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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: Behavior of Reinforced Concrete Horizontally Curved Beams
Author(s): Thomas T.C. Hsu, Mehmet Inan, Leonard Fonticiella
Publication: Journal Proceedings
Appears on pages(s): 112-123
Keywords: beams (supports); cracking (fracturing); curved beams; deformation; elastic analysis; failure mechanisms; flexural strength; guideways; loads (forces); rapid transit railways; reinforced concrete; statistically indeterminate structures.
Abstract:Seven reinforced concrete horizontally curved beams have been tested. Each beam had a cross section of 6 x 12 in. (15.24 x 30.48 cm), a radius of 9 ft (2.74m), and a subtending angle of 90 deg. Each beam was designed to be fixed at both ends and subjected to a concentrated load at midspan. These tests showed that significant redistribution of torsional and bending moments was observed after cracking. Therefore, the conventional design based on "Building Code Requirements for Reinforced Concrete (ACI 318-71)" and the elastic analysis assuming an uncracked section may cause premature yielding or failure at the supports. It is suggested that elastic analysis of moments should be based on cracked sections. The post-cracking torsional sttiffness of curved beams can be reasonably predicted by a theoretical equation derived by the first author.
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