects through numerical approaches is interesting because it shows the dependency of the amplification level on such parameters as wave velocity in surface soil layers, velocity contrast with deep layers, seismic wave type, incidence and damping. In this specific area of Nice, a one-dimensional (1D) analytical analysis of amplification does not give a satisfactory estimation of the maximum reached levels. A boundary element model is then proposed considering different wave types (SH, P, SV) as the seismic loading. The alluvial basin is successively assumed as an isotropic linear elastic medium and an isotropic linear viscoelastic solid (standard solid). The thickness of the surface layer, its mechanical properties, its general shape as well as the seismic wave type involved have a great influence on the maximum amplification and the frequency for which it occurs. For real earthquakes, the numerical results are in very good agreement with experimental measurements for each motion component. Two-dimensional basin effects are found to be very strong and are well reproduced numerically.

Published
2000
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9. 3D Hopkinson bar: new experiments for dynamic testing on soils

Author

Semblat, J. F., Luong, M. P., Gary, G., Division Mécanique des Sols des Roches et de la Géologie de l'Ingénieur (LCPC/MSRGI), Laboratoire Central des Ponts et Chaussées (LCPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), and École polytechnique (X)-Mines Paris - PSL (École nationale supérieure des mines de Paris)

Subjects
soil dynamics, Hopkinson bar, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], fast dynamics, Classical Physics (physics.class-ph), FOS: Physical sciences, Physics - Classical Physics
Abstract

International audience; The direct analysis of the dynamic response of materials is possible using Split Hopkinson pressure bar method. For soils, it has to be adapted since the specimen has generally poor mechanical properties. An original experimental arrangement called "Three-Dimensional Split Hopkinson Pressure Bar" (3D SHPB) is proposed. It allows the measurement of the complete three-dimensional dynamic response of soils. Different types of confinement systems are used. The results on different loading paths are compared with other works on sand and clay. The analysis at grain-size level gives further elements on the comminution process.

Published
1999

10. Propagation d'ondes en milieu centrifugé: analyse de la dispersion et de l'atténuation

Author

Semblat, J. F., Luong, M. P., Laboratoire Central des Ponts et Chaussées (LCPC), Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]
Abstract

Les phénomènes de propagation d’ondes dans les sois peuvent être simulés expérimentalement sur modèles réduits centrifugés. Deux types de sollicitation sont utilisés : simulation de séismes, chute de masse sphérique en surface. La propagation est analysée en termes de lois de dispersion. Il est tenu compte des réflexions d’ondes sur les parois (élimination par filtrage homomorphique). Pour les essais de chute de masse, l’analyse du champ d’ondes sphériques en viscoélasticité linéaire conduit à une description analytique complète de la propagation.

Published
1998
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11. Wave propagation through soils in centrifuge testing

Author

Semblat, J. F., Luong, M. P., Division Mécanique des Sols des Roches et de la Géologie de l'Ingénieur (LCPC/MSRGI), Laboratoire Central des Ponts et Chaussées (LCPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Laboratoire de mécanique des solides (LMS), École polytechnique (X)-Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), and École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris

Subjects
[PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], seismic waves, propagation, soils dynamics, Classical Physics (physics.class-ph), FOS: Physical sciences, dispersion, Physics - Classical Physics, centrifuge experiments, attenuation
Abstract

International audience; Wave propagation phenomena in soils can be experimentally simulated using centrifuge scale models. An original excitation device (drop-ball arrangement) is proposed to generate short wave trains. Wave reflections on model boundaries are taken into account and removed by homomorphic filtering. Propagation is investigated through dispersion laws. For drop-ball experiments, spherical wave field analysis assuming linear viscoelasticity leads to a complete analytical description of wave propagation. Damping phenomena are examined and evaluated using this description.

Published
1998
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12. Dynamic behavior of sand under SHPB loading

Author

Semblat, J. F., Luong, M. P., Gary, G., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), and Behringer, Jenkins

Subjects
[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

No abstract provided

Published
1997

13. Réponse dynamique tridimensionnelle d'un sol, essais aux barres de Hopkinson

Author

Semblat, J. F., Gary, G., Luong, M. P., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

No abstract provided

Published
1996

14. Numerical modelling of wave propagation in centrifuged medium

Author

Semblat, J. F., Jean-Jacques Brioist, Luong, M. P., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

No abstract provided

15. Wave propagation in non-homogeneous damped medium: numerical versus experimental approach

Author

Semblat, J. F., Luong, M. P., Jean-Jacques Brioist, Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

No abstract provided

16. Wave propagation in non-homogeneously damped medium: numerical versus experimental approach

Author

Semblat, J. F., Jean-Jacques Brioist, Luong, M. P., Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]
Abstract

No abstract provided

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