To determine most exactly the carrying capacity of a structure or a structural element has always been a major concern to any design engineer. For safety sensitive structures this implies not only situations of normal service conditions but also states near to failure or post-critical states in order to better prevent accidents by appropriate design. Among the rational design tools available to engineers, for this purpose the so-called "direct methods", embracing in particular limit- and shakedown analysis, have always been particularly attractive due to the fact that they allow to determine in a constructive way directly the limit loads of a structure. This holds true for simple loading by proportionally applied mechanical and thermal loads, but also for the more complicated situation of variable loading even in the case when the loading history is not deterministically given.
The tremendous progress in computation over the last years has contributed very largely to the development of direct methods. They have left the realm of ad-hoc computing and can be used today for post-processing in combination with commercial design tools.
Far from being comprehensive, given this very active field of scientific research and development, the papers presented in this book give an account of some of the most advanced results achieved over the last years by leading scientists in the field. This way, the book is meant to help the practical engineer to choose the right tool for his safety analysis of critical structures and to stimulate researchers to enter this most interesting field, reaching from highly abstract concepts up to the essential questions of practical engineering.
Content Level » Research
Keywords » direct methods - mechanical and civil engineering - safety - structural design
TABLE OF CONTENTS
Large problems in numerical Limit Analysis: a decomposition approach, by F. Pastor, Z. Kammoun, E. Loute, J. Pastor and H. Smaoui; Gurson model for porous pressure sensitive materials, by J. Pastor and P. Thore; A Direct Method for the determination of effective strength domains for periodic elastic-plastic media, by S. Bourgeois, H. Magoariec and O. Debordes; Stochastic limit load analysis of elasto-plastic plane frames, by K. Marti; Limit load analysis of plane frames under stochastic uncertainty , by S. Zier and K. Marti; Static shakedown theorem for solids with temperature-dependent elastic modulus, by A. Oueslati and G. de Saxce; On shakedown of structures under variable loads with a kinematic non-linear and non-associated hardening rule, by C. Bouby, G. de Saxce and J.-B. Tritsch; Limit Analysis of orthotropic Laminates by Linear Matching Method, by P. Fuschi, A. A. Pisano, and O. Barrera
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This book aims to provide a unified methodology to derive models for fatigue life prediction. This includes S-N, e-N and crack propagation models. This book is unique in that it contemplates the three main fatigue approaches (stress-based, strain-based and fracture mechanics) from a novel and integrated point of view. As an alternative to the preferential attention paid to deterministic models based on the physical, phenomenological and empirical description of fatigue, their probabilistic nature is emphasized in this book, in which stochastic fatigue and crack growth models are presented.
After an introductory chapter in which an overview of the book is provided, the following chapters are devoted to derive models for the S-N fields for fixed and varying stress level, the e-N fields, the relations between the two, and an analysis of the size effect in fatigue problems. Next, crack grow models are derived based on fracture mechanics, statistical and common sense considerations, which lead to functional equations providing non-arbitrary models. Two different approaches are given, leading to two classes of models, the intersection class of which is derived through compatibility analysis. Then the compatibility of the S-N curves model and the crack growth model, which are two aspects of the same fatigue problem, are used to obtain a model which allows both approaches to be connected. Finally, the problem of selection damage measures is analyzed, and some damage measures are proposed as the most convenient, including the probability of failure and a normalized measure related to the percentile curve. This leads to very simple and useful damage accumulation models, which are illustrated with some examples.
The book ends with an appendix with a short description of some classical and some more recent fatigue models of those existing in the literature.
Related subjects » Materials - Mechanical Engineering - Mechanics - Physical & Information Science - Production & Process Engineering
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Anisotropic Elastic Plates find wide applications as structural elements in modern technology. The plates are considered to be subjected to not only inplane loads but also transverse loads. Plane problems, plate bending problems as well as stretching-bending coupling problems are all treated in this book. In addition to the introduction of the theory of anisotropic elasticity that includes two complex variable methods - Lekhnitiskii formalism and Stroh formalism- several important subjects are also discussed such as wedges, interfaces, cracks, holes, inclusions, contact problems, piezoelectric materials, thermal stresses and boundary element analysis.
Anisotropic Elastic Plates also collects over one hundred problems and solutions. This book is a useful resource for engineers and researchers in composite materials.
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Posted by: michenerpark - 01-04-2011, 03:19 AM - Forum: Archive
- No Replies
Anyone can downlaod this for me
Finite Element Modeling of Wrap-Around Gusset Plates in Tension by Bo Dowswell, Robert Whyte, Jim Davidson, and Fouad Fouad
Document type: Conference Proceeding Paper
Part of: 2006 Structural Engineering and Public Safety
Abstract: Gusset plates are used in steel buildings to connect bracing members to other structural members in the lateral force resisting system. Horizontal bracing is commonly used to resist lateral loads in industrial structures and in commercial buildings where floor and roof diaphragms cannot carry the loads. Wrap-around gusset plates are L-shaped plates that are used where an opening is required at the comer of the plate. This typically occurs at horizontal bracing where the gusset plate is cut out around a column. Finite element models were used to determine the behavior of wrap-around gusset plates. The plates were modeled using material and geometric nonlinearities. Five different gusset plates were modeled with geometry and material properties matching the experimental specimens of Dowswell. All of the models were loaded in tension. The loads from the finite element models were compared to the experimental loads.
Dear All
this book has been protected - you cann't edit , print , or copy this decuments
but it has V. good informations about precast , prestressed concrete bridges
so , I shared it , maybe any one can edit it to printable PDF
REGARDS
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This application-oriented book introduces the associations between contact mechanics and friction and with it offers a deeper understanding of tribology. It deals with the associated phenomena of contact, adhesion, capillary forces, friction, lubrication, and wear from one consistent viewpoint. The author goes into (1) methods of rough estimation of tribological quantities, (2) methods for analytical calculations which attempt to minimize the necessary complexity, (3) the crossover into numerical simulation methods. With these methods the author conveys a consistent view of tribological processes in various scales of magnitude (from nanotribology to earthquake research).
Also, system dynamic aspects of tribological systems, such as squeal and its supion as well as other types of instabilities and spatial patterns are investigated.
This book contains problems and worked solutions for individual chapters in which the reader can apply the theory to practical situations and deepen the understanding of the material.
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