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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: A New Approach to the Ultimate Strength of Concrete in Pure Torsion
Author(s): V. Navaratnarajah
Publication: Journal Proceedings
Appears on pages(s): 121-129
Keywords: beams (structural);microcraking;plain concrete;reinforced concrete;stresses; tensile strength;torsion;ultimate strength method (structural).
Abstract:The failure of concrete beams in pure torsion is shown to be initiated by microcracking in the concrete. On this basis an ultimate strength approach is developed for circular and rectangular beams. The ultimate strength of rectangular plain concrete beams is based on the sand heap analogy of plastic torsion with stress levels varying from the stress at microcracking to the ultimate tensile strength of concrete. The strength of reinforced beams is shown to be the sum of the strength of plain concrete and the contribution of the reinforcement. The contribution of the reinforcement towards the ultimate strength is shown to be dependent on the actual stress levels in them at failure.
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