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Design and Construction of Modern Steel Railway Bridges 2nd Edition by John F. Unsworth | PDF Free Download.
John F. Unsworth is a professional engineer (PEng). Since his completion of a bachelor of engineering degree in civil engineering and a master of engineering degree in structural engineering, he has held professional engineering and management positions concerning the track, bridge, and structures maintenance, design, and construction at the Canadian Pacific Railway.
He is a former president of the American Railway Engineering and Maintenance-of-way Association (AREMA) and has served as Chairman of the AREMA Committee 15—Steel Structures.
He currently serves as an emeritus member of the AREMA Committee 15. In addition, he is the current Chair of the Association of American Railroads (AAR) Bridge Research Advisory Group and is a former member of the National Academy of Sciences Transportation Research Board (TRB) Steel Bridges Committee.
He is also a member of the Canadian Society for Civil Engineering (CSCE), the American Society of Civil Engineers (ASCE), the American Institute of Steel Construction (AISC), and the International Association of Bridge and Structural Engineers (IABSE).
He is a licensed professional engineer in six Canadian provinces. He has written papers and presented them at AREMA Annual Technical Conferences, the International Conference on Arch Bridges, TRB Annual Meetings, CSCE Bridge Conferences, the ASCE Structures Congress, and the International Bridge Conference (IBC).
He has also contributed to the fifth edition of the Structural Steel Designer’s Handbook and the International Heavy Haul Association (IHHA) Best Practices books.
The first edition of this book provided nine chapters with a focus on the design of new steel superstructures for modern railway bridges referencing the recommended practices of Chapter 15— Steel Structures in the 2008 edition of the American Railway Engineering and Maintenance-of-way Association (AREMA) Manual for Railway Engineering (MRE).
This second edition updates the first edition by including changes precipitated by subsequent revisions to Chapter 15 of the MRE and the many valuable comments received from steel railway bridge design engineers, fabricators, students, academics, and researchers.
Grateful appreciation is due to all those who offered comments and suggestions and, in particular, to the many members of AREMA Committee 15—Steel Structures, whose experience and expertise, helped improve the technical content of this second edition.
A notable amendment to this second edition is the use of Système Internationale (SI) units in addition to US Customary or Imperial units throughout* the book.
Moreover, in this second edition, attention has been expanded to include two new chapters on the construction (fabrication and erection) of new steel superstructures for modern railway bridges. This second edition is divided into eleven chapters.
The first three chapters deliver introductory and general information as a foundation for the subsequent six chapters examining the detailed analysis and design, which precede two chapters concerning the fabrication and erection, of modern steel railway superstructures.
Chapter 1 is retained as a brief history of iron and steel railway bridges. The chapter concludes with the evolution and advancement of structural mechanics and design practice precipitated by steel railway bridge development.
A discussion regarding the manufacture of structural steel (steel making) has been included in Chapter 2 as a prelude to the material concerning the engineering properties and types of structural steel used in modern railway superstructure design and fabrication.
The information in Chapter 3 concerning the planning of steel railway bridges is enhanced with additional material regarding bridge scour investigation in accordance with AREMA (2015).
Added to the discussion about preliminary design is a brief introduction to probabilistic structural design in terms of modern steel railway superstructure design issues.
The next two chapters concerning the development of loads and structural analysis of modern steel railway bridge superstructures have been substantially updated.
The discussion of railway live loads in Chapter 4 is enhanced with a discussion of the historical development of modern freight train design live loads.
Material concerning the fatigue design load, which was included in Chapter 5 of the first edition, is now more appropriately included in Chapter 4 as it specifically relates to the modern freight train design live load.
The discussion of the freight train live load in Chapter 4 has been extensively revised using an approach originating with the modern vehicle–bridge interaction (VBI) dynamics concepts.
The VBI models are reduced to dynamic moving sprung mass, mass, and force problems to examine the theoretical foundations of railway live load impact.
The load combination table at the end of Chapter 4 has been updated based on thoughtful review by many members of the AREMA Committee 15.
Chapter 5 now also includes material concerning the lateral deflection of steel superstructures based on recent revisions to AREMA Chapter 15 that provide for better control of track geometry. The material concerning fatigue strength or resistance remains in Chapter 5.
Chapters 6–9 remain to outline the design of members and connections in accordance with AREMA (2015).
The post-buckling shear strength of plate girder web plates is not included in AREMA (2015) due to the intolerance of such behavior in railway superstructures.
Nevertheless, a brief introduction to plate girder web plate post-buckling strength is included in Chapter 7 of the second edition as information concerning the ultimate behavior of plate girder superstructures.
Chapter 9 includes updated information regarding the design shear strength of slip-critical connections. Other information in these four chapters has also been updated in accordance with the applicable revisions to AREMA Chapter 15 since the first edition of this book.
Chapters 10 and 11 are new to the second edition. Much of the subject matter considered in Chapters 2, 5, 6, 7, and 9 is affected by fabrication.
Consequently, and because steel superstructure design ultimately culminates in fabrication, Chapter 10 concerning the planning, processes, execution, and inspection of fabricated members and assemblies has been incorporated.
Since, steel superstructure erection logically trails fabrication and concludes the project, Chapter 11 outlining some typical practices of steel railway superstructure erection planning, equipment, engineering, and execution, follow Chapter 10 to conclude the book.
Appendices outlining the design of a ballasted through plate girder (BTPG) and a ballasted deck plate girder (BDPG) superstructure are included in the second edition to complement the material presented in the book.
An appendix has also been included as a précis of the common engineering unit conversions used in the book. Conversions between SI and US Customary or Imperial units and vice versa are presented.
This second edition remains as only one constituent of the information essential for the design and construction of safe and reliable modern steel railway superstructures.
Other sources of technical information are also necessary and, again, it is anticipated that, where such material is referenced in this book, proper attribution has been appropriately expressed.
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