Ground nonlinear dynamic response by considering multi-dimensional seismic site effects

Dana Amini, Behrouz Gatmiri, Pooneh Maghoul

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Liquefaction and Seismic Slope Stability

ABSTRACT: A comprehensive study is performed to assess the ground dynamic responses by considering the nonlinear behavior of geomaterials. For this purpose, an in-house numerical code, called HYBRID, is developed to model the nonlinear behavior of geomaterials by using the Hardin-Drnevich constitutive model subject to vertically propagating sinusoidal waves. HYBRID code combines the finite elements method in the near field and the boundary elements method in the far field (FEM/BEM). Also, in order to consider the impacts of local topographical and geological conditions simultaneously, both 1D and 2D configurations are modeled. Responses are obtained for different geometrical points at the ground surface in terms of time history of displacement. Furthermore, the amplification/de-amplification patterns are underlined at different geometrical points for each configuration. Finally, some recommendations based on the presented results are proposed in order to quantify nonlinear 1D and 2D site effects.

RÉSUMÉ: Cet article présente une étude approfondie évaluant les réponses dynamiques du sol en considérant le comportement non linéaire des géomatériaux. À cet effet, un code numérique est développé pour modéliser le comportement non linéaire des géomatériaux. Ce code appelé HYBRID utilise le modèle de comportement de Hardin-Drnevich soumis à des ondes sinusoïdales se propageant verticalement. Le code HYBRID combine la méthode des éléments finis dans le champ proche et la méthode aux éléments des frontières dans le champ lointain (FEM / BEM). De plus, afin de prendre en compte simultanément les impacts des conditions topographiques et géologiques locales, les configurations 1D et 2D sont modélisées. Les réponses sont obtenues pour différents points géométriques à la surface du sol du déplacement. De plus, les motifs d'amplification et de désamplification sont soulignés à différents points dòbservation pour chaque configuration. Enfin, quelques recommandations basées sur les résultats présentés sont proposées afin de quantifier les effets non linéaires des sites 1D et 2D.

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Cite this article:
Dana Amini; Behrouz Gatmiri; Pooneh Maghoul (2019) Ground nonlinear dynamic response by considering multi-dimensional seismic site effects in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper327,author = Dana Amini; Behrouz Gatmiri; Pooneh Maghoul,title = Ground nonlinear dynamic response by considering multi-dimensional seismic site effects ,year = 2019}