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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: Prediction of Stress in Bonded Strands at Flexural Strength
Author(s): Jae-Hyun Park, Ho Park, and Jae-Yeol Cho
Publication: Structural Journal
Appears on pages(s): 697-705
Keywords: approximate equation; design codes; flexural strength; high strength; strands; stress
Abstract:With respect to prestressed concrete, important changes to the structural design codes and notable improvements of the materials have been made over the past decade. The most recent examples are the introduction of the net tensile strain to ACI 318 and the development of high-strength strands. The influences of the net tensile strain and high-strength strands have not been properly evaluated, however, or reflected in the related design code provisions; this is especially the case for the approximate equations that are used to calculate the stress in strands at the flexural strength. Therefore, in this paper, the approximate equations of the current ACI 318 and CSA A23.3 codes are investigated. A series of strain compatibility analyses revealed that the current approximate equations yield unconservative results for flanged sections and highstrength strands; based on these analyses, a modified version of an approximate equation is proposed to take into account the influences of flanged sections and high-strength strands.
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