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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 20 Abstracts search results
October 1, 1982
An appropriate time-dependent constitutive relation of concrete based on the physical principle of superposition is derived. This simple stress-strain relation is discussed in solving relaxation problems in which the change of stresses is asked for under given strain conditions. In the discussion of special problems in prestressed concrete, first demonstrated are the differential settlements of supports of continuous beams. The time-dependent deformations and changes of stresses in steel and concrete are illustrated. An especially useful equation is given for calculating the so-called loss of prestress force under the real conditions of the bonded steel in the concrete section.
In the revised CEB International Recommendations, the creep deformations of concrete are subdivided into reversible and irreversible strain components. In accordance with this new prediction method, constitutive creep laws are discussed here. The application of an algebraic stress-strain relationship for computing creep effects in cable-stayed concrete structures is shown. On the base of the creep function as formulated by CEB/DIN 4227, the "aging-coefficients" required for this algebraic approach are calculated and a numerical example is given.
Lauge Fuglsang Nielsen
In the first part of the present paper, the so-called Improved Dischinger Method, developed by the author, is identified as belonging to a class of methods which reflects the mechanical behavior of concrete in a reliable way, consistent with the assumption of linear viscoelasticity. At the same time, the basis of some other well-known methods is evaluated. In the second part of the paper, the class of methods mentioned above is evaluated with respect to practical applicability. Among other things, two features are hereby demonstrated which are much appreciated in practice, and which do not apply to any method: (1) The user has the choice of handling his problem on the basis of one of three consistent, analytically-determined alternative formulations of the stress strain relation; (2) Standard solutions may be developed which apply to any concrete. Finally, it is demonstrated how the Improved Dischinger Method may be used in "hand design" of concrete structures.
Creep tests were conducted on a number of concrete specimens. Numerous prestressed concrete beams were tested for determining deflection, relaxation, and failure under long-term loading. Some of the tests are still in progress.
A collection of 19 papers on creep and shrinkage in concrete structures. The papers discuss the effects of creep and shrinkage from the practical standpoint of the designer and offer recent research. Topics include: effects of volume changes, time-dependent slab deflections, predicting long-term prestress losses, creep strains and stress redistribution in reinforced concrete columns, analyzing time-dependent forces in continuous concrete structures, stress redistribution in cable-stayed concrete structures, drying shrinkage of high-strength concrete with superplasticizer, deflection of prestressed concrete beams. The book also includes a report from the ACI Committee on Creep and Shrinkage (209R-82) which reviews the methods for predicting creep, shrinkage and temperature effects in concrete structures. Simplified methods are used to predict the material response and to analyze the structural response under service conditions.
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