Modélisation simplifiée 3D de l'interaction sol-structure: application au génie parasismique.

Abstract : In structural engineering, Soil-Structure Interaction (SSI) is an important phenomenon that has to be taken into account. This paper presents a 3D non linear interface element able to compute SSI for rigid circular, rectangular or strip shape footings considering two types of non-linearties. A material non-linearity (plasticity of the soil) and a geometrical non-linearity (uplift mechanism). Several approaches exist to take this phenomenon into account: the following work is based on the "macro-element" concept. The particularity of the macro-element lies in the fact that the movement of the foundation is entirely described by a system of generalised variables (forces and displacements) defined in the foundation centre with five degrees of freedom. Torque moment is not taken into account. The non linear behaviour of the soil and the uplift mechanism are reproduced using the classical theory of plasticity. Coupling of the different mechanisms is straight forward following the multi-mechanism theory. The element is able to simulate the 3D behaviour of a rigid shallow foundation under static and dynamic loadings. It is implemented into FedeasLab, a finite element Matlab toolbox. Comparisons with experimental results on foundations but also civil engineering structures (buildings and bridges...) under monotonic, cyclic and dynamic loadings show the good performance of the approach. The efficiency of this new tool allows us doing further parametrical studies for different soils that are presented at the end of this document.
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Submitted on : Monday, July 28, 2008 - 3:37:45 PM
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Stéphane Grange. Modélisation simplifiée 3D de l'interaction sol-structure: application au génie parasismique.. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00306842⟩

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