Browsing by Author "Lahdiri, Abdelhafid"

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    Free vibration behaviour of multi-directional functionally graded imperfect plates using 3D isogeometric approach
    (Techno-Press, 2022) Lahdiri, Abdelhafid; Kadri, Mohammed
    In this paper the free vibration frequencies of tri-directional functionally graded materials imperfect plate is investigated for Several plate geometries with two types of porosity (even and uneven) and different type of material configuration. The effect of several parameters such as power law index and boundary conditions have been investigated. For this purpose, an efficient computational method is developed and written under Matlab environment, based on a three dimensional modeling and the isogeometric method is used for the discretization of the structure based on NURBS (Non uniform rational B-spline) basis functions. The results obtained by the present method are validated by the comparison with the results given by several authors in the literature.
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    Résolution des problèmes dynamiques couplés par des méthodes alternatives
    (Université M'Hamed Bougara : Faculté de Technologie, 2023) Lahdiri, Abdelhafid; Kadri, Mohammed(Directeur de thèse)
    Dans ce travail, la méthode isogéométrique est appliquée pour calculer et résoudre des problèmes dynamiques couplés afin de résoudre les différents inconvénients de la méthode classique des éléments finis. Elle garantit une reproduction exacte de la géométrie qui reste inchangée après le raffinement, supprime le temps de conversion entre le modèle de conception assisté par ordinateur et l'analyse, simplifie la procédure de maillage et améliore les fonctions d'approximation. La méthode est appliquée à trois types d'éléments : éléments solides plans pour le cas d'un barrage poids, qui comprend une étude du barrage vide à base fixe, une interaction fluide-structure et une interaction fluide-sol-structure ; éléments solides pour le cas d'une plaque à matériaux à gradient fonctionnel ; et éléments Shell pour le cas d'un silo de stockage. Le comportement vibratoire, la réponse linéaire et non linéaire, sont examinés
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    Seismic response of concrete gravity dam with soil structure interaction using isogeometric approach.
    (2019) Lahdiri, Abdelhafid; Kadri, Mohammed
    The paper deals with the numerical analyses carried out on the Oued-Fodda concrete gravity dam under earthquake shaking with account of soil structure interaction. The seismic behavior of the dam-soil system is performed by the isogeometric approach based on the NURBS shape functions and the water mobilized by the dam is modeled with the Westergaard’s mass added approach usually applied in most of literature studies. The motion equations are solved by the direct integration method of Newmark. The results are compared with the results obtained by SAP code and other authors using the finite element method. The effect of soil structure interaction is evidenced by comparing displacements at the dam crest