forwarded

FOREWORD TO FIRST AND SECOND EDITIONS 'TN concrete it is generally simpler and more economical to build the structure continuous than otherwise;"* but continuous structures have required more time and effort to design. Most of the difficulties formerly encountered in design of rigid frames can now be overcome. Design data, including practical short-cuts and time-saving design tools, are available; but they are so scattered that few designing engineers have sufficient time or opportunity to assemble all the information and to acquire a work ing knowledge of the subject. Data from numerous sources have been collected, co-ordinated and presented in this booklet. It contains a detailed analysis of a rigid frame concrete bridge. It also gives a new and simple method of determining stresses in double reinforced concrete sections subject to combined bending and axial thrust. The subject of skew frames is discussed. Charts of coefficients for design and a bibliography are also included. The presentation is brief but complete enough to enable designers of bridges to analyze a rigid frame concrete bridge in a reasonably short time. By direct extension of the methods given, the booklet is equally applicable to the design of any other continuous structure. Results are obtained most rapidly from a study of the booklet if the sections on general theory are first given a cursory reading, followed by a thorough checking of the calculations given in the nine problems. It is advisable to make frequent references to the sections on general theory during the study of the problems. Finally, a rigid frame with arbitrary layout and loading may be completely analyzed by following the procedure presented in the problems. FOREWORD TO THIRD EDITION Recent developments call for revision of the previous editions. New studies have been made, the results of which are presented here. Foremost among these are: Simplified procedures to be used in preliminary designs, and methods of treating frames allowing for deck curvature. Some structural details have also been added. Now as before, it is the purpose of the booklet to illustrate and discuss — not to specify. ♦Hardy Cross in Proc. American Concrete Institute, 1929. Hardy Cross is Professor of Structural Engineering at the University of Illinois. Generated on 2015-11-26 09:18 GMT / http://hdl.handle.net/2027/coo.31924003881277 Public Domain, Google-digitized / http://www.hathitrust.org/access_use#pd-google

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FOREWORD TO FIRST AND SECOND EDITIONS'TN concrete it is generally simpler and more economical to build

the structure continuous than otherwise;"* but continuousstructures have required more time and effort to design.

Most of the difficulties formerly encountered in design of rigidframes can now be overcome. Design data, including practicalshort-cuts and time-saving design tools, are available; but they are

so scattered that few designing engineers have sufficient time or

opportunity to assemble all the information and to acquire a working knowledge of the subject.

Data from numerous sources have been collected, co-ordinatedand presented in this booklet. It contains a detailed analysis of a

rigid frame concrete bridge. It also gives a new and simple method of

determining stresses in double reinforced concrete sections subjectto combined bending and axial thrust. The subject of skew frames is

discussed. Charts of coefficients for design and a bibliography are

also included.

The presentation is brief but complete enough to enable designers

of bridges to analyze a rigid frame concrete bridge in a reasonablyshort time. By direct extension of the methods given, the booklet is

equally applicable to the design of any other continuous structure.

Results are obtained most rapidly from a study of the bookletif the sections on general theory are first given a cursory reading,followed by a thorough checking of the calculations given in the

nine problems. It is advisable to make frequent references to the

sections on general theory during the study of the problems. Finally,a rigid frame with arbitrary layout and loading may be completelyanalyzed by following the procedure presented in the problems.

FOREWORD TO THIRD EDITIONRecent developments call for revision of the previous editions.

New studies have been made, the results of which are presented

here. Foremost among these are: Simplified procedures to be used

in preliminary designs, and methods of treating frames allowing fordeck curvature. Some structural details have also been added.

Now as before, it is the purpose of the booklet to illustrateand discuss —not to specify.

♦Hardy Cross in Proc. American Concrete Institute, 1929. Hardy Cross is Professor of StructuralEngineering at the University of Illinois.

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