Posted by: bupka | April 22, 2010

Reinforced Concrete Design

Reinforced Concrete Structures
Chu-Kia Wang & Charles G. Salmon
Harper & Row, 1979

x +    918    Hal.

Rp.    68,000    ,-

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Preface

The publication of this third edition reflects the continuing change that is occurring in the design procedures relating to reinforced concrete structures. The transition from the working stress method as the major design philosophy to the strength design method has now largely been accomplished. Current reinforced concrete design focuses on the two basic requirements of providing adequate strength as well as satisfactory serviceability.

The specific occurrence dictating a third edition at this time is the publication of the 1977 American Concrete Institute (ACI) Building Code. The changes that have been approved in yearly supplements to the 1971 ACI Code have been combined; in addition, many editorial changes have been made in the Code that change its image (though not the substance) and thus require subtle (and sometimes not so subtle) changes in the explanatory approach.

These editorial changes include rearrangement of material and renumbering of sections, significant changes in terminology and symbols used, and the change from shear “stress” to shear “force” format.

Included in this third edition is a judicious introduction to metrication using SI units as an addition to the primary use of US customary units. While the 1977 ACI Code is not a metric code except for providing a metric equivalent table in the back, the authors believe that sufficient metrication should be included in a textbook so that some familiarity may be gained with SI units. The text provides data on metric reinforcing bars that are commonly used in many parts of the world, some design tables for material strengths in SI units, a few numerical examples in SI units, and many problems at the ends of the chapters with SI given numerical data in parenthesis at the end of the problem statement.

Regarding the choice between the Standard Metric unit of force (kilogram force, kgf) or the SI unit of force (Newton = kilogram meter per second per second), the authors have concluded that use of the Newton in accordance with ASTM (American Society for Testing and Materials) Standard E380 is likely to become the accepted approach in the US. Thus, in most parts of this book, the Newton (N) or kilonewton (kN) is used to measure force. Some use of kilogram force per centimeter squared (kgf/cm=) has been included because of its long-time usage in the non-English-speaking parts of the world. For the convenience of the readers, some conversion factors for forces, stresses, uniform loading, and moments are provided on a separate page just after this preface.

This third edition follows the same philosophical approach that has gained the wide acceptance of users since the first edition was published in 1965. Herein, as previously, strength and behavior of concrete elements are treated with the primary objective of explaining and justifying the ACI Code rules and formulas.* Then numerous examples are presented illustrating the general approach to design and analysis. Considering the limited scope of most examples, attempts to reach practical results are made insofar as possible.

Considerable emphasis is placed on presenting for the beginning, as well as the advanced, student the basic concepts deemed essential to properly understand and apply the ACI Code rules and formulas. The treatment is incorporat9d into the chapters in such a way that the reader may either study in detail the concepts in logical sequence, or merely accept a. qualitative explanation and proceed directly to the design process using the ACI Code.

Depending on the proficiency required of the student, this textbook may provide material for two courses of three- or four-semester hours each. It is suggested that the beginning course in concrete structures for undergraduate students might contain the material of Chapters 1 through 9, 13, and the spread footing portion of Chapter 20, excepting Sections 5.13 through 5.16 and 13.21 through 13.23. In addition, the first portion of Chapter 21, “Introduction to Prestressed Concrete,” is recommended for the first course. The second course may start with the continuous beam in Chapter 10, utilizing that to review many of the topics in Chapters 1 through 9. The remaining chapters—particularly Chapter 14 on deflections; Chapter 15 on length effects on columns; Chapter 16 and 17 on slabs subject to two-way action; the omitted portion of Chapter 5 relating to shear strength affected by axial force, deep beams, and brackets; Chapter 19 on torsion, and Chapter 21 on prestressed concrete—are suggested for inclusion.

Special features of the third edition are: (a) complete revision of the two chapters on two-way slab systems to reduce their length and improve teachability; (b) a new chapter on monolithic beam-to-column joints (Chapter 11); (c) a new chapter on composite construction (Chapter 22); (d) expanded introductory treatment of prestressed concrete design and behavior (Chapter 21); and (e) a completely revised chapter on combined bending and axial force effects on short length members, including new treatment of axial tension.

This complete revision has retained important special features of the second edition, including (a) comprehensive treatment of design for torsion; (b) detailed treatment of computation of beam deflections; (c) introductory treatment of yield line theory for slabs; (d) important extensive treatment of bar development length, cutoff, and anchorage requirements using the moment capacity diagram; and (e) treatment of shear requirements for effect of axial loads, deep beams, and brackets (corbels).

The authors continue to be indebted to students, colleagues, and other users of the first two editions who have suggested improvements of wording, identified errors, and recommended items for inclusion or omission. These suggestions have been duly considered and included in this complete revision wherever possible. Users of-this third edition are urged to communicate with the authors regarding all aspects of this book; particularly on identification of errors and suggestions for improvement.

The authors again gratefully acknowledge the continued patience and encouragement of their wives, Vera Wang and Bette Salmon, and to them affectionately dedicate this book.

Chu-Kia Wang and Charbe G. Salmon


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