Shake-Table Studies of a Four-Span Bridge Model with Advanced Materials
Publication: Journal of Structural Engineering
Volume 138, Issue 2
Abstract
As part of a major study on the seismic response of bridge systems with conventional and advanced details, a large-scale model of a 4-span bridge incorporating several innovative plastic hinges was recently tested on shake tables at the University of Nevada, Reno. The bridge model included six columns, each pair of which utilized a different unconventional detail at the bottom plastic hinges: shape memory alloys (SMAs), engineered cementitious composites (ECCs), elastomeric pads embedded into columns, and posttensioning tendons. The bridge model was subjected to two horizontal components of simulated earthquake records of the 1994 Northridge earthquake in California. More than 340 channels of data were collected. Test results showed the effectiveness of the innovative materials in reducing damage and permanent displacements. The damage was minimal in plastic hinges with SMA/ECC and those with built-in elastomeric pads. Conventional reinforced concrete plastic hinges were severely damaged because of spalling of concrete and rupture of longitudinal and transverse reinforcement.
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Acknowledgments
The study presented in this paper was funded by the U.S. National Science Foundation under the NEESR Grant Nos. NSFCMS-0420347, NSFCMMI-0650935, and NSFCMS-0402490. The support of the NSF program director, Dr. Joy Pauschke, is appreciated. The contributions of David Hillis in the design and construction of the bridge bents are also deeply appreciated. The authors would like to thank Dr. Kazuhiko Kawashima for providing information about columns with elastomeric pads and the AVAR-SAS Company for donating the posttensioning rods. The authors are also indebted to the staff of the structures laboratory at the University of Nevada, Reno, particularly Dr. Patrick Laplace, Dr. Sherif Elfass, and Mr. Paul Lucas. The dedicated assistance of the following UNR undergraduate and graduate students is also acknowledged: Amir Reza Shoja-Taheri, Sarira Motaref, Ashkan Vosooghi, Arash Esmaili Zaghi, and Austin Brown.
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Published In
Journal of Structural Engineering
Volume 138 • Issue 2 • February 2012
Pages: 183 - 192
Copyright
© 2012 American Society of Civil Engineers.
History
Received: May 28, 2010
Accepted: Jun 15, 2011
Published online: Jun 17, 2011
Published in print: Feb 1, 2012
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