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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: Under-Reinforced Concrete Beams Under
Author(s): Herbert A. Sawyer, Jr. and Jack E. Stephens
Publication: Journal Proceedings
Appears on pages(s): 21-29
Keywords: no keywords
Abstract:Effect of an increase in the time of application of load on both deformations and strength of under-reinforced concrete beams is reported. Intermediate grade steel and concrete of 2500 psi and 5000 psi nominal strength were used for the 14 test beams loaded with gravity-type loads. Increase in term of loading had slight effect on ultimate strength. All test strengths, regardless of term of loading, exceeded strengths calculated by the common ultimate load theories. Increase in term of loading caused important modifications in the moment-curvature relationship, including large increases in concrete strain and beam curvature at ultimate load.
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