CONTINUITY IN CONCRETE BUILDING FRAMES


Practical Analysis for
Vertical Load and Wind Pressure


PORTLAND CEMENT ASSOCIATION



PREFACE TO THIRD EDITION
WITHIN the last decade continuous frame analysis has assumed a position so prominent that it is now one of the most important subjects with which the structural designer is confronted. The statement made by the Joint Committee that "the design of a monolithic frame as an aggregation of isolated members is not tenable"* may signify the closing of a period during which structural design was permitted to be made on a basis of arbitrary moment coefficients.
The subject of frame analysis now directly affects the designer's office practice. The structural engineer faces the reality of designing building frames by the elastic theory or, as it is also called, the principle of continuity, and it is the object in this text to treat that type of design as it affects the practicing engineer.
The lively interest shown in this subject originates from the procedure of moment distribution published by Hardy Cross** in 1929. His work has had a real and beneficial influence. It has helped in giving designers a clearer understanding of what goes on in a frame structure, and the method is readily applicable even to complicated frame problems. But for use in ordinary building frames, moment distribution is needed only in some condensed form and certain features incidental to analysis can be standardized. If this is not done, many designers may find it necessary to spend too much time and energy on their office work.
In presenting this new edition, it is emphasized that the procedure described is pure moment distribution. It is not a new "method". The chief innovation is that moment distribution has been limited to a scope considered sufficient for ordinary building frames. The original moment distribution has been limited to what is called "two cycles" and this limitation, slight as it may seem, opens up opportunities for introducing a labor- and time-saving arrangement of recording. But the special type of recording should not be misinterpreted and construed to signify that the moment distribution method has been changed or improved. It has merely been condensed.
It seems a natural and fortunate solution to the problem to take the best known general procedure, cut off a relatively insignificant portion of it, and to develop a type of recording which seems best suited to office practice. It has been amply tested in analyzing five complete building frames as well as in various work extending over a period of years. Experience shows it is both fast and accurate.
This condensed form of moment distribution will be valuable in design of building frames. Designers who have been using regular moment distribution will find their work greatly simplified. Others may choose....


The activities of the Portland Cement Association, a national organization, are limited to scientific research, the development of new or improved products and methods, technical service, promotion and educational effort (includingsafety work), and are primarily designed to improve and extend the uses of portland cement and concrete.


Paperback Book
5-3/4" X  8-3/4"
54 Pages
Third Edition, 1946
Very Good Condition, Some Yellowing
Original Recipients Round Name & Engineers
   Stamp from Territory of Alaska Inside Front Cover
Vintage, HardTo-Find, Collectible


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