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Vulnerabilite Des Dalles En Beton Sous Impact
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Book Synopsis Vulnérabilité des dalles en béton sous impact by : Xuan Dung Vu
Download or read book Vulnérabilité des dalles en béton sous impact written by Xuan Dung Vu and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le béton est un matériau dont le comportement est complexe, notamment dans le cas de sollicitations extrêmes. L'objectif de cette thèse est de caractériser expérimentalement le comportement du béton lorsque celui-ci est soumis à des sollicitations générées par un impact (compression confinée et traction dynamique) ; et de développer un outil numérique robuste permettant de modéliser son comportement de manière fiable. Dans la partie expérimentale, on a étudié des échantillons de béton provenant du centre de VTT (Centre de recherche technique en Finlande). Dans un premier temps, des essais statiques de compression triaxiale dont le confinement varie de 0 MPa (compression simple) à 600 MPa ont été réalisés. On observe que, sous l'effet de confinement la rigidité du béton devient plus importante à cause de la réduction de la porosité. Par conséquent, la résistance maximale au cisaillement du béton est augmentée. La présence d'eau joue un rôle important lorsque le degré de saturation est élevé et le béton est soumis à un fort confinement. Au delà d'un certain seuil de confinement, la résistance maximale au cisaillement diminue avec l'augmentation de la teneur en eau. L'eau influence également le comportement volumique du béton. Lorsque tous les pores libres du béton sont fermés sous l'effet de la compaction, la faible compressibilité de l'eau s'oppose à la déformation du béton, de sorte que le béton humide est moins déformé que le béton sec pour une même contrainte moyenne. Le deuxième volet du programme expérimental concerne des essais de traction dynamique à différentes vitesses de chargement, et à différents états d'humidité du béton. Les résultats obtenus montrent que la résistance en traction du béton C50 peut augmenter jusqu'à 5 fois par rapport à sa résistance statique pour une vitesse de déformation de l'ordre de 100 s-1. Dans la partie numérique, on s'intéresse à développer le modèle de comportement du béton PRM couplé (Pontiroli-Rouquand-Mazars) capable de prédire le comportement du béton sous impact. Ce modèle repose sur un couplage entre un modèle d'endommagement capable de décrire des mécanismes de dégradation et de fissuration du béton à faible confinement et un modèle de plasticité permettant de simuler le comportement du béton sous très fort confinement. L'identification du modèle a été réalisée avec les résultats des essais expérimentaux. L'amélioration du modèle, notamment sur le modèle de plasticité, porte sur trois points principaux : prise en compte de l'effet de la contrainte déviatoire dans le calcul de la contrainte moyenne ; de l'effet de l'eau avec la loi poro-mécanique au lieu de la loi des mélanges ; amélioration de la variable de couplage entre le modèle d'endommagment et le modèle élastoplastique avec une prise en compte de l'angle de Lode. Ces améliorations ont ensuite été validées par une confrontation des résultats numériques obtenus et des essais de type impact qui démontrent la fiabilité de la prédiction du modèle. Le modèle amélioré est capable de reproduire le comportement du béton sous différents trajets de chargement et à différents niveaux de confinement tout en tenant compte du degré de saturation du béton.
Book Synopsis Dalles en béton armé sous charge d'impact by : Taha Boulahdour
Download or read book Dalles en béton armé sous charge d'impact written by Taha Boulahdour and published by . This book was released on 1985 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Conservation of Stone Masonry by :
Download or read book Structural Conservation of Stone Masonry written by and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Divergent (Divergent Trilogy, Book 1) by : Veronica Roth
Download or read book Divergent (Divergent Trilogy, Book 1) written by Veronica Roth and published by HarperCollins UK. This book was released on 2013-11-07 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: The explosive debut by No. 1 New York Times bestselling author Veronica Roth. DIVERGENT – a major motion picture series.
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Book Synopsis The Art of Structures by : Aurelio Muttoni
Download or read book The Art of Structures written by Aurelio Muttoni and published by EPFL Press. This book was released on 2011-01-01 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the complete panorama of supporting structures and their function by describing how loads are sustained and transmitted to the ground. With a minimum of mathematics, the reader is guided through the analysis of some of the world's most famous designs and structures from a civil-engineering perspective. An intuitive approach is taken - the basics of equilibrium analysis are explained by visualizing the internal forces of specific structures with the aid of simple graphical tools. Ideal for anyone who needs an intuitive and practical approach to the design and appropriate sizing of load-bearing structures.
Book Synopsis Nature Based Strategies for Urban and Building Sustainability by : Gabriel Perez
Download or read book Nature Based Strategies for Urban and Building Sustainability written by Gabriel Perez and published by Butterworth-Heinemann. This book was released on 2018-02-14 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nature Based Strategies for Urban and Building Sustainability reviews the current state-of-the-art on the topic. In the introduction, the editors review the fundamental concepts of nature elements in the built environment, along with the strategies that are necessary for their inclusion in buildings and cities. Part One describes strategies for the urban environment, discussing urban ecosystems and ecosystem services, while Part Two covers strategies and technologies, including vertical greening systems, green roofs and green streets. Part Three covers the quantitative benefits, results, and issues and challenges, including energy performances and outdoor comfort, air quality improvement, acoustic performance, water management and biodiversity. Provides an overview of the different strategies available to integrate nature in the built environment Presents the current state of technology concerning systems and methodologies on how to incorporate nature in buildings and cities Features the latest research results on operation and ecosystem services Covers both established and new designs, including those still in the experimental stage
Download or read book Child Friendly Schools Manual written by and published by UNICEF. This book was released on 2009 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Child-Friendly Schools (CFS) Manual was developed during three-and-a-half years of continuous work, involving the United Nations Children's Fund education staff and specialists from partner agencies working on quality education. It benefits from fieldwork in 155 countries and territories, evaluations carried out by the Regional Offices and desk reviews conducted by headquarters in New York. The manual is a part of a total resource package that includes an e-learning package for capacity-building in the use of CFS models and a collection of field case studies to illustrate the state of the art in child-friendly schools in a variety of settings.
Book Synopsis How to Design Wastewater Systems for Local Conditions in Developing Countries by : David M. Robbins
Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.
Book Synopsis Design of Concrete Structures with Stress Fields by : Aurello Muttoni
Download or read book Design of Concrete Structures with Stress Fields written by Aurello Muttoni and published by Birkhäuser. This book was released on 2012-12-06 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: 17 2 STRESS FIELDS FOR SIMPLE STRUCTURES 2. 1 INTRODUCTION In this chapter the behavior and strength of simple structures made of rein forced or prestressed concrete is investigated with the aid of stress fields. In particular, the webs and flanges of beams, simple walls, brackets, bracing beams and joints of frames are investigated. By this means, the majority of design cases are already covered. In reality, all structural components are three-dimensional. Here, however, components are considered either directly as two-dimensional plate elements (i. e. the plane stress condition with no variation of stress over the thickness of the element) or they are subdivided into several plates. Since two-dimensional structural elements are statically redundant, it is pOSSible for a particular loading to be in equilibrium with many (theoretically an infinite number of) stress states. If the lower bound method of the theory of plasticity is employed, then an admissible stress field or any combination of such stress fields may be selected. In chapter 4 it is shown that this method is suitable for the design of reinforced concrete structures, and the consequence of the choice of the final structural system on the structural behavior is dealt with in detail. The first cases of the use of this method date back to Ritter [6] and Morsch [4], who already at the beginning of the century investigated the resultants of the internal stresses by means of truss models.
Book Synopsis Comptes Rendus : Congress Mondial de L'IASS Sur Les Enceintes Spatiales, Du 4 Au 9 Juillet 1976, Montreal, Canada by :
Download or read book Comptes Rendus : Congress Mondial de L'IASS Sur Les Enceintes Spatiales, Du 4 Au 9 Juillet 1976, Montreal, Canada written by and published by . This book was released on 1976 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Landscape Architecture in Canada by : Ron Williams
Download or read book Landscape Architecture in Canada written by Ron Williams and published by McGill Queens Univ. This book was released on 2014 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: A groundbreaking history of the development of designed landscapes in Canada.
Book Synopsis Reef Restoration Concepts & Guidelines by : Alasdair J. Edwards
Download or read book Reef Restoration Concepts & Guidelines written by Alasdair J. Edwards and published by . This book was released on 2007 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oedipus at Thebes written by Bernard Knox and published by Yale University Press. This book was released on 1998-01-01 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the way in which Sophocles' play "Oedipus Tyrannus" and its hero, Oedipus, King of Thebes, were probably received in their own time and place, and relates this to twentieth-century receptions and interpretations, including those of Sigmund Freud.
Book Synopsis Accidental Wilderness by : Walter H. Kehm
Download or read book Accidental Wilderness written by Walter H. Kehm and published by Aevo Utp. This book was released on 2020-10-15 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accidental Wilderness showcases how the removal of city rubble and its displacement can result in new urban parklands with significant ecological importance for the health of the city and its residents.
Book Synopsis Petroglyphs of South Kazakhstan by : Renato Sala
Download or read book Petroglyphs of South Kazakhstan written by Renato Sala and published by . This book was released on 2005 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
