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Preface to the first edition
Preface to the first edition. Plastic design of steel beams and frames has been included in building codes since 1948 in Great Britain and since 1959 in the United States. The increased use of plastic design and the present trend toward applying its methods to reinforced and prestressed concrete indicate that the basic advantages of plastic analysis - accurate estimate of the collapse load, simplicity of application, and economy of structure - are more and more appreciated b'v practicing engineers. Codes on reinforced concrete slabs (European Conuuittee for Concrete) and on pressure vessels (ASME) are on the way to adopt plastic limit state as one of the design criterions. Hence, it was felt urgent to provide all interested people with a ~'nthesis work on the subject. The present book is the English version o f " C alcul plastique des Constructions " Volume 2, 2nd edition, published by the Centre Belgo-Luxembourgeois d'Information de l'Acier in Brussels, Belgium. Together with this second edition in French. which is to appear nearly contemporarily, not only has it been brought up to date but also appreciably improved with respect to the first edition in French " - new experimental results have been introduced, to better clarif3" the real physical significance of the theoretical limit load, particularly in Chapters 6 and 8. - the treatment of circular plates has been re-written in a more ~'stematic manner - Section 6-8 on minimum-weight design has been re-written and amplified -
in Chapter 7 on reinforced concrete plates, a more satisfactor3' derivation of the yield
surface has been achieved, the delicate question of nodal forces has been laced in a clearer manner, statically admissible and complete solutions have been amplified, economy of reinforcement has been treated in am more rational manner, as xvell as the influence of the axial forces - Chapters 8 and 9 contain many new additions of nexv theoretical solutions and experimental information - only Chapter 10 is practically unchanged except for the new section on notched bars in tension On the other hand. the main features of the first edition in French have been maintained, namely "
- the book is directed toward engineering applications 9consequently, we have limited the mathematics to what was strictly needed, and we have avoided an',' formalism that .~
.
could be unfamiliar to some engineers (as tensor notations for example). Physical significance, with reference to experimental evidence, is emphasized throughout. -
the book should ser'`'e the engineering student in plastic limit analysis " therefore, the
theory, is rigorously developed, as a rule from simpler to more complicated problems. though it was felt necessary, to base applications to particular structures on the finn ground of a general theor3.;. Though it can be read completely independently, with the sole pre-requisite basis of some knowledge of the classical theory of structures, the present book can be regarded as the companion volume o f " Plastic Analysis and Design of Beams and Frames "" Published in 1965 by Blaisdell Publishing Co.. Waltham. Mass.. U.S.A.. which is the adaptation in English to the first volume of" C alcul plastique des Constructions " devoted by the same authors to the simpler problems of beams and frames. The knowledge of the subjects treated in '" Plastic Analysis and Design of Beams and Frames " is by no means necessary to undertake studying the present work. However. references may be useful. Whenever this is done. the cited book is referred to as " Companion Volume " abbreviated as Com. V. throughout the text. We believe that the false conflict between elastic design and plastic design is now superseded. Our hope is that the present book will contribute to enlarge the designer's ability by giving him one pore tool. namely the theor3.' of limit analysis and design, together with the definition of its range of applicabili~. Though ex-tremel.v powerful, this theo~ remains nothing but a tool. to be used by the design engineer within the frame of a wider and more sophisticated design philosophy. Last but not least, we are pleased to express here our gratitude to the numerous authors ,~vhose original works have been used in this book. We have tried to give due acknowledgement to all of them. We apologize for an,,, involuntary', omission. The junior author (M.A.S.). who wrote the adaptation in English. is particularly gratefill to Professor W. Prager. v,ho read the manuscript and made many '`aluable suggestions that resulted m appreciable improvement of the text.
in Chapter 7 on reinforced concrete plates, a more satisfactor3' derivation of the yield
surface has been achieved, the delicate question of nodal forces has been laced in a clearer manner, statically admissible and complete solutions have been amplified, economy of reinforcement has been treated in am more rational manner, as xvell as the influence of the axial forces - Chapters 8 and 9 contain many new additions of nexv theoretical solutions and experimental information - only Chapter 10 is practically unchanged except for the new section on notched bars in tension On the other hand. the main features of the first edition in French have been maintained, namely "
- the book is directed toward engineering applications 9consequently, we have limited the mathematics to what was strictly needed, and we have avoided an',' formalism that .~
.
could be unfamiliar to some engineers (as tensor notations for example). Physical significance, with reference to experimental evidence, is emphasized throughout. -
the book should ser'`'e the engineering student in plastic limit analysis " therefore, the
theory, is rigorously developed, as a rule from simpler to more complicated problems. though it was felt necessary, to base applications to particular structures on the finn ground of a general theor3.;. Though it can be read completely independently, with the sole pre-requisite basis of some knowledge of the classical theory of structures, the present book can be regarded as the companion volume o f " Plastic Analysis and Design of Beams and Frames "" Published in 1965 by Blaisdell Publishing Co.. Waltham. Mass.. U.S.A.. which is the adaptation in English to the first volume of" C alcul plastique des Constructions " devoted by the same authors to the simpler problems of beams and frames. The knowledge of the subjects treated in '" Plastic Analysis and Design of Beams and Frames " is by no means necessary to undertake studying the present work. However. references may be useful. Whenever this is done. the cited book is referred to as " Companion Volume " abbreviated as Com. V. throughout the text. We believe that the false conflict between elastic design and plastic design is now superseded. Our hope is that the present book will contribute to enlarge the designer's ability by giving him one pore tool. namely the theor3.' of limit analysis and design, together with the definition of its range of applicabili~. Though ex-tremel.v powerful, this theo~ remains nothing but a tool. to be used by the design engineer within the frame of a wider and more sophisticated design philosophy. Last but not least, we are pleased to express here our gratitude to the numerous authors ,~vhose original works have been used in this book. We have tried to give due acknowledgement to all of them. We apologize for an,,, involuntary', omission. The junior author (M.A.S.). who wrote the adaptation in English. is particularly gratefill to Professor W. Prager. v,ho read the manuscript and made many '`aluable suggestions that resulted m appreciable improvement of the text.