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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: Ultimate Torsional Properties of Rectangular
Reinforced Concrete Beams*
Author(s): G. C. Ernst
Publication: Journal Proceedings
Appears on pages(s): 341-356
Keywords: no keywords
Abstract:Principal object of this investigation was to determine the quantity of transverse steel required to develop the yield point in longitudinal bars placed in the corners of rectangular beams subjected to pure torsion. Eighteen tests are reported: six each with #3, #4, or #5 longitudinal bars, on.e in each corner. Transverse ties were spaced at 2% 14, 7, and 4 in., and also in pairs at 4 in. for each group all of #2 size. One beam in each group contained no transverse reinforcement, and the nominal concrete strength of all groups was 4000 psi. Results indicate that yield strains can be developed in longitudinal corner bars as well as in transverse ties, resulting in either a diagonal tension type of fracture or a hybrid failure in transverse shear and diagonal tension. Initial cracking corresponded to, the failure of unreinforced concrete in torsion for all beams, at an average unit shearing stress of 312 psi. Evidence also developed supporting the concept of a transition from elastic to plastic states of as the ratio of transverse t o longitudinal steel approaches unity. Stress
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