Theory Of Bridge Aerodynamics
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| Author | : Einar Strømmen |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 316 |
| Release | : 2010-07-15 |
| Genre | : Science |
| ISBN | : 3642136605 |
In this second edition a new chapter has been added covering the buffeting theory in a finite element format. The motivation for this has been that a finite element format is becoming more and more dominant in all areas of structural mechanics. It is streamlined for computer programming, and it facilitates the use of general purpose routines that are applicable in several types of structural engineering problems. In this book the finite element formulation of the problem of dynamic response calculations follows the general principle of virtual work, a general principle which may be found in many other text books. While the buffeting wind load itself has with no trouble been included in a finite element format, the main challenge has been to obtain a consistent formulation that includes all the relevant motion induced forces. This has been important, because, while many structures (e.g. long-span suspension bridges) may suffer greatly and become unstable at high wind velocities, the same structures may also benefit from these effects at the design wind velocity. It is well known that motion induced forces will change the stiffness and damping properties of the combined structure and flow system. If calculations are performed for a suitably close set of increasing mean wind velocities and the changing mechanical properties (stiffness and damping) are updated from one velocity to the next, then the response of the system may be followed up to wind velocities close to the stability limit, i.e. up to response values that are perceived as unduly large. Finite element calculations may be performed in time domain, in frequency domain or converted into a modal format. All these options have been included. Pursuing a time domain solution strategy requires the use of the so-called indicial functions. The theory behind such a formulation is also covered, and the determination of these functions from aerodynamic derivatives has been included in a separate appendix.
| Author | : Helmut Wenzel |
| Publisher | : John Wiley & Sons |
| Total Pages | : 652 |
| Release | : 2008-11-20 |
| Genre | : Technology & Engineering |
| ISBN | : 0470740183 |
Health Monitoring of Bridges prepares the bridge engineering community for the exciting new technological developments happening in the industry, offering the benefit of much research carried out in the aerospace and other industrial sectors and discussing the latest methodologies available for the management of bridge stock. Health Monitoring of Bridges: Includes chapters on the hardware used in health monitoring, methodologies, applications of these methodologies (materials, methods, systems and functions), decision support systems, damage detection systems and the rating of bridges and methods of risk assessment. Covers both passive and active monitoring approaches. Offers directly applicable methods and as well as prolific examples, applications and references. Is authored by a world leader in the development of health monitoring systems. Includes free software that can be downloaded from http://www.samco.org/ and provides the raw data of benchmark projects and the key results achieved. This book provides a comprehensive guide to all aspects of the structural health monitoring of bridges for engineers involved in all stages from concept design to maintenance. It will also appeal to researchers and academics within the civil engineering and structural health monitoring communities.
| Author | : Niels J. Gimsing |
| Publisher | : John Wiley & Sons |
| Total Pages | : 760 |
| Release | : 2011-12-30 |
| Genre | : Technology & Engineering |
| ISBN | : 1119951879 |
Fourteen years on from its last edition, Cable Supported Bridges: Concept and Design, Third Edition, has been significantly updated with new material and brand new imagery throughout. Since the appearance of the second edition, the focus on the dynamic response of cable supported bridges has increased, and this development is recognised with two new chapters, covering bridge aerodynamics and other dynamic topics such as pedestrian-induced vibrations and bridge monitoring. This book concentrates on the synthesis of cable supported bridges, suspension as well as cable stayed, covering both design and construction aspects. The emphasis is on the conceptual design phase where the main features of the bridge will be determined. Based on comparative analyses with relatively simple mathematical expressions, the different structural forms are quantified and preliminary optimization demonstrated. This provides a first estimate on dimensions of the main load carrying elements to give in an initial input for mathematical computer models used in the detailed design phase. Key features: Describes evolution and trends within the design and construction of cable supported bridges Describes the response of structures to dynamic actions that have attracted growing attention in recent years Highlights features of the different structural components and their interaction in the entire structural system Presents simple mathematical expressions to give a first estimate on dimensions of the load carrying elements to be used in an initial computer input This comprehensive coverage of the design and construction of cable supported bridges provides an invaluable, tried and tested resource for academics and engineers.
| Author | : Allan Larsen |
| Publisher | : Routledge |
| Total Pages | : 320 |
| Release | : 2017-10-19 |
| Genre | : Technology & Engineering |
| ISBN | : 1351468057 |
As bridges spans get longer, lighter and more slender, aerodynamic loads become a matter of serious study. This volume of proceedings reflect the co-operation between civil and mechanical engineering and meteorology in this field.
| Author | : J. A. Jurado |
| Publisher | : WIT Press |
| Total Pages | : 369 |
| Release | : 2011 |
| Genre | : Technology & Engineering |
| ISBN | : 184564056X |
This book is dedicated to the study of an aeroelastic phenomenon of cable supported long span bridges known as flutter, and proposes very innovative design methodologies, such as sensitivity analysis and optimization techniques, already utilized successfully in automobile and aerospace industries. The topic of long-span suspension and cable-stayed bridges is currently of great importance. These types of bridge pose great technical difficulties due to their slenderness and often great dimension. Therefore, these bridges tend to have problems caused by natural forces such as wind loads, some of which we have witnessed in our history, and we are currently seeing a very high incidence of bridge construction to overcome geographical obstacles such as bays, straits, or great estuaries. Therefore, it seems very appropriate to write a book showing the current capability of analysis and design, when up until now, the information could only be found partially in technical articles. This book will be useful for bridge design engineers as well as researchers working in the field. This book only requires previous knowledge of structural finite element models and dynamics, and it is advisable to have some previous knowledge in bridge engineering. Nevertheless, this book is very self-contained in such a way that all the information necessary to understand the theoretical developments is presented without the need of additional bibliography.
| Author | : Randal W. Beard |
| Publisher | : Princeton University Press |
| Total Pages | : 317 |
| Release | : 2012-02-26 |
| Genre | : Technology & Engineering |
| ISBN | : 1400840600 |
Autonomous unmanned air vehicles (UAVs) are critical to current and future military, civil, and commercial operations. Despite their importance, no previous textbook has accessibly introduced UAVs to students in the engineering, computer, and science disciplines--until now. Small Unmanned Aircraft provides a concise but comprehensive description of the key concepts and technologies underlying the dynamics, control, and guidance of fixed-wing unmanned aircraft, and enables all students with an introductory-level background in controls or robotics to enter this exciting and important area. The authors explore the essential underlying physics and sensors of UAV problems, including low-level autopilot for stability and higher-level autopilot functions of path planning. The textbook leads the student from rigid-body dynamics through aerodynamics, stability augmentation, and state estimation using onboard sensors, to maneuvering through obstacles. To facilitate understanding, the authors have replaced traditional homework assignments with a simulation project using the MATLAB/Simulink environment. Students begin by modeling rigid-body dynamics, then add aerodynamics and sensor models. They develop low-level autopilot code, extended Kalman filters for state estimation, path-following routines, and high-level path-planning algorithms. The final chapter of the book focuses on UAV guidance using machine vision. Designed for advanced undergraduate or graduate students in engineering or the sciences, this book offers a bridge to the aerodynamics and control of UAV flight.
| Author | : Petros P. Xanthakos |
| Publisher | : John Wiley & Sons |
| Total Pages | : 1466 |
| Release | : 1994 |
| Genre | : Technology & Engineering |
| ISBN | : 9780471570974 |
Indeed, this essential working reference for practicing civil engineers uniquely reflects today's gradual transition from allowable stress design to Load and Resistance Factor Design by presenting LRFD specifications - developed from research requested by AASH-TO and initiated by the NCHRP - which spell out new provisions in areas ranging from load models and load factors to bridge substructure elements and foundations.
| Author | : T Yomi Obidi |
| Publisher | : SAE International |
| Total Pages | : 290 |
| Release | : 2014-03-20 |
| Genre | : Technology & Engineering |
| ISBN | : 076808105X |
This book provides an introduction to ground vehicle aerodynamics and methodically guides the reader through the various aspects of the subject. Those needing specific information or a refresher can easily jump to the material of interest. There is a particular emphasis on various vehicle types (passenger cars, trucks, trains, motorcycles, race cars, etc.). However, the book is focused on cars and trucks, which are the most common vehicles in the speed range in which the study of ground vehicle aerodynamics is beneficial. Readers will gain a fundamental understanding of the topic, which will help them design vehicles that have improved aerodynamics; this will lead to better fuel efficiency, improved performance, and increased passenger comfort. The author’s basic approach to the presentation of the material is complemented with review questions, application questions, exercises, and suggested projects at the end of most of the chapters, which helps the reader apply the information presented, either in the classroom or for self-study. Aside from offering a solid understanding of ground vehicle aerodynamics, the book also offers more thorough study of several key topics. One such topic is car-truck interaction, when one vehicle (usually the smaller one) is overtaking the other. There is a direct and instant benefit in terms of safety on the highway from understanding the forces at play when one vehicle passes the other in the same direction and sense. Chapters examine: • Drag • Noise and vehicle soiling • Wind tunnels and road/track testing • Numerical methods • Vehicle stability and control • Vehicle sectional design • Large vehicles: trucks, trailers, buses, trains • Severe service and off-road vehicles • Race cars and convertibles • Motorcycles • Concept vehicles
| Author | : Allan Larsen |
| Publisher | : Taylor & Francis |
| Total Pages | : 357 |
| Release | : 1998 |
| Genre | : Aerodynamik |
| ISBN | : 9789054109617 |
Proceedings of the May 1998 Symposium. Twenty-five contributions present state-of-the-art and future development trends in optimization, bridge aerodynamics and ship collision analysis, and operation and maintenance. Topics include probabilistic methods, aeroelastic analysis, cable dynamics, cross wind on vehicles, and numerical methods. Contains an author index but no subject index. Annotation copyrighted by Book News, Inc., Portland, OR
| Author | : Richard Scott |
| Publisher | : Amer Society of Civil Engineers |
| Total Pages | : 392 |
| Release | : 2001 |
| Genre | : Technology & Engineering |
| ISBN | : 9780784405420 |
In the Wake of Tacoma is the first comprehensive treatment of the changes that the 1940 collapse of the first Tacoma Narrows Bridge has imposed on the design of suspension bridges. Written as a historical narrative, this heavily illustrated book describes design trends before the collapse, the collapse itself, and the investigations to determine its cause. The book then examines subsequent aerodynamic and other design developments and their application in suspension bridges worldwide in the decades following the collapse. In the Wake of Tacoma is a comprehensive reference work on suspension bridges in general, examining virtually every suspension bridge of note built in the past sixty years and highlighting overall development of the state of the art today. It goes beyond the major, well-known bridges to examine many small and mid-span suspension bridges worldwide that have contributed significantly to the modern development of the form. Also covered are the engineering debates and engineers involved; discussions of bridges under construction and under design; and new design concepts and materials to conquer the huge distances envisaged for such crossings as the Messina and Gibraltar straits. Presented in easy-to-understand, nontechnical language, this book, which received the 2006 Publication Award from the Japan Association for Wind Engineering, should appeal to both engineers and nonengineers with an interest in bridges and engineering in general. About the Author Richard Scott is a waterway heritage planner for Parks Canada, where he is currently responsible for palnning along the Trent-Severn waterway. He is also the editor of History of the Modern Suspension Bridge: Solving the Dilemma between Economy and Stiffness (ASCE Press, 2010). Product Reviews ...An outstanding history of suspension bridges focusing on post-Tacoma spans... In the Wake of Tacoma is extremely visual and written in a style that makes it accessible, exciting and interesting to both engineers and the general public. It is a masterful study- well researched, written, and illustrated. --Eric DeLony, Chief, Historic American Engineering Record, National Park Service
