Cyclic Behavior of Corroded Fuse-Type Dissipaters for Posttensioned Rocking Bridges
Publication: Journal of Bridge Engineering
Volume 23, Issue 4
Abstract
This article presents the observed cyclic responses of three types of metal hysteretic, axial dissipative devices (typically used with dissipative controlled rocking bridge piers) under varying degrees of corrosion. Dissipative controlled rocking bridge piers employ a combination of unbonded posttensioning tendons and external replaceable dissipaters. Unbonded posttensioning provides the ability to self-center, and dissipaters absorb seismic energy. The quality and properties of dissipaters decrease over time as a result of corrosion, which needs to be considered for capacity evaluations. The effects of chloride-induced corrosion on the hysteretic and cyclic response of these dissipaters were studied experimentally. To save time, the dissipaters, having equal length and cross-sectional area in the reduced area, were corroded using an accelerated corrosion technique called the impressed current method at a corrosion rate of 800 . Cyclic (tensile-compression) tests for 36 dissipaters in total were conducted under three levels of corrosion and two different deformation rates. This investigation has resulted in clear quantification of the relationship between the degree of corrosion and both cyclic and hysteretic properties of the dissipaters studied.
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Acknowledgments
The research program was supported by the Natural Hazards Research Platform (NHRP), Advanced Bridge Construction and Design for New Zealand (ABCD–NZ Bridges) project, 2011–2015, and QuakeCore partially co-funded the final-year Ph.D. study of Kaveh Andisheh. The authors also acknowledge the technicians at the Structures Laboratory at the University of Canterbury for their contribution.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 4 • April 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Feb 11, 2017
Accepted: Sep 12, 2017
Published online: Jan 30, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 30, 2018
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