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PREFACE:
This text introduces engineering and architectural students to the basic techniques required for analyzing the majority of structures and the elements of which most structures are composed, including beams, frames, trusses, arches, and cables.
Although the authors assume that readers have completed basic courses in statics and strength of materials, we briefly review the basic techniques from these courses the first time we mention them. To clarify the discussion, we use many carefully chosen examples to illustrate the various analytic techniques introduced, and whenever possible, we select examples confronting engineers in real-life professional practice.
We present the topics in this book in a carefully planned sequence to facilitate the student’s study of analysis. In addition, we tailor the explanations to the level of students at an early stage in their engineering education. These explanations are based on the authors’ many years of experience teaching analysis. In this edition, we have streamlined the presentation by restructuring the book from 18 to 16 chapters while still keeping all the important materials.
Chapter 1 provides a historical overview of structural engineering (from earliest post and lintel structures to today’s high-rises and cable-stayed bridges) and a brief explanation of the interrelationship between analysis and design. We also describe the essential characteristics of basic structures, detailing both their advantages and their disadvantages.
Chapter 2 on loads is described above in Features of This Text.
Chapters 3, 4, and 5 cover the basic techniques required to determine by statics bar forces in determinate trusses, and shear and moment in determinate beams and frames. Methods to identify if the structure is determinate are also presented.
Chapter 6 interrelates the behavior of arches and cables, and covers their special characteristics (of acting largely in direct stress and using materials efficiently).
Chapters 7 and 8 provide methods used to compute the deflections of structures. One direct application is to use it to analyze indeterminate structures by the method of consistent deformations in Chapter 9.
Chapters 9, 10, and 11 introduce three classical methods for analyzing indeterminate structures. The method of consistent deformations in Chapter 9 is classified as a flexibility method, while the slope-deflection and moment distribution methods in the other two chapters are classified as the stiffness method.
Chapter 12 introduces the concept of influence linesand covers methods for positioning live load that can vary in space on determinate and indeterminate structures to maximize the internal force at a specific section of a beam, frame, or bars of a truss. Engineers use this important concept to design bridges or other structures subject to moving loads or to live loads whose position on the structure can change.
Chapter 13 gives approximate methods of analysis, used to estimate the value of forces at selected points in highly indeterminate structures.
With approximate methods, designers can perform preliminary member sizing, verify the accuracy of computer studies analysis results, or check the results of more traditional, lengthy hand analyses described in earlier chapters. Chapters 14, 15, and 16 introduce matrix methods of analysis.
Chapter 14 extends the general direct stiffness method to a variety of simple structures. The matrix formulation of the stiffness method, which is the basis of modern structural analysis software, is applied to the analysis of trusses (Chapter 15) and to the analysis of beams and frames (Chapter 16).
