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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: A Re-Examination of the EI Value for Slender Columns
Author(s): J.G. MacGregor, U.H. Oelhafen, and S.E. Hage
Publication: Special Publication
Appears on pages(s): 1-40
Keywords: building codes; columns (supports); computers; creep properties; deflections; loads (forces); modulus of elasticity; moment curvature relationships; reinforced concrete; reinforcing steels; statistical analysis; stiffness; stiffness methods
Abstract:An incremental rate-of-creep analysis of reinforced concrete columns subjected to sustained loads is developed and used to generate data for a statistical evaluation of the stiffness, EI, of slender concrete columns subjected to short time and sustained loads. The resulting equations are more accurate than ACI Eqn. 10.7 and are as easy to use. The possibility of column failure under very high sustained loads is discussed.
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