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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: Probabilistic Study of Reduction Coefficient for Balanced Steel
Ratio in the ACI Code
Author(s): Kazuyuki Ito and Akinori Sumikama
Publication: Journal Proceedings
Appears on pages(s): 701-709
Keywords: bending; building codes; compressive strength; probability theory; quality control; reinforced concrete; reinforcing steels; strength; structural design;
variations; yield strength.
Abstract:It is desirable to design reinforced concrete structures to be under-reinforced to avoid the brittle failure of members in flexure. A method of insuring a state of under-reinforcement is proposed that considers, using probabilistic methods, the variations in strength of both reinforcing bars and concrete. The propriety of the reduction coefficient K for the balanced steel ratio pb provided in ACI 318-83 is examined, and it is shown that with the ACI K-values, the probabiiity of P, of over-reinforcement is very high when concrete is placed in situ. K-values having the required reliability are presented also.
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