Damage-Based Capacity Limit States for Nonductile Bridge Columns
Publication: Journal of Bridge Engineering
Volume 28, Issue 5
Abstract
The ability to estimate, with reasonable accuracy, the likelihood and extent of damage to bridges following an earthquake is crucial to postearthquake response activities. While the development of seismic demand models has seen considerable progress, there is a significant gap in our current ability to correlate demands with capacity limit states, particularly for older bridges with nonductile detailing. A simulation model was developed for typical nonductile bridge columns considering potential failure modes and incorporating critical response effects at the material and sectional levels. A primary drawback in using ductility-based measures to characterize capacity limit states under random earthquake-induced loading led us to develop a damage index–based approach to classifying limit states. The proposed damage-based approach was validated against experimental data and then applied to single-column bridge bents. Fragility functions were developed by which the exceedance probabilities of damage states could be examined and median estimates used to develop damage-index ranges for each limit state. The findings from this study will not only assist in postearthquake emergency response efforts, but also in prioritizing the strengthening of older, nonductile bridges.
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Acknowledgments
The authors gratefully acknowledge the collaboration of, and input from, Cliff Roblee (Caltrans), Chuang-Sheng (Walter) Yang and Qiu Zheng (Georgia Tech) throughout the project. This work was supported by the Pacific Earthquake Engineering Research (PEER) Center under the Transportation Systems Research Program. The opinions, findings, conclusions and recommendations expressed in this publication are those of the authors and do not necessarily reflect those of PEER or the Regents of the University of California.
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Published In
Journal of Bridge Engineering
Volume 28 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 27, 2022
Accepted: Dec 3, 2022
Published online: Feb 21, 2023
Published in print: May 1, 2023
Discussion open until: Jul 21, 2023
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