Mechanical Behavior and Prestress Loss of Unbonded Posttension Strands in Self-Centering Structures
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 12
Abstract
Unbonded posttension strands are used between anchorages to provide restoring forces to self-centering structures. In this research, monotonic and quasi-static cyclic tests were performed on strand-anchorage assemblies to understand their mechanical properties and prestress loss. The experimental program included 12.7-, 15.2-, 17.8-mm (0.5-, 0.6-, and 0.7-in.)–diameter, 7-wire, 1,860-MPa (270-ksi) low-relaxation strands between anchorages. Strand stress-strain relationship and wedge seating were measured. Anchorages caused stress concentration for all sizes. The stress-strain relationship given by design guidelines was revised to incorporate the degradation of mechanical properties due to anchorages. Wedge seating, which was linearly related to posttension force in the monotonic and cyclic tests, was considered in a proposed strand force-displacement relationship. A method to predict loss caused by wedge seating and inelasticity was proposed. The predictions were evaluated using results of large-scale precast concrete bridge pier tests under quasi-static and dynamic loading. The proposed force-displacement relationship predicted the elastic response better than design guidelines, but underestimated the capacity. The proposed loss method accurately predicted strand response under quasi-static loading, but overestimated the strand response under dynamic loading.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by Federal Highway Administration (FHWA) through the Multidisciplinary Center for Earthquake Engineering Research (MCEER) of the University at Buffalo. The results, conclusions, and opinions given in this paper do not necessarily reflect the views of the funding agencies and the parties acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 3, 2017
Accepted: Jun 1, 2017
Published online: Oct 11, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 11, 2018
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