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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: A New Design Method for Shear in
Prestressed Concrete Girders
Author(s): A. Laskar, T.T.C. Hsu, and Y.-L. Mo
Publication: Special Publication
Appears on pages(s): 579-602
Keywords: full-scale tests; prestressed concrete; shear design; shear strength.
Abstract:Five full-scale prestressed concrete I-beams were tested to explore the effect of three variables: the shear-span-to-depth ratio (a/d), the transverse steel
ratio ?t, and the presence of draped strands, on the web-shear and the flexural-shear capacity. The results from these five tests, together with 143 test beams found in literature, were used to develop an accurate, yet simple, equation for the shear strengths of prestressed concrete beams. This new equation is a function of the a/d ratio, the strength of concrete vfc', the web area bwd, and the ?t ratio. Although the ACI and AASHTO shear provisions include two other variables, namely, the prestress force and the angle of failure crack, this study showed that these two variables had no significant effect on the shear capacity. In addition, a new formula was derived to preclude the web crushing of concrete before the yielding of transverse steel, and the ACI minimum stirrup requirement was evaluated. The new shear design method hasbeen compared with the shear provisions of the ACI 318-08 and the AASHTO specifications. Finally, the simplicity and rationality of the new method has also been illustrated by a design example.
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