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Author: Jérôme St-Michel
Publisher:
ISBN:
Category :
Languages : fr
Pages : 121
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Author: Jérôme St-Michel
Publisher:
ISBN:
Category :
Languages : fr
Pages : 121
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Author: Ngoc Thanh-Hà Nguyen
Publisher:
ISBN:
Category :
Languages : fr
Pages : 294
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L'objectif de la thèse est la modélisation du comportement des ouvrages dans les sols mous, du type de ceux rencontrée en Asie du Sud-Est ou dans les grands fonds marins. Il s'agit d'un travail essentiellement numérique, qui comporte également une partie expérimentale significative concernant la détermination du comportement mécanique de ces argiles très molles. On a abordé l'étude tridimensionnelle des groupes de pieux, puis celle des fondations mixtes radier-pieux et enfin la solution alternative du renforcement des sols mous par colonnes ballastées. On a précisé les interactions entre les différents pieux (ou colonnes) des groupes et celles entre radier, sol et pieux. Les effets de l' entraxe et de la longueur des pieux (ou des colonnes) sur l'efficacité des groupes ou des fondations mixtes ont été également considérés. On a mis particulièrement en évidence l'effet négatif du radier dans la partie supérieure des pieux ainsi que la distribution non-uniforme du frottement latéral autour de ceux-ci. En ce qui concerne les colonnes ballastées, on montre le rôle essentiel de la prise en compte de leur mise en place dans la simulation numérique, et qu'une expansion de type pressiométrique des colonnes permet de retrouver les facteurs de réduction des tassements observés sur site.
Author:
Publisher: Ed. Techniques Ingénieur
ISBN:
Category :
Languages : fr
Pages : 46
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Author: SAMIR.. BELKHIR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 199
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LES FONDATIONS PROFONDES SUR PIEUX, TRES LARGEMENT UTILISEES CONNAISSENT UN DEVELOPPEMENT CROISSANT. LES PRINCIPALES RAISONS SONT LA QUALITE DE PLUS EN PLUS MEDIOCRE DES TERRAINS LAISSES AUX CONSTRUCTEURS, LES DIMENSIONS IMPORTANTES DES OUVRAGES MARITIMES ET OFFSHORE, LES INNOVATIONS TECHNOLOGIQUES DANS LA REALISATION DES PIEUX ET ENFIN, LES PROGRES REALISES DANS LES METHODES DE DIMENSIONNEMENT. LA PLUPART DES TRAVAUX ENTREPRIS DANS CE DOMAINE, IGNORENT LA CONTINUITE ENTRE LES COUCHES ET NE PREND PAS EN COMPTE LE CISAILLEMENT DU SOL. CECI NOUS A AMENE A ENTREPRENDRE UNE ETUDE PAR MODELISATION NUMERIQUE QUI PERMET DE PRENDRE EN COMPTE DANS LES CALCULS D'UN PIEU CHARGE LATERALEMENT, LE CISAILLEMENT DE SOL. DANS CET OBJECTIF, UN CODE DE CALCUL EST DEVELOPPE, NOMME CAPELA. CE CODE DE CALCUL CAPELA PERMET L'ETUDE DU COMPORTEMENT DE PIEUX CHARGES LATERALEMENT AVEC UNE POSITION QUELCONQUE DU POINT D'APPLICATION DE LA CHARGE LE LONG DU PIEU. D'AUTRE PART, LE CODE DU CALCUL CAPELA PERMET D'INTRODUIRE DIFFERENTS TYPE DE SOL AVEC UN LARGE CHOIX DE COURBE DE REACTION. PAR AILLEURS, CE CODE DE CALCUL EST DOTE D'UN MENU D'INTRODUCTION DE DONNEES ELEGANT ET FACILE D'UTILISATION. UNE ETUDE COMPARATIVE DES RESULTATS DE CALCUL DE PIEUX CHARGES LATERALEMENT OBTENUS PAR CAPELA, PILATE ET DES ESSAIS SUR DES MODELES REDUITS CENTRIFUGES, EST EFFECTUEE. CETTE ETUDE A DOUBLE OBJECTIF, D'ABORD, LA VALIDATION DU CODE DE CALCUL CAPELA, D'AUTRE PART L'ETUDE DE L'INFLUENCE DE LA PRISE EN COMPTE DE L'EFFET DU CISAILLEMENT DU SOL SUR LE COMPORTEMENT DES PIEUX. CES CONFRONTATIONS ENTRE LES RESULTATS OBTENUS EN CENTRIFUGEUSE ET CEUX OBTENUS PAR CAPELA, ONT PERMIS DE VALIDER CE DERNIER, POUR PLUSIEURS TYPES D'ENVIRONNEMENT. CES EXEMPLES DE CONFRONTATION AVEC DES ESSAIS SUR MODELES REDUITS CENTRIFUGES, PERMETTENT D'AVOIR UNE ESTIMATION CONCRETE ET GLOBALE DE L'EFFET DU CISAILLEMENT DU SOL. LES RESULTATS OBTENUS MONTRENT NETTEMENT CET EFFET. AINSI, L'INFLUENCE DU CISAILLEMENT SUR LE COMPORTEMENT D'UN PIEU CHARGE LATERALEMENT EST EFFECTIVEMENT MISE EN EVIDENCE. CECI PERMET PAR CONSEQUENT, EN TENANT COMPTE DE L'EFFET DE CISAILLEMENT, DE REDUIRE LE DIMENSIONNEMENT DES PIEUX.
Author: Howard A. Perko
Publisher: John Wiley & Sons
ISBN: 0470404795
Category : Technology & Engineering
Languages : en
Pages : 529
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Book Description
An unbiased, comprehensive review of helical pile technology and applications Helical piles have risen from being merely an interesting alternative for special cases to a frequently requested, more widely accepted deep foundation adopted into the 2009 International Building Code. The first alternative to manufacturer-produced manuals, Howard Perko's Helical Piles: A Practical Guide to Design and Installation answers the industry's need for an unbiased and universally applicable text dedicated to the design and installation of helical piles, helical piers, screw piles, and torque anchors. Fully compliant with ICC-Evaluation Services, Inc., Acceptance Criteria for Helical Foundation Systems and Devices (AC358), this comprehensive reference guides construction professionals to manufactured helical pile systems and technology, providing objective insights into the benefits of helical pile foundations over driven or cast foundation systems, and recommending applications where appropriate. After introducing the reader to the basic features, terminology, history, and modern applications of helical pile technology, chapters discuss: Installation and basic geotechnics Bearing and pullout capacity Capacity verification through torque Axial load testing, reliability, and sizing Expansive soil and lateral load resistance Corrosion and life expectancy Foundation, earth retention, and underpinning systems Foundation economics Select proprietary systems IBC and NYC Building codes Covering such issues of concern as environmental sustainability, Helical Piles provides contractors and engineers as well as students in civil engineering with a practical, real-world guide to the design and installation of helical piles.
Author: Leslie Rainer
Publisher: Getty Publications
ISBN: 1606060430
Category : Architecture
Languages : fr
Pages : 438
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Book Description
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.
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: Jean-François Semblat
Publisher: Iuss Press
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 510
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Author: G. Duvant
Publisher: Springer Science & Business Media
ISBN: 3642661653
Category : Mathematics
Languages : en
Pages : 415
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Book Description
1. We begin by giving a simple example of a partial differential inequality that occurs in an elementary physics problem. We consider a fluid with pressure u(x, t) at the point x at the instant t that 3 occupies a region Q oflR bounded by a membrane r of negligible thickness that, however, is semi-permeable, i. e., a membrane that permits the fluid to enter Q freely but that prevents all outflow of fluid. One can prove then (cf. the details in Chapter 1, Section 2.2.1) that au (aZu azu aZu) (1) in Q, t>o, -a - du = g du = -a z + -a z + -a z t Xl X X3 z l g a given function, with boundary conditions in the form of inequalities u(X,t»o => au(x,t)/an=O, XEr, (2) u(x,t)=o => au(x,t)/an?:O, XEr, to which is added the initial condition (3) u(x,O)=uo(x). We note that conditions (2) are non linear; they imply that, at each fixed instant t, there exist on r two regions r~ and n where u(x, t) =0 and au (x, t)/an = 0, respectively. These regions are not prescribed; thus we deal with a "free boundary" problem.
Author: Alain Puech
Publisher: John Wiley & Sons
ISBN: 1119468825
Category : Science
Languages : en
Pages : 459
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Book Description
Recent developments in the fields of energy, transport and industrial engineering have led to the emergence of new types of structures and infrastructures subject to variable stresses, for which the usual methods for designing pile foundations are now inadequate. The recommendations presented in this book will help to partly fill this technical gap by proposing a methodological approach and calculation methods to take account of the effects of cyclic loads in the design of foundations on piles. These are based on both laboratory and full scale experiments, and on modeling carried out within the framework of the national SOLCYP project.
