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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: Unbonded Tendons in Post-Tensioned
Concrete Beams Under Repeated Loading
Author(s): H. W. Chung
Publication: Journal Proceedings
Appears on pages(s): 814-818
Keywords: beams (supports); crack width and spacing; cyc-lic
loads; deflection; fatigue (materials); prestressed con-crete;
research; serviceability; unbonded prestressing.
Abstract:An experimental investigation was undertaken to study the response of unbonded prestressed concrete beams to repeated loading and the effects of repeated loading on the subsequent behavior of the beams. The variables were the amount of prestressing steel and the maximum level of the repeated load. The test results indicate that the cracking and ultimate strengths are not significantly affected by the repeated load provided that the beam does not fail in fatigue, but the deflection and crack widths increase sub-stantially under repeated loading. It is recommended that in design some 25 percent extra deflection be allowed for and the limit state of crack widths be avoided.
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