Prestressed Concrete A Fundamental Approach Fifth Edition by Edward G. Nawy
Book Details :
LanguageEnglish
Pages977
FormatPDF
Size21.7 MB

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Prestressed Concrete A Fundamental Approach Fifth Edition by Edward G. Nawy



PREFACE:

Prestressed concrete is a widely used material in construction. Hence, graduates of every civil engineering program must have, as a minimum requirement, a basic understanding of the fundamentals of linear and circular prestressed concrete.

The high technology ad- vancements in the science of materials have made it possible to construct and assemble large-span systems such as cable-stayed bridges, segmental bridges, nuclear reactor vessels, and offshore oil drilling platforms-work impossible to undertake in the past. Reinforced concrete's tensile strength is limited, while its compressive strength is extensive.

Consequently, prestressing becomes essential in many applications in order to fully utilize that compressive strength and, through proper design, to eliminate or control cracking and deflection. Additionally, design of the members of a total structure is achieved only by trial and adjustment: assuming a section and then analyzing it.

Hence, design and analysis are combined in this work in order to make it simpler for the student first introduced to the subject of prestressed concrete design This completely updated fifth edition of the book revises the previous text so as to conform to the new ACI 318-08 Code and the International Building Code, IBC 2006-2009, for seismic design, stressing the strain limits approach, sometimes termed as the "unified method" in the code.


The text is the outgrowth of the author's lecture notes developed in teaching the subject at Rutgers University over the past 45 years and the experience accumulated over the years in teaching and research in the areas of reinforced and prestressed concrete in- clusive of the Ph.D. level, and the consulting engineering and forensic work that the author has been engaged in over the years.

The material is presented in such a manner that the student can become familiarized with the properties of plain concrete, both normal and high strength, and its components prior to embarking on the study of structural behavior.

The book is uniquely different from other textbooks on the subject in that the major topics of material behavior, prestress loss, flexure, shear, and torsion are self contained and can be covered in one semester at the senior level and the graduate level.

The in-depth discussions of these topics permit the advanced undergraduate and graduate student, as well as the design engineer, to develop with minimum effort a profound understanding of fundamentals of prestressed concrete structural behavior and performance.

The concise discussion presented in Chapters 1 through 3 on basic principles, the historical development of prestressed concrete, the properties of constituent materials, the long-term basic behavior of such materials, and the evaluation of prestress losses should give an adequate introduction to the subject of prestressed concrete.

They should also aid in developing fundamental knowledge regarding the reliability of performance of prestressed structures, a concept to which every engineering student should be exposed today. Chapters 4 and 5 on flexure, shear, and torsion.


With the step-by-step logic of trial and adjustment as well as the flowcharts shown, give the student and the engineer a basic understanding of both the service load and the limit state of load at failure, using the new ACI 318-08 Code requirements for ultimate load design, thereby producing a good feel for the reserve strength and safety factors inherent in the design expressions.

Chapter 4 in this edition contains the latest design procedure with numerical examples for the design of end anchorages of post-tensioned members as required by the latest ACI and AASHTO codes. An extensive

Chapter 5 presents, with design examples, the provisions on torsion combined with shear and bending, which include a unified approach to the topic of torsion in reinforced and prestressed concrete members. SI Units examples are included in the text in addition to having equivalent SI conversions for the major steps of examples throughout the book.

Additionally, a detailed theoretical discussion is presented on the mechanisms of shear and torsion, the various approaches to the torsional problem and the plastic concepts of the shear equilibrium and torsional equilibrium theories and their interaction.

A totally new section is added on the strut-and-tie modeling of forces in deep beams and corbels, with detailed design examples as required by the latest ACI Code provisions.


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