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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: Bent-Cap Confining Stress Effect on Slip of Prestressing Strands
Author(s): Mohamed K. ElBatanouny, Paul H. Ziehl, Aaron Larosche, Timothy Mays, and Juan M. Caicedo
Publication: Structural Journal
Appears on pages(s): 487-496
Keywords: confining stress; development length; embedment length; shrinkage; slipping
Abstract:Reverse cyclic load testing was completed involving four prestressed concrete pile specimens embedded into cast-in-place (CIP) reinforced concrete bent caps. The piles used were 18 in. (457 mm) square x 18 ft (5.5 m) long and were plainly embedded into the bent cap to depths of 18, 22, and 26 in. (457, 560, and 660 mm). The tests were conducted to determine the moment capacity and ductility of the connections along with the slipping stress of the strands. Analytical models were created in which the slipping stress of the strands was calculated using the ACI 318-08 equation for development length. In all cases, the connection achieved more moment than expected due to the confining stress produced from the bent cap, which tends to decrease the development length of the strands. A modified equation that accounts for the beneficial effect of concrete confinement due to shrinkage is introduced.
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