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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: Plastic Hinging at the Intersection of Beams
Author(s): G. C. Ernst
Publication: Journal Proceedings
Appears on pages(s): 1119-1144
Keywords: no keywords
Abstract:Principal object of investigation was to determine the amount of concentrated plastic rotation developed at the connection between beams and columns. Thirty-three tests were conducted, some at a slow loading rate, some at a fast loading rate equivalent to that, prescribed for concrete cylinders. Steel ratios of 0.01, 0.03 and 0.05, column widths of 6, 12, 18, 24, and 36 in., and nominal concrete strengths of 3000 and 4000 psi were used. Concentrated plastic rotation at concrctc crushing and at maximum moment, is markedly reduced when the steel ratio cxcecds 0.01, and is also less for a fast loading rate. Theoretical moments agreed satisfactorily with experimentally determined moments in all casts. At concr&e crushing for the 0.05 steel ratio under fast loading, concentrated plastic rot,ation was virtually negligible. It seems necessary, therefore, to consider the effect of steel ratio and rate of loading in cases for which the ultimate capacity of a structure is dependent, upon a redistribution of moment produced by concentrated plastic rotations.
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