Chapter
Apr 4, 2017
Strength, Ductility, and Prestress Losses of Unbonded Post-Tensioning Strands in Self-Centering Structures
Authors: Cancan Yang [email protected], Maria Lopez Ruiz [email protected], and Pinar Okumus [email protected]Author Affiliations
Publication: Structures Congress 2017
Abstract
Unbonded post-tensioning strands have been employed in numerous research studies for precast concrete bridge piers to provide restoring force under seismic loading. When designing these systems, premature fracture of strands due to stress concentrations at anchorages and post-tensioning losses should be considered. Previous studies on unbonded strands between post-tensioning anchorages under cyclic loading are limited to 12.7-mm and 15.2-mm diameter strands and have been largely based on small-scale testing. Only a few of these studies reported post-tensioning losses. This research assessed the behavior of post-tensioning strands under cyclic loading to fill these gaps. The experimental program included 12.7-mm, 15.2-mm or 17.8-mm diameter, seven wire, 1860 MPa ultimate strength, low-relaxation strands between standard anchorage chucks. Stress-strain relationships and the anchorage wedge-seating of post-tensioning strands under cyclic loading were obtained. Post-tension losses were predicted based on the small-scale results and compared to the loss of a large-scale case study.
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© 2017 American Society of Civil Engineers.
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Published online: Apr 4, 2017
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Ph.D. Student, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, 206 Ketter Hall, Buffalo, NY 14260. E-mail: [email protected]
Undergraduate Student, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, Ketter Hall, Buffalo, NY 14260. E-mail: [email protected]
Assistant Professor, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, 222 Ketter Hall, Buffalo, NY 14260. E-mail: [email protected]
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