Research Article
Nov 1977
Torsional-Balanced Steel in Concrete Beams
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VIEW THE REPLYPublication: Journal of the Structural Division
Volume 103, Issue 11
Abstract
Presently design of rectangular concrete beams under torsion is limited to underreinforced sections only. To ascertain the underreinforced character of a concrete beam it is necessary to know the balanced or maximum percentages of longitudinal and stirrup steel which can yield at failure of the beam. A semitheoretical approach based on space truss analogy has been presented to evaluate the torsional balanced percentages of reinforcements. For equal yield stresses, the balanced volume ratio between longitudinal and stirrup steel equals 1.3. Total percentage of torsional-balanced steel depends upon the concrete strength, yield stresses of reinforcements, the ratios of larger to shorter dimension of stirrups, and core area to total cross-sectional area of the beam. Beams failing under torsion can be classified according to yielding of both, either or none of the form of longitudinal and stirrup steel. Unlike flexure, a torsional-balanced failure is not accompanied by crushing of concrete.
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Published In
Journal of the Structural Division
Volume 103 • Issue 11 • November 1977
Pages: 2181 - 2191
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Nov 1977
Published online: Feb 1, 2021
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Authors
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Madhusudan Chakraborty
Lect. of Struct. Engrg., Jadavpur Univ., Calcutta, India
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.