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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: Effects of Increasing Allowable Compressive Stress at Prestress Transfer
Author(s): David B. Birrcher, Oguzhan Bayrak, and Michael E. Kreger
Publication: Structural Journal
Appears on pages(s): 21-31
Keywords: compressive stress; flexural cracking; prestress transfer.
Abstract:The benefits and weaknesses of increasing the allowable compressive stress at prestress transfer are presented in this paper. A historical background of the allowable release stress in compression, including a summary of several research studies that investigated this stress limit, is provided. A simple design example is used to quantify potential production and design benefits of increasing the allowable stress. The applicability of these benefits is also discussed. Finally, test results of 36 pretensioned beams that were subjected to maximum compressive stresses at release ranging from 0.46fci' to 0.91fci' are reported and analyzed. The experimental results suggest that increasing the allowable release stress in compression at midspan of a member to 0.65fci' or 0.70fci' is possible. Premature flexural cracking was observed for members subjected to midspan release stresses in excess of 0.70fci'.
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