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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: Camber in Prestressed Concrete Beams
Author(s): D. E. Branson and A. M. Ozell
Publication: Journal Proceedings
Appears on pages(s): 1549-1574
Abstract:Investigation examined experimentally the initial-plus-time- dependent camber deformation in both noncomposite and composite prestressed concrete beams. Meth-ods for calculating these deformations relative to certain properties of the concrete bre presented. Ten noncomposite beams and five composite beams were used in the Total camber deformation was found to follow closely the prestress level (relative to concrete strength) but to be relatively insensitive to different concrete strengths and atmospheric conditions. Total camber appears to reach its ultimate value relatively early (100 to 200 days for the test beams) compared to the long-time shrinkage and creep strains that occur. The analytical methods set forth for predicting camber deformation in both noncomposite and composite beams were found to be in good agreement with the test results. The necessary concrete coefficients for the analysis of total camber were experimentally determined and are presented here and recommended for design purposes.
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