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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: Flexural behavior of High-Strength
Author(s): Keith E. leslie, K. S. Rajagopalan, and Noel J. Everard
Publication: Journal Proceedings
Appears on pages(s): 517-521
Keywords: beams (supports);deflection;ductility;flexural strength; flexural tests;high-strength concretes;reinforced concrete;reinforcing steels; stress block; stress-strain relationships;structural analysis.
Abstract:Flexure tests are reported on 12 under-reinforced rectangular beams with f,.’ ranging between 9300 and l 1,800 psi (64 to 81 MN/m”). Serious loss of ductility is evident even when the reinforcement ratio p is less than 0.5Op!,. The currently used rectangular stress block (from the ACI Building Code) does not accurately predict the beam behavior when concrete strengths exceed 8000 psi (55 MN/m’). Pending further test results, the use of a triangular stress block seems prudent.
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