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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 and distribution of 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: Behavior of Curved Post-Tensioned Concrete Structures without Through-Thickness Reinforcement
Author(s): Jongkwon Choi, Clint R. Woods, Trevor D. Hrynyk, and Oguzhan Bayrak
Publication: Structural Journal
Appears on pages(s): 983-994
Keywords: curved post-tensioned concrete structure; delamination crack; delamination failure; friction loss; nuclear containment; size effect
Abstract:Two curved post-tensioned concrete wall assemblies were constructed and tested to delamination failure under monotonically increasing prestressing loads. In an effort to study the influence of size effect on the delamination failures observed, the nominal dimensions of the second specimen were twice those of the first, and the nominal reinforcement ratios of the two specimens were held constant. The data collected from the tests were used to investigate the underlying mechanics of the delamination failures observed and, to the authors’ knowledge, represent the first of their kind in open literature. The test results showed an apparent size effect on the delamination failures of the curved wall assemblies. Furthermore, the compressive stresses at the onset of the first delamination crack were found to be on the order of approximately 0.13fc′ to 0.23fc′, which is significantly lower than the stress limit of 0.35fc′ permitted for service load conditions as specified in ACI 359-15. Finally, the friction losses based on ACI 343R were found to underestimate the measured friction losses by approximately 38 to 43%.
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