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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: Development of Impact/Resonant Vibration Signature for Inspection of Concrete Structures
Author(s): H. Thronton and A. Alexander
Publication: Special Publication
Appears on pages(s): 665-680
Keywords: concrete durability; evaluation: nondestructive tests; piers; resonant frequency; safety; structures
Abstract:Sinusoidal vibration and impact loading techniques have been tested in the laboratory and on field structures. An impact system has been tested which has proven more economical and versatile than the more commonly used sinusoidal system. With transient loading, a broad band of frequencies (including the resonant frequencies) is applied to the structure simultaneously rather than sweeping through each frequency one at a time. The resonant frequency of a structure is directly related to its dynamic Young's modulus and hence its mechanical integrity. Factors that influence the soundness and safety of a structure such as continuity and boundary conditions also directly affect the resonant frequency. With the availability of digital Fourier analyzers, mathematical functions such as spectra, coherence, and transfer relationships, permit the analysis of the behavior of large structures under dynamic con-ditions in-place and in real-time. Results of laboratory and field tests established the feasibil-ity of determining mechanical properties and assessing other factors that influence the soundness and safety of concrete structures using this nondestructive testing technique.
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