Implementation of a Simplified Method in Design of Hysteretic Dampers for Isolated Highway Bridges
Publication: Journal of Bridge Engineering
Volume 22, Issue 3
Abstract
Using seismic isolation systems for highway bridges modifies the structure’s principal vibration modes and effectively reduces the seismic base shear conveyed from the superstructure to the substructure. However, for some low-damping rubber isolation bearings, large displacements can be a problem. Supplemental hysteretic dampers can be introduced into the base-isolated bridge, which might nevertheless increase the structure base shear, and the merit of adding dampers has to be evaluated properly. In this paper, a simplified method was implemented for the design of a low-cost hysteretic damper, and the resulting isolator-damper system was tested experimentally. The design method used is based on an equivalent linearization approach. A full-scale elastomeric isolation bearing was characterized and used in the design of a hysteretic damper. Both the isolator and the damper went through cyclic testing and real-time dynamic substructuring (RTDS) methods to verify the capacity of the method to design base isolation-damping systems. The study was further extended to extreme seismic loading by nonlinear time-history analysis. The results reveal that the simplified method is adequate for use in the performance optimization of isolated-damped bridges.
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Acknowledgments
This research is part of the Canadian Seismic Research Network. The authors gratefully acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada under the Strategic Research Networks program. The authors also cordially appreciate the kind contributions of Marc Demers and Alex Loignon in realizing the experiments and consequently reviewing and editing the manuscript.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 3 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 5, 2016
Accepted: Sep 28, 2016
Published online: Nov 3, 2016
Published in print: Mar 1, 2017
Discussion open until: Apr 3, 2017
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