Influence of Dampers on Seismic Response of Cable-Supported Bridge Towers
Publication: Journal of Bridge Engineering
Volume 12, Issue 3
Abstract
Nonlinear time history analyses were performed to investigate the seismic response of the new San Francisco–Oakland Bay Bridge East Span self-anchored suspension (SAS) bridge and cable-stayed (CS) bridge alternative with the signature towers protected by friction dampers and viscous dampers in lieu of the as-designed steel shear links. Response of the damper and shear link equipped towers were compared to determine if equipping bridge signature towers with passive dampers, that would not experience residual deformations, is a viable option for cable supported bridges, particularly in retrofit applications. Viscous dampers were the most beneficial to the SAS and CS tower response in the transverse direction of the bridges. Dampers placed in toggle-braced configurations further improved the tower response for the SAS bridge transverse direction by magnifying the damper displacement demands. With the addition of stiffness to the signature tower being more critical in the longitudinal direction than in the transverse direction, the diagonal friction dampers were the most beneficial in the longitudinal direction of the SAS bridge tower.
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Acknowledgments
Funding for this study was provided by the Department of Civil and Environmental Engineering at Washington State University. Professor Rodriguez-Marek’s assistance with forward directivity effects is greatly appreciated. Professor Frieder Seible and Professor Chia-Ming Uang of the University of California, San Diego, and Mr. Rafael Manzanarez, Dr. Marwan Nader, Mr. Laurent Rus, Mr. Jack Jara-Lopez, and Ms. Claudia Mibelli of TYLIN provided valuable insight into the new SFOBB East Span design. Dr. Athol Carr’s assistance in modifying RUAUMOKO 3D is greatly appreciated.
References
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 12 • Issue 3 • May 2007
Pages: 373 - 379
Copyright
© 2007 ASCE.
History
Received: Dec 17, 2004
Accepted: Dec 5, 2005
Published online: May 1, 2007
Published in print: May 2007
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