Research Article
Apr 1971
Torsion, Bending, and Shear in Prestressed Concrete
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VIEW THE REPLYPublication: Journal of the Structural Division
Volume 97, Issue 4
Abstract
An ultimate strength interaction criterion for web reinforced, prestressed concrete beams under torsion, bending moment and flexural shear is presented. Principal variables considered are the level of prestress and its eccentricity, torque: bending moment ratio, and flexural shear. Test results for 54 rectangular beams include beam properties, ultimate strength, angle of twist at failure, torque-twist curves and typical crack patterns. Bending moment in moderate amounts increases the torsional strength, but the effect of flexural shear is always detrimental. Within limits, the web reinforcement provides a ductile type behavior with ample rotation capacity at failure. The initial torsional stiffness is not affected by the variables considered. Higher levels of prestress and web reinforcement increase the pure torsional strength. Torsion-bending moment interaction is represented by a second degree parabola, and a three-dimensional curved interaction surface is envisaged when flexural shear is also present. Proposed interaction equations indicate good correlation with test data.
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Published In
Journal of the Structural Division
Volume 97 • Issue 4 • April 1971
Pages: 1063 - 1079
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Apr 1971
Published online: Feb 1, 2021
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Authors
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Priya R. Mukherjee
Res. Fellow; Dept. of Civ. Engrg., Univ. of Strathclyde, Glasgow, Scotland
Joseph Warwaruk, M.ASCE
Prof. of Civ. Engrg., Univ. or Alberta, Edmonton, Alberta, Canada
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