Prestressed Beams with Openings and No Stirrups under Torsion and Bending
Publication: Journal of Structural Engineering
Volume 119, Issue 10
Abstract
Test results of 17 axially prestressed concrete beams without stirrups and containing a transverse circular opening are presented. Mainly, beams having two different opening diameters were subjected to various combinations of torsion and bending. Test results show that the bending moment has a beneficial effect and increases the torsional strength for beams with high ratios. For beams with low ratios; however, the torsional strength decreases rapidly with increasing the bending moment. Strength equations to predict the torsional strength at initial cracking are developed. Based upon the initial cracking strength, empirical equations are suggested to predict the ultimate torsional strength for all combinations of torsion and bending. The proposed equations predicted closely the torsional strength of the test beams. Comparison of similar prestressed concrete beams with and without stirrups shows that the introduction of stirrups promotes the development of a consistent failure pattern and increases the ductility and the torsional strength considerably.
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Information
Published In
Journal of Structural Engineering
Volume 119 • Issue 10 • October 1993
Pages: 2883 - 2895
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jul 8, 1992
Published online: Oct 1, 1993
Published in print: Oct 1993
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