External Tendons For Bridges
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| Author | : FIB – International Federation for Structural Concrete |
| Publisher | : FIB - International Federation for Structural Concrete |
| Total Pages | : 118 |
| Release | : 2020-12-01 |
| Genre | : Technology & Engineering |
| ISBN | : 2883941459 |
The concept of post-tensioning has been recognized for over a century. Interestingly, early developments started with external tendons, but failed to be recognized as a major construction technique for two main reasons: - Low tensile performance of early steels in combination with a poor knowledge of concrete creep and shrinkage properties, - Lack of a durable corrosion protection. With the technological progress, external tendons became increasingly popular in the 1980’s, as a post-tensioning method enabling inspection and, if necessary, replacement of tendons without demolition of structural members. Towards the end of the last century, more than 50 bridges have been built with external tendons, first in France and soon gaining traction in other countries. FIP published a state-of the-art report in May 1996 to provide a review of the application of external tendons, describing specific material problems and methods for dealing with them. 25 years have passed and, while the engineering principles covered by the FIP report remain unchanged, the context has evolved: - External tendons and construction methods have kept evolving with better materials, ever longer spans, and tighter schedules. - Normalization frame in Europe changed, Severe durability issues have occurred in some countries from which the industry can extract good knowledge of the causes and how to avoid similar problems in the future. This new fib bulletin has been prepared with the aim to reflect the current state of the art and encompass the knowledge amassed in the last quarter of century with chapters covering from the design and approval of systems and materials to installation, quality control and monitoring. The last chapter is a compilation of structures worldwide covering all sorts of materials, typologies and construction methods, which might be a source of inspiration for owners and designers alike.
| Author | : fib Fédération internationale du béton |
| Publisher | : fib Fédération internationale du béton |
| Total Pages | : 196 |
| Release | : 2000-01-01 |
| Genre | : Technology & Engineering |
| ISBN | : 9782883940499 |
Addressed to designers and even more so to owners and project managers, this part is meant as a guide to an efficient selection of designers and contractors, and to the preparation of fair contracts providing high quality at reasonable cost. Clearly, a good design must be paid for at its real cost; economising on the design cost can be extremely counterproductive for the owner when considering the final whole-life cost of the project. In addition, it was considered very important to address the designer’s responsibilities and relations with other participants in large projects, and finally design philosophy itself. Part 2 – Design and construction aspects This more technical part is mainly addressed to bridge designers and devoted to a systematic analysis of structural and constructional bridge concepts. Considering the importance of erection techniques in the development of bridge design, this second part of the guide starts by a description of the different construction methods, their advantages and draw-backs, their particularities and, of course, by defining the domain of their most efficient applications. Another main chapter is devoted to the proper design of cross-sections. And finally, a third main chapter deals in detail with the influence of construction techniques on design.
| Author | : Post-Tensioning Institute |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2023 |
| Genre | : Post-tensioned prestressed concrete construction |
| ISBN | : 9781931085588 |
| Author | : Edward G. Nawy |
| Publisher | : CRC Press |
| Total Pages | : 1586 |
| Release | : 2008-06-24 |
| Genre | : Technology & Engineering |
| ISBN | : 1420007653 |
The Concrete Construction Engineering Handbook, Second Edition provides in depth coverage of concrete construction engineering and technology. It features state-of-the-art discussions on what design engineers and constructors need to know about concrete, focusing on - The latest advances in engineered concrete materials Reinforced concrete construction Specialized construction techniques Design recommendations for high performance With the newly revised edition of this essential handbook, designers, constructors, educators, and field personnel will learn how to produce the best and most durably engineered constructed facilities.
| Author | : K.M. Mahmoud |
| Publisher | : CRC Press |
| Total Pages | : 396 |
| Release | : 2003-01-01 |
| Genre | : Technology & Engineering |
| ISBN | : 9780203017876 |
This book contains a selected number of papers that were presented at the Second New York City Bridge Conference organized by the Bridge Engineering Association. It represents the state-of-the-art papers from different countries on a wide spectrum of topics in bridge engineering.
| Author | : Nigel R. Hewson |
| Publisher | : Thomas Telford |
| Total Pages | : 412 |
| Release | : 2003 |
| Genre | : Technology & Engineering |
| ISBN | : 9780727732231 |
Prestressed concrete decks are commonly used for bridges with spans between 25m and 450m and provide economic, durable and aesthetic solutions in most situations where bridges are needed. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Extensively illustrated throughout, this invaluable book brings together all aspects of designing prestressed concrete bridge decks into one comprehensive volume. The book clearly explains the principles behind both the design and construction of prestressed concrete bridges, illustrating the interaction between the two. It covers all the different types of deck arrangement and the construction techniques used, ranging from in-situ slabs and precast beams; segmental construction and launched bridges; and cable-stayed structures. Included throughout the book are many examples of the different types of prestressed concrete decks used, with the design aspects of each discussed along with the general analysis and design process. Detailed descriptions of the prestressing components and systems used are also included. Prestressed Concrete Bridges is an essential reference book for both the experienced engineer and graduate who want to learn more about the subject.
| Author | : FIB – International Federation for Structural Concrete |
| Publisher | : FIB - Féd. Int. du Béton |
| Total Pages | : 817 |
| Release | : 2002-01-01 |
| Genre | : Technology & Engineering |
| ISBN | : |
| Author | : Jens Tandler |
| Publisher | : diplom.de |
| Total Pages | : 153 |
| Release | : 2014-04-11 |
| Genre | : Technology & Engineering |
| ISBN | : 3836623331 |
Inhaltsangabe:Introduction: This dissertation is an investigation into the behaviour of externally prestressed structures, focusing on bridge box girders, at the ultimate limit state. The main objective is the ductility and the tendon stress increase up to failure of externally prestressed structures. Their behaviour will be compared to internally prestressed structures. The dissertation may have valuable information for the first stages of the design process for medium span bridges as the study is concerned about the overall safety and efficiency of prestressed concrete bridges by the means of ductility. The aim is also to provide information about the tendon stress at failure, which is required for the detailed design. Inhaltsverzeichnis:Inhaltsverzeichnis: AcknowledgementsVIII NotationIX 1.Introduction1 1.1Definitions1 1.2Significance of this study3 1.3Scope of the project5 1.4Historical overview and typical characteristics of external prestressing6 1.5Further structural applications of external prestressing9 2.Behaviour of externally prestressed structures10 2.1Tendon layout considerations10 2.2Behaviour at serviceability stage12 2.3Fatigue problems14 2.4Behaviour at ultimate limit stage14 2.4.1Influence of tendon slip on the ultimate limit state18 2.4.2Influence of the arrangement of the deviators on the behaviour at ultimate limit state19 2.4.3Influence of simply support and continuous support on the ultimate limit state20 2.4.4Precast segmental and monolithic bridges21 3.Collapse analysis23 3.1Investigated bridge types and their differences23 3.2Original bridge data28 3.3Simplified bridge data as basis for the calculations30 3.4FE Calculation32 3.4.1Technical aspects33 3.4.2General approach34 3.4.3Geometric model39 3.4.4Element specifications40 3.4.5Constitutive models45 3.4.6Ordinary reinforcement59 3.4.7Prestress60 3.4.8Material and geometric non-linearity63 3.4.9Kinematic constraints66 3.4.10Discrete crack propagation analysis of the precast segmental type with gap elements68 3.4.11Summary of the dividing features of the different structure types for the FE analysis72 4.Results73 4.1Load deflection behaviour73 4.2Tendon stress increase up to failure76 4.3Other results78 5.Discussion of the results85 5.1Interpretation of the results85 5.2Discussion of the exactness of the FE calculations by comparing to the full scale test89 5.3Comparison to other FE calculations and test results93 6.Conclusion and [...]
| Author | : |
| Publisher | : Thomas Telford |
| Total Pages | : 252 |
| Release | : |
| Genre | : |
| ISBN | : 9780727732828 |
| Author | : D.A. Hordijk |
| Publisher | : Springer |
| Total Pages | : 2926 |
| Release | : 2017-06-08 |
| Genre | : Technology & Engineering |
| ISBN | : 3319594710 |
This book contains the proceedings of the fib Symposium “High Tech Concrete: Where Technology and Engineering Meet”, that was held in Maastricht, The Netherlands, in June 2017. This annual symposium was organised by the Dutch Concrete Association and the Belgian Concrete Association. Topics addressed include: materials technology, modelling, testing and design, special loadings, safety, reliability and codes, existing concrete structures, durability and life time, sustainability, innovative building concepts, challenging projects and historic concrete, amongst others. The fib (International Federation for Structural Concrete) is a not-for-profit association committed to advancing the technical, economic, aesthetic and environmental performance of concrete structures worldwide.
