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  • ACI
    446.4R-04: Report on Dynamic Fracture of Concrete
    Edition: 2004
    $103.95
    / user per year

Content Description

This report summarizes information regarding the analysis of concrete systems subjected to rapid loading. Engineers will obtain an overview of the subject matter along with recommended approaches for analysis and selection of material properties. Researchers will obtain a concise source of information from leading authorities in the field conducting research and applying these concepts in practice. This report describes how, as strain rates increase above 10 –4 to 10 –3 s –1 , concrete in tension and compression becomes stronger and stiffer, with less prepeak crack growth and less ductile behavior in the postpeak region. The rate dependence of bond is shown to be due to local crushing around deformations of the bar and to have the same relationship to rate as compressive strength. The practical effect of this local crushing is to concentrate strains in a small number of cracks, thus lowering the overall ductility of reinforced members. Finally, it is concluded that computational models of postpeak behavior under either dynamic or static load should use a localization limiter so that strain softening into arbitrarily small regions is prevented. The models should also properly pose the equations of motion; one appropriate way to do this is to represent softening through rate dependence, such as viscoplasticity. Keywords: computational modeling; concrete-reinforcement bond; cracking; fracture energy; fracture mechanics; fracture toughness; size effect; strain rate; stress-intensity factor; stress rate.

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About ACI

Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational & training programs, certification 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. ACI has over 95 chapters, 110 student chapters, and nearly 20,000 members spanning over 120 countries.
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