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Contribution à la modélisation numérique de la réponse sismique des ouvrages avec interaction sol-structure et interaction fluide-structure : application à l'étude des barrages poids en béton

Abstract : Modeling fluid-structure and soil-structure interaction problems covers several research fields dealing with multiple aspects such as : unbounded geometry of soil media and in some cases of retained fluid, viscous and radiation dissipative effects, application of seismic loading, choice of the basic variables, algebraic properties of the resulting coupled system, ... etc. In this work, different numerical models of soil-structure and fluid-structure coupling have been studied. The truncation boundaries of the soil and of the fluid domains have been considered by using infinite elements whose performances were compared to those of radiation conditions. The problem of the free coupled vibrations of the fluid-structure systems has been solved by introducing efficient symmetrization techniques. In addition, a new symmetric boundary element formulation is proposed. It allows to produce a positive definite and symmetric matrix and therefore to conduct to an algebraic system similar to the one obtained from finite element discretization. The produced matrix called "equivalent stiffness matrix" can easily be assembled or coupled to finite element matrices. All of the applications which have been done in order to compare models or to validate the developed programs were built in the case of concrete gravity dams, which constitute typical coupled fluid- soil-structure problems
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Abdelghani Seghir. Contribution à la modélisation numérique de la réponse sismique des ouvrages avec interaction sol-structure et interaction fluide-structure : application à l'étude des barrages poids en béton. Autre. Université Paris-Est, 2010. Français. ⟨NNT : 2010PEST1090⟩. ⟨tel-00627044⟩

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