Characterization of a Roller Seismic Isolation Bearing with Supplemental Energy Dissipation for Highway Bridges
Publication: Journal of Structural Engineering
Volume 136, Issue 5
Abstract
A new roller seismic isolation bearing is developed for use in highway bridges. This new bearing uses rolling of cylindrical rollers on V-shaped sloping surfaces to achieve seismic isolation. The bearing is characterized by a constant spectral acceleration under horizontal ground motions and by a self-centering capability, which are two desirable properties for seismic applications. The former makes resonance less likely to occur between the bearing and horizontal earthquakes, while the latter guarantees that the bridge superstructure can self-center to its original position after earthquakes. To provide supplemental energy dissipation to reduce the seismic responses, the bearing is designed with a built-in sliding friction mechanism. This paper presents the seismic behavior of the bearing through analytical and experimental studies. First, the acceleration responses of and forces acting on the bearing under base excitation are presented. Next, the governing equation of horizontal motion, the base shear-horizontal displacement relationship, and conditions for self-centering, for the rollers to maintain contact with the bearing plates, and for rolling without sliding are discussed. An experimental study on a prototype bearing was carried out to verify and calibrate its characteristics and the results are discussed.
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Acknowledgments
The writers gratefully acknowledge the Federal Highway Administration (FHWA) for funding the study reported herein (FHWA 094 Project No. UNSPECIFIEDDTFH61-98-C00094). The writers wish to express their sincere appreciation to Philip Yen and James Cooper from FHWA for their support, advice, and encouragement and to Andrew Whittaker and Michael Constantinou from the University at Buffalo for their valuable comments in the development of the bearing. In addition, the writers would like to thank Christopher Budden and Mark Pitman at the Structural Engineering and Earthquake Simulation Laboratory of the University at Buffalo for their help in the experimental study.
References
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© 2010 ASCE.
History
Received: Aug 7, 2008
Accepted: Sep 7, 2009
Published online: Oct 24, 2009
Published in print: May 2010
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