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Approche Multi Echelle De La Rupture Des Structures En Beton
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Book Synopsis Approche multi-échelle de la rupture des structures en béton by : Huu Phuoc Bui
Download or read book Approche multi-échelle de la rupture des structures en béton written by Huu Phuoc Bui and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pour l'analyse de durabilité et la conception économique (moins de matériel) de structures en matériaux ressemblant à du béton, la modélisation de la rupture est essentielle. Dans le cadre de la mécanique des milieux continus, une longueur interne est introduite dans les modèles non locaux pour remédier au problème lié à la sensibilité du maillage qui est une pathologie des modèles d'endommagement classiques , lorsqu'il s'agit de matériaux adoucissantes. Toutefois, l'évaluation de la longueur interne de hétérogénéités du matériau est toujours une question difficile, ce qui rend un problème obscur en utilisant des modèles non locaux. Nos travaux portent sur le développement d'un outil numérique basée sur la méthode des éléments en treillis (LEM) qui est un modèle discret pour la simulation et la prévision de la rupture des structures en béton. En utilisant le modèle de réseau à l'échelle mésoscopique, il n'est pas nécessaire d'introduire une longueur interne dans la loi de comportement, comme cela se fait dans les modèles non locaux, et nous pouvons affranchir ce paramètre en introduisant explicitement la mesotructure matérielle via une description géométrique. Basé sur l'outil numérique développé, nous avons étudié, en effectuant des tests numériques de traction uniaxiale, l'influence géométrique de la mesotructure du matériau ainsi que l'influence des conditions aux limites et de tailles d'échantillons (qui se traduisent par le gradient de sollicitation et le champ de rotation de matériel différents) sur le taille de la FPZ (fracture process zone) et sur la longueur caractéristique du matériau quasi-fragile homogénéisé. Ces études fournissent des recommandations/avertissements lors de l'extraction d'une longueur interne nécessaire pour les modèles nonlocaux à partir de la microstructure du matériau. Par ailleurs, les études contribuent un aperçu direct de l'origine mésoscopic de la taille FPZ et la longueur de la caractéristique du matériau, et par conséquent sur l'origine et la nature du comportement non linéaire du matériau. Ensuite, nous avons implanté le modèle du treillis dans la bibliothèque de SOFA développé par l'INRIA pour réaliser le couplage avec la méthode des éléments finis (MEF) afin de faire face avec des structures à grande échelle. Nous avons proposé un algorithme de couplage entre une approche macroscopique représentée par MEF et une approche mésoscopique infligés par LEM au sein d'une manière adaptative. Le modèle de couplage est d'abord utilisée pour valider l'approche multi-échelle proposée sur des simulations heuristiques. Et à long terme, il fournit un outil prometteur pour des simulations de grandes structures en matériaux quasi-fragiles de la vie réelle.
Book Synopsis Modélisation de l'endommagement des structures en béton by : Khalil Haidar
Download or read book Modélisation de l'endommagement des structures en béton written by Khalil Haidar and published by . This book was released on 2002 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux effectués dans le cadre de la thèse porte sur l'étude des effets du changement microstructurel des matériaux sous sollicitations environnementales (non mécaniques) pour lesquels il importe de décrire les conséquences mécaniques en terme d'endommagement, de résistance et de propriétés d'usage des structures. L'objectif principal du travail est de contribuer à la quantification des effets de la microstructure sur les propriétés mécaniques des matériaux hétérogènes quasi-fragiles du génie civil (mortier, béton). Afin d'éviter la complexité liée à la cinétique de dégradation, nous menons notre étude sur un exemple académique : un matériau modèle à microstructure contrôlée, qui consiste en un mortier dans lequel nous incorporons, des inclusions de caractéristiques mécaniques faibles (billes de polystyrène). Dans un premier temps, nous avons constitué une base de données expérimentales de laboratoire, sur des corps d'épreuves différents : cylindres, poutres de différentes tailles pour étudier les effets d'échelle.Puis nous avons montré comment, à partir de la base de données, nous avons identifié les paramètres du modèle d'endommagement de Mazars (1984) en non local. Cette étude a permis de dégager les limites d'utilisation des modèles non locaux, où l'évolution de la longueur interne en fonction de l'état d'endommagement du matériau n'est pas prise en compte. Nous proposons des modifications à apporter au modèle de Mazars en non-local, afin de prendre en compte ces effets en se basant sur des arguments micro-mécaniques. Enfin, nous développons une technique numérique simplifiée de calcul multi-échelle des ouvrages fissurés, afin de surmonter les problèmes numériques liés à l'utilisation du modèle proposé dans le contexte d'une application réelle.
Book Synopsis Fracture Mechanics of Concrete Structures by : Z.P. Bazant
Download or read book Fracture Mechanics of Concrete Structures written by Z.P. Bazant and published by CRC Press. This book was released on 1992-05-14 with total page 1026 pages. Available in PDF, EPUB and Kindle. Book excerpt: This conference is the first in a series of conferences dedicated to Fracture Mechanics of Concrete Structures. Due to the recent explosion of interest in research on fracture in concrete, the conference has brought together the world's leading researchers in fracture of concrete and this book contains the proceedings.
Book Synopsis Contribution a l'étude numérique des modes localises de rupture dans les structures en béton de type poutres by : Meftah Fékri
Download or read book Contribution a l'étude numérique des modes localises de rupture dans les structures en béton de type poutres written by Meftah Fékri and published by . This book was released on 1997 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Damage and Fracture of Disordered Materials by : Dusan Krajcinovic
Download or read book Damage and Fracture of Disordered Materials written by Dusan Krajcinovic and published by Springer. This book was released on 2014-05-04 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal objective of this book is to relate the random distributions of defects and material strength on the microscopic scale with the deformation and residual strength of materials on the macroscopic scale. To reach this goal the authors considered experimental, analytical and computational models on atomic, microscopic and macroscopic scales.
Book Synopsis APPROCHE DU DIMENSIONNEMENT DES STRUCTURES EN BETON ARME PAR LE CALCUL A LA RUPTURE by : DANIEL.. AVERBUCH
Download or read book APPROCHE DU DIMENSIONNEMENT DES STRUCTURES EN BETON ARME PAR LE CALCUL A LA RUPTURE written by DANIEL.. AVERBUCH and published by . This book was released on 1996 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EST DESTINE A METTRE AU POINT UNE METHODE DE DIMENSIONNEMENT A L'ETAT LIMITE ULTIME DES STRUCTURES EN BETON ARME FONDEE SUR LE CALCUL A LA RUPTURE. LA METHODE PROPOSE UNE ANALYSE BIDIMENSIONNELLE, EN CONTRAINTE PLANE, DANS LAQUELLE LES ARMATURES SONT REPRESENTEES COMME DES MILIEUX CONTINUS UNIDIMENSIONNELS PLONGES DANS LE BETON CONSIDERE COMME UN MILIEU CONTINU BIDIMENSIONNEL (MODELISATION MIXTE). APPLIQUANT LA METHODE A LA PRISE EN COMPTE DE L'EFFORT TRANCHANT DANS LE DIMENSIONNEMENT DES POUTRES EN FLEXION, ON PROPOSE DE MODELISER LE RENFORCEMENT TRANSVERSAL DES POUTRES PAR LA PROCEDURE D'HOMOGENEISATION EN CALCUL A LA RUPTURE, TOUT EN CONSERVANT UNE MODELISATION DISCRETE DES ARMATURES LONGITUDINALES. AYANT CHOISI DES CRITERES DE RESISTANCE SIMPLIFIES POUR LE BETON ET LES ARMATURES, ON MONTRE ENSUITE LES LIMITES D'UNE APPROCHE UNIDIMENSIONNELLE DU DIMENSIONNEMENT DES POUTRES PAR LE CALCUL A LA RUPTURE. ON DEVELOPPE DONC UNE APPROCHE NUMERIQUE FONDEE SUR LA PROGRAMMATION LINEAIRE DANS LE CADRE DE LA METHODE DES ELEMENTS FINIS. CETTE DERNIERE APPROCHE PERMET AINSI D'EVALUER L'INFLUENCE DE L'EFFORT TRANCHANT SUR LA RESISTANCE DES POUTRES ET DE DETERMINER LE DOMAINE DE VALIDITE DE L'APPROCHE UNIDIMENSIONNELLE PROPOSEE PRECEDEMMENT. LA MODELISATION ET L'APPROCHE NUMERIQUE SONT FINALEMENT VALIDEES PAR COMPARAISON AVEC DES RESULTATS EXPERIMENTAUX.
Download or read book Micromechanics of Random Media written by and published by . This book was released on 1994 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials by : Jean-Marie Berthelot
Download or read book Composite Materials written by Jean-Marie Berthelot and published by Springer. This book was released on 2013-02-06 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical engineering, an engineering discipline borne of the needs of the in dustrial revolution, is once again asked to do its substantial share in the call for industrial renewal. The general call is urgent as we face profound issues of produc tivity and competitiveness that require engineering solutions, among others. The Mechanical Engineering Series features graduate texts and research monographs intended to address the need for information in contemporary areas of mechanical engineering. The series is conceived as a comprehensive one that covers a broad range of concentrations important to mechanical engineering graduate education and re search. We are fortunate to have a distinguished roster of consulting editors on the advisory board, each an expert in one of the areas of concentration. The names of the consulting editors are listed on the next page of this volume. The areas of concentration are applied mechanics, biomechanics, computational mechan ics, dynamic systems and control, energetics, mechanics of materials, processing, thermal science, and tribology.
Book Synopsis Discrete Element Method to Model 3D Continuous Materials by : Mohamed Jebahi
Download or read book Discrete Element Method to Model 3D Continuous Materials written by Mohamed Jebahi and published by John Wiley & Sons. This book was released on 2015-02-26 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complex behavior models (plasticity, cracks, visco elascticity) face some theoretical difficulties for the determination of the behavior law at the continuous scale. When homogenization fails to give the right behavior law, a solution is to simulate the material at a meso scale in order to simulate directly a set of discrete properties that are responsible of the macroscopic behavior. The discrete element model has been developed for granular material. The proposed set shows how this method is capable to solve the problem of complex behavior that are linked to discrete meso scale effects.
Book Synopsis Symmetric Galerkin Boundary Element Method by : Alok Sutradhar
Download or read book Symmetric Galerkin Boundary Element Method written by Alok Sutradhar and published by Springer Science & Business Media. This book was released on 2008-09-26 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Symmetric Galerkin Boundary Element Method presents an introduction as well as recent developments of this accurate, powerful, and versatile method. The formulation possesses the attractive feature of producing a symmetric coefficient matrix. In addition, the Galerkin approximation allows standard continuous elements to be used for evaluation of hypersingular integrals. FEATURES • Written in a form suitable for a graduate level textbook as well as a self-learning tutorial in the field. • Covers applications in two-dimensional and three-dimensional problems of potential theory and elasticity. Additional basic topics involve axisymmetry, multi-zone and interface formulations. More advanced topics include fluid flow (wave breaking over a sloping beach), non-homogeneous media, functionally graded materials (FGMs), anisotropic elasticity, error estimation, adaptivity, and fracture mechanics. • Presents integral equations as a basis for the formulation of general symmetric Galerkin boundary element methods and their corresponding numerical implementation. • Designed to convey effective unified procedures for the treatment of singular and hypersingular integrals that naturally arise in the method. Symbolic codes using Maple® for singular-type integrations are provided and discussed in detail. • The user-friendly adaptive computer code BEAN (Boundary Element ANalysis), fully written in Matlab®, is available as a companion to the text. The complete source code, including the graphical user-interface (GUI), can be downloaded from the web site http://www.ghpaulino.com/SGBEM_book. The source code can be used as the basis for building new applications, and should also function as an effective teaching tool. To facilitate the use of BEAN, a video tutorial and a library of practical examples are provided.
Book Synopsis High Performance Concrete by : Y. Malier
Download or read book High Performance Concrete written by Y. Malier and published by CRC Press. This book was released on 2018-05-08 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a thorough review of properties, durability and use of high performance concrete, derived from recent research and experience. This book contains contributions from the leading French, Canadian and Swiss researchers, designers and material specialists, translated into English for the first time.
Book Synopsis Mechanisms of Chemical Degradation of Cement-based Systems by : K.L. Scrivener
Download or read book Mechanisms of Chemical Degradation of Cement-based Systems written by K.L. Scrivener and published by CRC Press. This book was released on 1997-04-17 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deterioration of cement-based materials is a continuing problem, as it results in the substantial shortening of the lives of conventional concrete structures. The main costs result from poor performance and the need for early repair. With more advanced applications, where very long service lives are essential, such as the storage of nuclear waste, an understanding of the degradation processes in order to predict long term performance is very important. this book forms the proceedings of the latest Symposia at the Materials Research Society Autumn meeting in Boston.
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Book Synopsis Creep and Shrinkage of Concrete by : Z. P. Bažant
Download or read book Creep and Shrinkage of Concrete written by Z. P. Bažant and published by Spon Press. This book was released on 1993-01-01 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the proceedings of the 5th RILEM International Symposium, held in Barcelona in September 1993. The papers discuss creep and shrinkage of concrete, and should be of interest to cement and concrete technologists and researchers, as well as structural engineers.
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis A Course on Damage Mechanics by : Jean Lemaitre
Download or read book A Course on Damage Mechanics written by Jean Lemaitre and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new branch of science usually develops thus. Somebody publishes the basic ideas. Hesitatingly at first, then little by little, other original contributions appear, until a certain threshold is reached. Then, overview articles are printed, conferences are held, and a first mention is made in textbooks, until specialized monographs are written. Continuum darnage mechanics has reached that status now. To analyze or, if possible, to predict the failure of machine parts or other structures is one of the main goals of engineering science. Consequently fracture mechanics became one of its leading branches. It was based on the analysis of existing cracks. However, especially under conditions of cyclic loading, this might be too late to prevent a disaster. Therefore, the question regarding the precursory state, that is, the evolution of intemal darnage before macrocracks become visible, was then posed. One of the successful approaches to the problern was Weibull's theory which examined, in a statistical manner, the "weakest link" in the material volume under consideration. Unfortunately it proved too difficult mathematically to be applied to complicated parts or structures. Therefore it was highly appreciated by the scientific of material community when L. M. Kachanov published in 1958 a simple model darnage which subsequently could be extended to brittle elastic, plastic or viscous materials under all conditions of uniaxial or multiaxial, simple or cyclic loadings, so that it may be considered nearly universal.
Book Synopsis Faecal Sludge Management by : Linda Strande
Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
