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Design of Highway Bridges An LRFD Approach
Preface to Highway Bridges PDF Ebook
This e book has the identical intent as the primary version and is written for seniorlevel undergraduate or first-year graduate college students in civil engineering.
It is usually written for training civil engineers who’ve an curiosity within the design of freeway bridges.
The target is to offer the reader a significant introduction to the design of medium- and short-span girder bridges.
This goal is achieved by offering basic idea and habits, background on the event of the specs, procedures for design, and design examples.
This e book is predicated on the American Affiliation of State Highway and Transportation Officers (AASHTO) LRFD Bridge Design Specs, Third Version, and Customary U.S. models are used all through.
The overall method is to current idea and habits upon which a provision of the specs is predicated, adopted by acceptable procedures, both introduced explicitly or in examples.
The examples deal with the procedures concerned for a selected structural materials and provides reference to the suitable article within the specs.
It’s, due to this fact, urged that the reader have obtainable a duplicate of the newest version of the AASHTO LRFD Bridge Design Specs.
The scope is proscribed to an intensive therapy of medium- and short-span girder bridges with a most span size of about 250 ft.
These bridge buildings comprise roughly 80% of the U.S. bridge stock and are the most typical bridges designed by practitioners.
Their design illustrates the fundamental ideas used for the design of longer spans. Construction sorts included on this e book are constructed of concrete and metal.
Concrete cast-inplace slab, T-beam, and box-girder bridges and precast–prestressed techniques are thought-about. Rolled metal beam and plate girder techniques which are composite and noncomposite are included.
Civil engineers are recognized as main customers of this e book as a result of their formal training contains matters necessary to a freeway bridge designer.
These matters embody research in transportation techniques, hydrodynamics of streams and channels, geotechnical engineering, development administration, environmental engineering, structural evaluation and design,
life-cycle costing, materials testing, high quality management, skilled and authorized issues, and the folks points related to public development tasks.
This reference to civil engineers just isn’t meant to exclude others from using this e book. Nonetheless, the reader is anticipated to have one undergraduate course in structural design for every structural materials thought-about.
For instance, if solely the design of metal bridges is of curiosity, then the reader ought to have at the least one course in structural evaluation and one course in structural metal design.
Chapter 1 introduces the subject of bridge engineering with a quick historical past of bridge constructing and the event of bridge specs in the USA.
Added to the second version is an expanded therapy of bridge failure case histories that caused adjustments within the bridge design specs.
Chapter 2 emphasizes the necessity to take into account aesthetics from the start of the design course of and provides examples of profitable bridge tasks.
Added to the second version are a dialogue of integral abutment bridges and a piece on the use of laptop modeling in planning and design.
Chapter 3 presents the fundamentals on load and resistance issue design (LRFD) and signifies how these components are chosen to acquire a fascinating margin of security.
Included on the finish of all of the chapters within the second version are issues that can be utilized as pupil workout routines or homework assignments.
Chapter 4 describes the character, magnitude, and placement of the assorted hundreds that act on a bridge construction.
Chapter 5 presents affect operate strategies for figuring out most and minimal drive results because of transferring car hundreds.
Chapter 6 considers the complete bridge construction as a system and the way it needs to be analyzed to acquire a sensible distribution of forces.
Chapters 7 and 8 are the design chapters for concrete and metal bridges. Each chapters have been considerably revised to accommodate the development towards U.S. customary models inside the USA and away from SI.
New to the second version of the concrete bridge design chapter are discussions of high-performance concrete and management of flexural cracking,
adjustments to the calculation of creep and shrinkage and its affect on prestress losses, and prediction of stress in unbonded tendons at final.
Chapter 8 features a main reorganization and rewrite of content material primarily based upon the brand new specs whereby Articles 6.10 and 6.11 had been utterly rewritten by AASHTO.
This specification rewrite is a major simplification within the specs from the earlier editions/interims; nevertheless, the use of these articles just isn’t easy, and hopefully Chapter 8 supplies useful steerage.
The group of the design chapters is comparable. An outline of materials properties is given first, adopted by common design concerns.
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