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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: Re-Evaluation of the Ultimate Shear Behavior of High-Strength Concrete Prestressed I-Beams
Author(s): M. K. Kaufman and J. A. Ramirez
Publication: Structural Journal
Appears on pages(s): 295-303
Keywords: beams (supports); compressive strength; deflection; detailing; ductility; high-strength concretes; I-beams; prestressed concrete; prestressing steels; shear strength; span-depth ratio; stress transfer; trusses; web reinforcement; Structural Research
Abstract:The ultimate behavior of high-strength concrete prestressed I-beams is studied with trusses as fundamental behavioral models. Six high-strength concrete prestressed American Association of State Highway and Transportation Officials (AASHTO) I-beams were tested. Three modes of failure were observed--flexural, web crushing, and shear tension. Additional comparisons to study the effect of high-strength concrete are conducted with truss models using tests reported in the literature. Higher strength concrete can increase the utilization of web reinforcement by providing sufficient capacity to the compression struts, which flatten and cross more stirrups. The shear tension failures present a potentially serious detailing problem. Adequate ductility of high-strength concrete members can be obtained with proper design of reinforcement. Current ACI and AASHTO procedures are conservative in properly detailed members. Detailing aspects of these members are also illustrated with the aid of truss models.
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