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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: Ultimate Strength and Cracking Resistance of Lightly Reinforced Beams
Author(s): S. D. Lash
Publication: Journal Proceedings
Appears on pages(s): 573-582
Keywords: no keywords
Abstract:The ultimate strength of beams reinforced with 1 percent or less of inter-mediate grade steel is somewhat greater than that indicated by either the plastic or conventional theories. This is because the theories neglect the effect of concrete in tension below the neutral axis. The excess is not great except for beams made with high strength concrete and small amounts of steel. Cracking resistance of lightly reinforced beams depends upon the strength of the concrete and the amount of reinforcement. The tensile modulus of rupture of the concrete is increased significantly by the presence of reinforcement. Deflection of a beam at yield of steel is independent of the amount of steel, provided the ratio of reinforcement is 0.7 percent or more. Below this limit the deflection diminishes and may be quite small.
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