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The purpose of the authors has been to present the fundamentals of reinforced concrete design as simply and completely as possible. The method of the transformed section, more familiar in European than in American texts, is used for the development of the theory as it is believed to be by far the clearest and most logical approach. It has the great advantage that instead of leaving the student with a mass of formulas which are often difficult to visualize, it impresses on his mind the basic concepts of the subject and frees him from dependence on texts and equations. The usual formulas are presented as the basis of diagrams and tables, indispensable as time-savers in practice. The computations that illustrate the application of the theory are arranged systematically in the form usual in office work, with parallel comments in the text. This manner of presentation enables the reader to grasp the problem as a logical whole and gives the student a clear idea of the proper manner of presenting design calculations and results. It is hoped that this arrangement will free the instructor from the drudgery of detailed presentation of designs and enable him to devote the class hour to general discussion of the important features. The computations cover a wide range of construction: retaining walls, slab and beam bridges, floors, columns and footings for buildings, and the hinge less arch. It is hoped that the discussion paralleling these examples will serve to make plain many matters not usually explained in text books.

Enough is included about the modern theories of concrete, formwork, drawing and detailing to give a good background of knowledge in matters where real proficiency can come only with experience. By combining the viewpoint of the teacher and the practicing engineer the authors have endeavored to direct the work of the student to practical ends with no sacrifice of theory. While the book is primarily for the student of engineering, it is believed that it will prove useful to the practitioner by reason of its compact and complete presentation of specific problems with discussion of the reasons for the various operations. Unless he is a specialist in this field he will find particularly useful the articles dealing with the analysis of rigid frames by the slope deflection method and those treating of arch design. It is assumed that the reader is conversant with the principles of applied mechanics and understands the elements of design in steel and wood, such knowledge being almost a necessity as a preliminary to the study of reinforced concrete. However, for the sake of completeness and for an aid to rapid review, these fundamental principles are outlined briefly and simply in the text.

The authors wish to express their appreciation to the many friends who have aided their work. It has been their intention to give full credit in the text to all to whom they stand indebted for material and for ideas. With the passage of time a great deal of fundamental information has become common property and the sources are too often not recorded. It is hoped that no borrowings have been inadvertently and wrongfully assumed to belong in that class. The engineer thinks in pictures at all stages of the analysis and design of structures. It is a practice the student should carefully cultivate.

As a basis for work in reinforced concrete design there are two fundamental pictures to be fixed in mind: that of a free rigid body at rest acted on by a system of coplanar forces, conforming to the conditions ZX = 0, Y = 0 and M = 0; that of the free body at rest formed by isolating a portion of a reinforced concrete member for purpose of analysis. Form the habit of expressing the problems of design simply and clearly in terms of these basic diagrams.