Regional Conference on Permafrost 2021 and the 19th International Conference on Cold Regions Engineering
Performance of Bridges in Cold Regions with Sliding Seismic Isolation Bearings
Publication: Permafrost 2021: Merging Permafrost Science and Cold Regions Engineering
ABSTRACT
Effects of extreme temperature on highway bridges in cold regions seismically isolated with sliding type bearings are investigated. The critical factor in consideration is the change in the performance of isolation bearings with significant variation in temperature between seasons. The sliding bearing behavior is characterized by the friction coefficient of the sliding surfaces. The friction coefficient during a seismic motion varies with the sliding velocity and temperature at the sliding surface. Tests associated with past applications have indicated a marked increase in the value of friction coefficient resulting in higher stiffness of bearings at very cold temperatures. The effects of change in bearing stiffness on the seismic performance of the bridge in general and the substructure in particular are demonstrated here. This study aims to capture the change in bearing response and subsequently the overall structural response considering a temperature variation between −40°C and +40°C. Response parameters considered for this study are the base shear in the piers, the acceleration of the bridge deck, maximum and residual displacement of the isolation bearings, as well as the energy dissipation capacity. The response parameters are compared for individual ground motions as well as the mean and coefficient of variation (COV). It is observed that the higher bearing stiffness at extreme cold temperature leads to additional forces on the substructure which reduces the margin of safety and hence should be considered carefully in design.
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ACKNOWLEDGMENT
The Natural Sciences and Engineering Research Council (NSERC) of Canada through the Discovery Grant supported this study. The financial support is greatly appreciated.
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Permafrost 2021: Merging Permafrost Science and Cold Regions Engineering
Pages: 151 - 162
Editor: Jon Zufelt, Ph.D., HDR Alaska
ISBN (Online): 978-0-7844-8358-9
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© 2021 American Society of Civil Engineers.
History
Published online: Oct 21, 2021
Published in print: Oct 21, 2021
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