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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: Torsional Behavior of Normal- and High-Strength Concrete Beams
Author(s): I-Kuang Fang and Jyh-Kun Shiau
Publication: Structural Journal
Appears on pages(s): 304-313
Keywords: ductility stiffness; high-strength concrete; torsion
Abstract:The experimental results of torsional strength and deformation for normal- and high-strength concrete (NSC and HSC, respectively) beams are presented. Eight NSC (f¢c = 35 MPa) and eight HSC (f¢c = 70 MPa) beams, with a cross section of 350 x 500 mm and various amounts of torsional reinforcement, were tested under pure torsion. Test results showed that the HSC beams had higher torsional strength and cracked stiffness than the NSC beams designed with the same amount of reinforcement. Beyond the peak strength, HSC beams exhibited relatively steeper strength decay than NSC beams for those with higher reinforcement. The experimental ultimate strength was approximately 1.1 times the calculated result by design provision of the ACI 318-02 Code. The orientation of compression diagonals was not affected by the compressive strength of concrete. For the same applied torque, the principal tensile strains in HSC beams were less than those in NSC beams.
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