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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: Fatigue Design Considerations for Reinforcement in Concrete Bridge Decks*
Author(s): Neil M. Hawkins
Publication: Journal Proceedings
Appears on pages(s): 104-115
Keywords: bendhq (reinforcing steels);bridge decks;bridges (structures);concrete finishes (hardened concrete);corrsion;crackinq (fracturing);cyclic loads;epoxy resins; exposure;fatigue (materials); fatigue tests;impact;loads (forces);plastics, polymers, and resins.
Abstract:Examines the realism of the 1973 AASHTO limitation on the allowable stress range for reinforcing bars in concrete bridge decks. Data are considered in turn for (I) the vehicle characteristics dictating the dominant stresses in bridge decks, (2) the factors governing the dynamic amplification of those characteristics, (3) prediction of reinforcement stresses caused by given loadings, and (4) fatigue damage characteristics for reinforcing bars, black, corroded, galvanized, epoxy coated, bent, and welded. It is shown to be unrealistic to evaluate the potential fatigue life of a bridge deck by routinely applying the provisions of the 1973 AASHTO bridge standards. For present loadings and reinforcement grades, fatigue will not be a problem unless the reinforcement is corroded, bent, poorly welded, or poorly galvanized. More realistic provisions would limit the stress range caused by moments, evaluated by the AASHTO standards for wheel loads equal to three-eighths of the legal tandem-axle load, to 21 ksi (430 kgf/cm2), for epoxy coated or black bars not exposed to corrosive influences, I9 ksi (I 300 kgf/cm2) for galvanized bars, and 17 ksi (1160 kgf/cm2) for black or galvanized bars exposed to corrosive influences.
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