Analysis of structural effects of time-dependent behaviour of concrete: an internationally harmonized format
EDN: YNSGBX
Аннотация
Modern concrete structures, realized through complex sequential construction techniques and/or characterized by significant non-homogeneities, are in general very sensitive to the effects of time-dependent behaviour of concrete (creep and shrinkage).
Guidelines for the evaluation of these effects were developed in the last decades by international pre-standard and standard institutions on the basis of a common, although progressively evolving, scientific background, and of a substantially worldwide harmonized format.
The author discusses the development, with his large personal involvement, of this favourable scenario, evidencing areas of well established consensus and open problems.
In what concerns more specifically the effects of creep, it is commonly accepted that a reliable analysis of the structural response in service conditions may be performed on the basis of the theory of ageing linear viscoelasticity, first established by Italian mathematician Volterra at the dawn of 20th century.
The paper discusses the computational implications of this approach with reference on the one hand to the adoption of realistic advanced models for the prediction of the creep behaviour of concrete, and, on the other hand, to the complexity and sequential character of the constructions, and illustrates current updated guidelines developed at the international level for the evaluation of the effects of creep, both in the conceptual and preliminary design stages and in the subsequent detailed construction-stage and long-term reliability analyses of complex and sequential structures . These guidelines are intended to deal also with other phenomena, which are responsible of causing deviations from aging linear viscoelasticity, like tensile cracking, cyclic creep, and stress relaxation in prestressing tendons at variable strain, as well as the effects of humidity and temperature variations.
The paper must be intended also as a homage to the memory of CEB (Comité Euro-International du Béton, Euro-International Committee for Concrete) Honorary Member and member of the Academy of Construction and Architecture of the USSR Alexei A. Gvozdev, for long-time head of the laboratory of reinforced concrete of NIIZhB, the Institute for Concrete and Reinforced Concrete now named after him, for his crucial role in encouraging and assisting the author in the initial steps of transporting into CEB and FIP (Fédération Internationale de la Précontrainte, International Federation for Prestressing) ambient the fundaments of this new advanced format for creep analysis, to which the school of Soviet scientists and Gvozdev himself had given a fundamental contribution.
Об авторе
M.A. Chiorino
Politecnico di Torino
Италия
Италия
Mario Alberto CHIORINO, Professor Emeritus of Structural Analysis, Polytechnic of Turin; National Member Turin Academy of Sciences; Honorary Member American Concrete Institute. Past Chair of ACI Committee 209 Creep and Shrinkage in Concrete.
Politecnico di Torino DAD, Viale Mattioli 39, I-10125.Turin, Italy.
e-mail: mario.chiorino@polito.it
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Рецензия
Для цитирования:
Chiorino M. Analysis of structural effects of time-dependent behaviour of concrete: an internationally harmonized format. Вестник НИЦ «Строительство». 2018;16(1):31-47. EDN: YNSGBX
For citation:
Chiorino M. Analysis of structural effects of time-dependent behaviour of concrete: an internationally harmonized format. Bulletin of Science and Research Center of Construction. 2018;16(1):31-47. (In Russ.) EDN: YNSGBX
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