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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: Minimum Bar Spacing as a Function of Bond and Shear Strength
Author(s): Phil M. Ferguson, Robert D. Turpin, and J. Neils Thompson
Publication: Journal Proceedings
Appears on pages(s): 869-887
Keywords: no keywords
Abstract:Results of investigations to establish minimum allowable bar spacings in reinforced concrete members are reported. This required considerable study on what bond strengths could be developed without any special provisions against splitting from the action of radical forces induced in the concrete by the inclined compressive forces set up by bearing of the lugs of deformed bars. An eccentric pull-out test was used to measure bond strength in specimens. Results indicate conservatism in the ACI Building Code on the matter of minimum bar spacing under some conditions, accompanied by inadequate protection against failure in bond under other circumstances.
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