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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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.
Title: Creep Prediction for Concrete Under Multiaxial Stress
Author(s): John M. Illston and Ian J. Jordaan
Publication: Journal Proceedings
Appears on pages(s): 158-164
Keywords: axial loads;biaxial loads;compression;concretes;creep properties;deformation; Poisson's ratio;research;strains;stresses;structural analysis;triaxial loads.
Abstract:Previous texts indicate that a reasonable, although not exact, assumption in the prediction of creep strains resulting from multiaxial stresses is that the Poisson's ratio for creep is constant and equal to the state elastic value. To predict creep under multiaxial loading this assumption was combined with the rate of flow method, developed essentially for the prediction of axial creep strains under uniaxial loading. Creep predictions, on the basis of independently obtained control data, are compared with the experimental strains obtained from multiaxially loaded concrete specimens. Only moderate stress levels were considered and all specimens were sealed. The results of the comparision indicate satisfactory agreement between the proposed method and the test results. Second-order effects not taken into account in the analysis are discussed. A numerical example is included in the Appendix to show the application of the proposed method.
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