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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: Repeated Loading Effect on Ultimate Static Strength of Concrete Beams
Author(s): John R. Verna and Thomas E. Stelson
Publication: Journal Proceedings
Appears on pages(s): 743-750
Abstract:A group of 16 reinforced concrete beams were tested to determine the effect of history of prior loading on their ultimate static strength. All beams were identical except for reinforcing steel which was altered to obtain different modes of failure. The test results show significant increases in beam strength for a few thousand cycles of repeated load if the beam is not susceptible to bond failure. The load levels were such that many cycles (1,000,000 o r more) would have caused a decrease in beam strength of about 40 to 55 percent. Bond failures showed no increase in strength and the most rapid deterioration in strength under cycles of load.
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