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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: Local Bond-Slip Relationships by Means of the Moire Method
Author(s): T.P. Tassios and E.G. Koroneos
Publication: Journal Proceedings
Appears on pages(s): 27-34
Keywords: bonding; bond stress; composite construction (concrete and steel);cyclic loads; loads (forces);slippage; strains;stresses.
Abstract:An overall optical method (the differential Moire method)is used to visulaize the full field of stresses, strains, and slips at the interface between concrete and a steel tensioned from outside. The interface is simultaneously loaded in the transverse direction by a compressive force. From the induced mechanical interference pattern between a 20 lines per mm grating, glued on the specimen, and an external (underformed)grating, the longitudinal displacement s is determined at grid points on the interface. Similarly, the steel strains are determined, allowing for steel stress evaluation. Consequently, by differentiation of the steel stress diagrams, local bond stresses t are evaluated. By compliation of coupled t and s values, a local-bond verses load-slip curve is found, which constitutes abasic tool for analytical treatment of a series of bond degredation problems, under both monotonic and cyclic loading.
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