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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: Rectangular Spiral Binders Effect on
Plastic Hinge Rotation Capacity in Reinforced Concrete Beams
Author(s): Edward G. Nawy, Rodolfo F. Danesi, and John J.
Publication: Journal Proceedings
Appears on pages(s): 1001-1010
Abstract:Limit design of concrete indeterminate structures is based on rotation compatibility of the plastic hinges. Improved rotation capacity of the hinges permits better redistribution of moments and higher reserve strength of structural systems. This investigation deals with the use of rectangular spiral binders for confining the concrete in beams to increase the rotation capacity of the plastic hinge. These spirals serve simultaneously as diagonal tension rein-forcement. Two series were tested: tension hinges in beams 84 in. (2.1 m) span subjected to transverse load only, and compression hinges in beams 80 in. (2.0 m) span subjected to both transverse and axial load. It is found that rectangular spirals are very effective in increasing the rotation capacity of tension and compression plastic hinges. A possible maximum effective percentage by volume of rectangular spirals for p'' seems to be about 3.0 percent for tension hinges and slightly more than 2.0 percent for compression hinges.
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