Novel Isolation Device for Protection of Cable-Stayed Bridges against Near-Fault Earthquakes
Publication: Journal of Bridge Engineering
Volume 19, Issue 8
Abstract
This paper investigates the near-fault (NF) seismic performance of a novel isolation system, referred to as the roll-n-cage (RNC) isolator, considering the cable-stayed Bill Emerson Memorial Bridge in Missouri. The RNC isolator is designed to achieve a balance in controlling bridge displacement demands, structural accelerations, and internal forces in the tower attributable to horizontal seismic forces. It provides in a single unit all the necessary functions of rigid support, horizontal flexibility with enhanced stability, and energy-dissipation characteristics. Moreover, it has two unique features that are built-in: energy-absorbing buffer and linear recentering mechanisms. Through a nonlinear time history analysis under three recorded NF earthquakes and three synthetic ground accelerations, the results show that the RNC isolator is a convenient isolation system in protecting cable-stayed bridges against NF earthquakes.
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Information
Published In
Journal of Bridge Engineering
Volume 19 • Issue 8 • August 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 1, 2012
Accepted: May 9, 2013
Published online: May 11, 2013
Discussion open until: May 30, 2014
Published in print: Aug 1, 2014
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