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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: Torsion in High-Strength Concrete Hollow Beams: Strength and Ductility Analysis
Author(s): Luis F. A. Bernardo and Sergio M. R. Lopes
Publication: Structural Journal
Appears on pages(s): 39-48
Keywords: ductility; high-strength concrete; hollow beams; torsion; ultimate strength
Abstract:The ultimate behavior of high-strength concrete hollow beams is studied with respect to their strength and ductility. Sixteen beams were tested and the results are presented herein. The hollow beams had a constant square cross section and were symmetrically reinforced. The variable parameters were the concrete’s compressive strength, from 46.2 to 96.7 MPa (from 6699 to 14,022 psi), and the total amount of torsional reinforcement, from 0.30 to 2.68%. The study presented in this paper shows that the torsional ductility is low and that the range of reinforcement ratio where ductility still occurs is very narrow. Different codes of practice were compared in the light of the experimental results. As a consequence, the authors found that ACI Code is the most appropriate for predicting torsional strength and limiting torsion reinforcement, thereby leading to ductile behavior.
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