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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: Flexural Strength of Prestressed Concrete Beams
Author(s): D. F. Billet and J. H. Appleton
Publication: Journal Proceedings
Appears on pages(s): 837-854
Keywords: no keywords
Abstract:Analytical and experimental studies on behavior and ultimate flexursl strength of post-tensioned, end-anchored, bonded, prestressed concrete beams are reported. A rational analysts is. developed for computing ultimate moment and steel stress at failure. Approximate expressions are given for computing ultimate steel stress for cases when the stress-strain curve for the steel reinforcement may be approximat.ed by two straight lines. Results of tests on 26 rectangular prestressed concrete beams are presented. The effect of major variables-percentage of steel, amount of prestress, and concrete strength-on deflections, cracking loads, and ultimate loads are studied. Twenty-one beams failed in flexure, either by crushing of concrete after excessive elongation of reinforcement or by crushing of concrete while steel stress was in the elastic range. Three beams were nearly balanced between shear and flexural failure, and two beams failed initially in bond. Comparisons of actual ultimate moments with those computed by analytical expressions show good agreement.
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