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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: Shear Tests of High- and Low-Strength Concrete Beams Without Stirrups
Author(s): Andrew G. Mphonde and Gregory C. Frantz
Publication: Journal Proceedings
Appears on pages(s): 350-357
Keywords: beams (supports); compressive strength; cracking (fracturing); high-strength concretes; regression analysis; reinforced concrete; research; shear strength; shear tests; statistical analysis; structural design.
Abstract:Three series of reinforced concrete beams without shear reinforcement were tested to determine their diagonal cracking strengths and ultimate shear capacities. Within each series the shear span-depth ratio was held constant at 3.6, 2.5, or 1.5, while nominal concrete compressive strength was varied from 3000 to 15,000 psi (21 to 103 MPa) in otherwise identical specimens. Test results indicate that for slender beams the ACI beam shear strength equations are conservative, but their accuracy varies greatly with concrete strength. A new regression equation is presented to more accurately predict ultimate shear capacity of slender beams over the entire range of concrete strengths tested. The effect of concrete strength on shear capacity becomes more significant as the beams become shorter. For the shorter beams, the ACI equation underestimates the actual shear strength by 71 percent at high concrete strengths.
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