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Poster

Modeling of 1D wave propagation in nonlinear soils using the elasto-plastic Iwan model by four numerical schemes

Abstract : The international project PRENOLIN is focused on verification and validation of numerical codes for ground motion simulations including nonlinear soil rheologies. In this particular study, we present implementations of the elasto-plastic Iwan model (Iwan, 1967) into numerical schemes based on finite-difference, finite element, spectral element and discontinuous Galerkin methods, and results based on test numerical simulations. We study the amplification of ground motion in a soft layer with nonlinear behavior overlying a halfspace with linear behavior. We assume a vertically incident plane SH wave with source-time function given by a Gabor wavelet. We include different amplitude levels and frequency ranges. Special attention is given to the hysteresis loops and the reversal points in the stress-strain plane, and their effects on the computed seismograms and corresponding transfer functions. We compare key aspects of the individual numerical schemes and methods, and their advantages and disadvantages.
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https://hal-brgm.archives-ouvertes.fr/hal-01143333
Contributeur : Florent de Martin <>
Soumis le : vendredi 17 avril 2015 - 12:30:32
Dernière modification le : mercredi 16 septembre 2020 - 14:40:03
Archivage à long terme le : : lundi 14 septembre 2015 - 10:15:54

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ssa2015_Iwan.pdf
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  • HAL Id : hal-01143333, version 1

Citation

Diego Mercerat, Luis Fabian Bonilla, Florent de Martin, Elise Delavaud, Nathalie Glinsky, et al.. Modeling of 1D wave propagation in nonlinear soils using the elasto-plastic Iwan model by four numerical schemes. Seismological Society of America, 2015 Annual Meeting, Apr 2015, Pasadena, United States. ⟨hal-01143333⟩

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