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Titre : Dynamique de l’interaction sol structure par la méthode des éléments spectraux. Type de document : texte imprimé Auteurs : Souad Boudaa, Auteur ; Salah Khalfallah, Directeur de thèse Mention d'édition : 20/01/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 100 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie CivilTags : Génie civil :structure Interaction sol-poutre statique Sols multicouches Modèle de la fondation élastique à deux paramètres Méthode des éléments finis Fondation élastique Couche de ballast Propriétés du sol Vibrations libres Méthode des éléments spectraux Analyse dynamique Interaction sol-structure Static soil-beam interaction Multi-layered soils Model of the elastic foundation with two parameters Finite
element method Elastic foundation Ballast layer Soil properties Free vibrations Spectral element method Dynamic analysis Soil-structure interaction تفاعل تربة-رافدة ساكن التربة المتعددة الطبقات نموذج الأساس المرن ذو المعلمتين طريقة العناصر المنتهية الأساس المرن طبقة الصابورة خصائص التربة الاهتزازات الحرة طريقة العناصر الطيفية التحليل الديناميكي تفاعل تربة-هيكلIndex. décimale : 624 Génie civil Résumé :
This work consists of the simulation of the behavior of the soil-structure interaction, using the spectral element method (SEM). First, we analyzed the static interaction between a beam and a stratified soil using a two-parameter elastic foundation with the finite element method. The behavior of the ground medium and of the beam is supposed to be linear, homogeneous and isotropic. Using the strain energy expressions, the shear strains of the beam element and the subgrade are taken into account. In this approach, the stiffness matrix of each component is developed and integrated into the finite element analysis. Several examples are treated to show the effectiveness of the proposed approach and the capacity of the digital program developed. Then, a parametric study is carried out to highlight the influence of the mechanical properties of the soil on the soil-beam contact interface and on the responses of the beam, the effect of the depth of the soil, of the ballast layer on the response of the interface and of the beam itself. Second, we made an analysis of the soil-structure interaction by the spectral element method. We used the Finite Element Method (FEM) too, but only to prove the robustness of the SEM. The numerical results show that the convergence of the SEM is very fast compared to that of the FEM. The resolution of the problem with the eigenvalues is made, the natural frequencies are tabulated for the first three modes of vibration. A modal analysis with and without elastic medium is realised. We established a parametric study to investigate the behavior of the concrete beam on an elastic foundation, the effect of the length of the beam, the effect of soil properties and the influence of non-classical boundary conditions. Finally, we have shown that the dynamic response of the beam on an elastic foundation is highly affected by the contribution of rotational springs.
Various results are obtained and commented.
Diplôme : Doctorat en sciences En ligne : ../theses/gcivil/BOU7722.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11556 Dynamique de l’interaction sol structure par la méthode des éléments spectraux. [texte imprimé] / Souad Boudaa, Auteur ; Salah Khalfallah, Directeur de thèse . - 20/01/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 100 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie CivilTags : Génie civil :structure Interaction sol-poutre statique Sols multicouches Modèle de la fondation élastique à deux paramètres Méthode des éléments finis Fondation élastique Couche de ballast Propriétés du sol Vibrations libres Méthode des éléments spectraux Analyse dynamique Interaction sol-structure Static soil-beam interaction Multi-layered soils Model of the elastic foundation with two parameters Finite
element method Elastic foundation Ballast layer Soil properties Free vibrations Spectral element method Dynamic analysis Soil-structure interaction تفاعل تربة-رافدة ساكن التربة المتعددة الطبقات نموذج الأساس المرن ذو المعلمتين طريقة العناصر المنتهية الأساس المرن طبقة الصابورة خصائص التربة الاهتزازات الحرة طريقة العناصر الطيفية التحليل الديناميكي تفاعل تربة-هيكلIndex. décimale : 624 Génie civil Résumé :
This work consists of the simulation of the behavior of the soil-structure interaction, using the spectral element method (SEM). First, we analyzed the static interaction between a beam and a stratified soil using a two-parameter elastic foundation with the finite element method. The behavior of the ground medium and of the beam is supposed to be linear, homogeneous and isotropic. Using the strain energy expressions, the shear strains of the beam element and the subgrade are taken into account. In this approach, the stiffness matrix of each component is developed and integrated into the finite element analysis. Several examples are treated to show the effectiveness of the proposed approach and the capacity of the digital program developed. Then, a parametric study is carried out to highlight the influence of the mechanical properties of the soil on the soil-beam contact interface and on the responses of the beam, the effect of the depth of the soil, of the ballast layer on the response of the interface and of the beam itself. Second, we made an analysis of the soil-structure interaction by the spectral element method. We used the Finite Element Method (FEM) too, but only to prove the robustness of the SEM. The numerical results show that the convergence of the SEM is very fast compared to that of the FEM. The resolution of the problem with the eigenvalues is made, the natural frequencies are tabulated for the first three modes of vibration. A modal analysis with and without elastic medium is realised. We established a parametric study to investigate the behavior of the concrete beam on an elastic foundation, the effect of the length of the beam, the effect of soil properties and the influence of non-classical boundary conditions. Finally, we have shown that the dynamic response of the beam on an elastic foundation is highly affected by the contribution of rotational springs.
Various results are obtained and commented.
Diplôme : Doctorat en sciences En ligne : ../theses/gcivil/BOU7722.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11556 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7722 BOU/7722 Thèse Bibliothèque principale Thèses Disponible Modélisation par la méthode des éléments finis du comportement dynamique du couple roue-rail. / Latifa Boussalia
Titre : Modélisation par la méthode des éléments finis du comportement dynamique du couple roue-rail. Type de document : texte imprimé Auteurs : Latifa Boussalia, Auteur ; Ahmed Bellaouar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 140 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Génie Mécanique: Construction Mécanique Contact roulant contact roue-rail modélisation numérique défauts géométriques analyse modale analyse dynamique éléments finis Rolling contact wheel-rail contact numerical modeling geometrical defects modal analysis dynamic analysis finite elements الالتماس الدوراني التماس عجلة-سكة النمذجة العددية العيوب الهندسية تحليل الوسائط التحليل الديناميكي العناصر المحدودة Index. décimale : 620 Génie Mécanique Résumé :
The work presented in this thesis highlights the influence of geometrical singularities on the mechanical behavior of wheel-rail torque. With the increase in the loads transported by axles, the traffic speeds and the state of the tracks, the damage of the wheels is very solicited, leading to more or less serious accidents. The tool used is the ANSYS software based on numerical modeling using the finite element method. The objective of this thesis has been to develop a complete approach to a dynamic analysis of the wheels of the railcar and the wheel-rail pair in contact, allowing to take into account the local demands from the real geometry of the contact wheel- rail, the elastic behavior of the wheel material and the rail (steel) and the operating conditions (load on the wheel and speed). The proposed digital approach deals with two main parts. In the first part, a static analysis was carried out, aiming to model the mechanical behavior of a wheel with different forms of geometrical defects on the tread (circular shape, elliptical shape and any shape, and a perfect wheel), and the wheel-rail pair in contact. In the second part, the dynamic problem of the wheel-rail contact is solved by using the implicit temporal integration scheme. The 3D model developed takes into account only the elastic behavior of the bodies in contact, in the presence of the geometrical defect. However, the central problem in the dynamics of the couple in contact is solved by simplified methods based on the Hertz and Kalker theories implemented in the majority of finite element calculation codes. Finally, a comparative study using a simple modal analysis between the own frequencies of the wheel with and without defect has been proposed. In order to check the vibratory response of these, and to understand exactly how the vibrations may produce minor or catastrophic reactions. However, the different results were validated by an analytical calculation based on the Hertz theory and by some works in the literature.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU7420.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11073 Modélisation par la méthode des éléments finis du comportement dynamique du couple roue-rail. [texte imprimé] / Latifa Boussalia, Auteur ; Ahmed Bellaouar, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 140 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Génie Mécanique: Construction Mécanique Contact roulant contact roue-rail modélisation numérique défauts géométriques analyse modale analyse dynamique éléments finis Rolling contact wheel-rail contact numerical modeling geometrical defects modal analysis dynamic analysis finite elements الالتماس الدوراني التماس عجلة-سكة النمذجة العددية العيوب الهندسية تحليل الوسائط التحليل الديناميكي العناصر المحدودة Index. décimale : 620 Génie Mécanique Résumé :
The work presented in this thesis highlights the influence of geometrical singularities on the mechanical behavior of wheel-rail torque. With the increase in the loads transported by axles, the traffic speeds and the state of the tracks, the damage of the wheels is very solicited, leading to more or less serious accidents. The tool used is the ANSYS software based on numerical modeling using the finite element method. The objective of this thesis has been to develop a complete approach to a dynamic analysis of the wheels of the railcar and the wheel-rail pair in contact, allowing to take into account the local demands from the real geometry of the contact wheel- rail, the elastic behavior of the wheel material and the rail (steel) and the operating conditions (load on the wheel and speed). The proposed digital approach deals with two main parts. In the first part, a static analysis was carried out, aiming to model the mechanical behavior of a wheel with different forms of geometrical defects on the tread (circular shape, elliptical shape and any shape, and a perfect wheel), and the wheel-rail pair in contact. In the second part, the dynamic problem of the wheel-rail contact is solved by using the implicit temporal integration scheme. The 3D model developed takes into account only the elastic behavior of the bodies in contact, in the presence of the geometrical defect. However, the central problem in the dynamics of the couple in contact is solved by simplified methods based on the Hertz and Kalker theories implemented in the majority of finite element calculation codes. Finally, a comparative study using a simple modal analysis between the own frequencies of the wheel with and without defect has been proposed. In order to check the vibratory response of these, and to understand exactly how the vibrations may produce minor or catastrophic reactions. However, the different results were validated by an analytical calculation based on the Hertz theory and by some works in the literature.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU7420.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11073 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7420 BOU/7420 Thèse Bibliothèque principale Thèses Disponible
Titre : Analyse dynamique des coques par les méthodes d'interation directe Type de document : texte imprimé Auteurs : CHérif Saadane Chouchaoui ; U.S.T.H.B., Éditeur scientifique ; A.E.K. Chelghoum, Directeur de thèse Année de publication : 1990 Importance : 100 f. Note générale : 2 Disponibles au magasin de la bibliothèque centrale Langues : Français (fre) Catégories : Français - Anglais
Génie CivilTags : Analyse dynamique Coques Interaction directe Index. décimale : 624 Génie civil Permalink : index.php?lvl=notice_display&id=506 Analyse dynamique des coques par les méthodes d'interation directe [texte imprimé] / CHérif Saadane Chouchaoui ; U.S.T.H.B., Éditeur scientifique ; A.E.K. Chelghoum, Directeur de thèse . - 1990 . - 100 f.
2 Disponibles au magasin de la bibliothèque centrale
Langues : Français (fre)
Catégories : Français - Anglais
Génie CivilTags : Analyse dynamique Coques Interaction directe Index. décimale : 624 Génie civil Permalink : index.php?lvl=notice_display&id=506 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHO/2665 CHO/2665 Thèse Bibliothèque principale Thèses Disponible
Titre : Dynamic analysis of linear framed structures on microcomputers Type de document : texte imprimé Auteurs : Mohamed Balah ; A.H. Peyrot, Directeur de thèse ; University of Wisconsin, Éditeur scientifique Année de publication : 1987 Importance : 181 f. Note générale : 1 Disponible dans la salle de recherche Langues : Anglais (eng) Catégories : Français - Anglais
Génie CivilTags : Micro-ordinateur Analyse dynamique Index. décimale : 624 Génie civil Permalink : index.php?lvl=notice_display&id=640 Dynamic analysis of linear framed structures on microcomputers [texte imprimé] / Mohamed Balah ; A.H. Peyrot, Directeur de thèse ; University of Wisconsin, Éditeur scientifique . - 1987 . - 181 f.
1 Disponible dans la salle de recherche
Langues : Anglais (eng)
Catégories : Français - Anglais
Génie CivilTags : Micro-ordinateur Analyse dynamique Index. décimale : 624 Génie civil Permalink : index.php?lvl=notice_display&id=640 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BAL/1629 BAL/1629 Thèse Bibliothèque principale Thèses Disponible
