Effects of Nonsymmetrical Prestressing Forces on Torsion in Prestressed Thin-Walled Flexural Members
Publication: Journal of Engineering Mechanics
Volume 142, Issue 2
Abstract
Torsional resistance of a single prestressing tendon was derived on the basis of the theorem of virtual work to control the torsional rotation by nonequal prestressing forces on both sides of the webs of a flexural member. The energy formulation revealed that the vertical component of the prestressing force has a significant role in resisting the torsional rotation, whereas the axial component is responsible for the warping-related stiffness. The most influential location of the prestressing tendon was the point where the value of the warping function is maximized. The resulting finite-element equilibrium equations yielded nodal forces at the degrees of freedom corresponding to torsion and warping. Through numerical applications, it was suggested that the conventional solution method of beam finite-element formulation on the basis of the transformed cross section can be improved by adopting the nodal forces derived in this paper. Further, it was shown that the torsional rotation can be controlled by introducing nonsymmetrical prestressing forces on the right and left sides of the webs of a prestressed thin-walled flexural member.
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Acknowledgments
This research was supported by a grant (14CCTI-C063718-03) from the Technology Advancement Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Apr 1, 2015
Accepted: Jul 2, 2015
Published online: Aug 12, 2015
Discussion open until: Jan 12, 2016
Published in print: Feb 1, 2016
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