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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: Compressive Behavior of Concrete Panels Containing Steel and Plastic Ducts
Author(s): David M. Wald, Andrew Moore, Oguzhan Bayrak, and James O. Jirsa
Publication: Structural Journal
Appears on pages(s): 1167-1176
Keywords: compressive capacity; duct; panel; post-tensioning; shear strength; web crushing
Abstract:A total of 100 concrete panels containing post-tensioning ducts were loaded under pure compression to investigate the influence of duct type and diameter, concrete strength, panel thickness, and reinforcement around the duct, on the compressive capacity of the panels. Results indicated that panels with grouted plastic ducts failed at earlier stages of loading than those with steel ducts due primarily to the poor bond between plastic and concrete. Normalized panel capacity decreased as the duct diameter-to-panel thickness ratio, concrete strength, or panel thickness was increased. Inclusion of reinforcement placed transverse to the splitting cracks that formed near the ducts had a slight influence on behavior. Perhaps most importantly, code-based estimations of panel capacities were found to be both inaccurate and unconservative.
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