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Modélisation par éléments finis des actions des matériaux granulaires sur les parois de silos

Abstract : The design of storage structures requires, above all, the calculation of the normal pressures on silo walls. Two methods of calculation are generally used, the analytical and the numerical method. The analytical methods are generally used for practical and rapid calcultations in slender silos. However, if we consider the complex behavior of the ensiled material, the effect of wall flexibility, and the behavior of the material-wall interface, only a numerical finite element technique can be used. Earlier studies, using this method, often consider a complex behavior of the ensiled material, however, show a simple behavior in the material-wall interface, and the effect of wall flexibility is usually neglected. Our aim is to study the pressure distributions in circular silos with flexible walls, and to show that comparatively simple finite element techniques, which include appropriate wall friction characteristics, can accurately model the pressures exerted by stored solids on silo walls in filling conditions. Four different contact elements are apllied to the interface, two for the cylindrical section and two for the conical section. The performance of this method is very satisfactory compared to the experimental, theoretical and numerical results, for the squat and slender silos. It can be noted that the use of a very sophisticated behavior law for ensiled material is not necessary, whereas an exact modeling of the wall friction is vital. However, if necessary, a more complex behavior of ensiled material can be incorporated into this study
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Submitted on : Tuesday, April 24, 2018 - 4:08:23 PM
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  • HAL Id : tel-01776913, version 1



Ali Reza Naddaf Oskouei. Modélisation par éléments finis des actions des matériaux granulaires sur les parois de silos. Sciences de l'ingénieur [physics]. Université Paul Verlaine - Metz, 1995. Français. ⟨NNT : 1995METZ015S⟩. ⟨tel-01776913⟩



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