Deep Learning–Based Retrofitting and Seismic Risk Assessment of Road Networks
Publication: Journal of Computing in Civil Engineering
Volume 36, Issue 2
Abstract
Seismic risk assessment of road systems involves computationally expensive traffic simulations to evaluate the performance of the system. To accelerate this process, this paper develops a neural network surrogate model that allows rapid and accurate estimation of changes in traffic performance metrics due to bridge damage. Some of the methodological aspects explored when calibrating this neural network are defining sampling protocols, selecting hyperparameters, and evaluating practical considerations of the model. In addition to the neural network, a modified version of the local interpretable model-agnostic explanation (LIME) is proposed as a retrofitting strategy that minimizes earthquakes’ impact on the system. The modified version (LIME-TI) uses traffic impacts (TI) and rates of occurrence to aggregate the importance of individual damage realizations during the computation of variable importance. This study uses the San Francisco Bay Area road network as a testbed. As a conclusion of this study, the neural network accurately predicts the system’s performance while taking five orders of magnitude less time to compute traffic metrics, allowing decision-makers to evaluate the impact of retrofitting bridges in the system quickly. Moreover, the proposed LIME-TI metric is superior to others (such as traffic volume or vulnerability) in identifying bridges whose retrofit effectively improves network performance.
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Data Availability Statement
Some data, models, or code generated or used during the study are available in a repository online in accordance with funder data retention policies, which can be found in: DOI 10.5281/zenodo.5161259.
Acknowledgments
The State of California supported this work through the Transportation System Research Program of the Pacific Earthquake Engineering Research Center (PEER) and by the Shah Family Fund Fellowship. Some of the computing for this project was performed on the Sherlock cluster. The authors would like to thank Stanford University and the Stanford Research Computing Center for providing computational resources and support that contributed to these research results. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the funding agency.
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© 2021 American Society of Civil Engineers.
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Received: Aug 5, 2021
Accepted: Oct 15, 2021
Published online: Dec 15, 2021
Published in print: Mar 1, 2022
Discussion open until: May 15, 2022
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