Near-Real-Time Identification of Seismic Damage Using Unsupervised Deep Neural Network
Publication: Journal of Engineering Mechanics
Volume 148, Issue 3
Abstract
Prompt identification of structural damage is essential for effective postdisaster responses. To this end, this paper proposes a deep neural network (DNN)–based framework to identify seismic damage based on structural response data recorded during an earthquake event. The DNN in the proposed framework is constructed by Variational Autoencoder, which is one of the self-supervised DNNs that can construct the continuous latent space of the input data by learning probabilistic characteristics. The DNN is trained using the flexibility matrices obtained by operational modal analysis (OMA) of simulated structural responses of the target structure under the undamaged state. To consider the load-dependency of OMA results, the undamaged state of the structure is represented by the flexibility matrix, which is closest to that obtained from the measured seismic response in the latent space. The seismic damage of each member is then estimated based on the difference between the two matrices using the flexibility disassembly method. As a numerical example, the proposed method is applied to a 5-story, 5-bay steel frame structure for which structural analyses are first performed under artificial ground motions to create train and test datasets. The proposed framework is verified with the near-real-time simulation using ground motions of El Centro and Kobe earthquakes. The example demonstrates that the proposed DNN-based method can identify seismic damage accurately in near-real-time.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the first author upon reasonable request.
Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2021R1A2C2003553). The corresponding author is supported by the Institute of Construction and Environmental Engineering at Seoul National University.
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Published In
Journal of Engineering Mechanics
Volume 148 • Issue 3 • March 2022
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/.
History
Received: Jun 6, 2021
Accepted: Oct 9, 2021
Published online: Jan 10, 2022
Published in print: Mar 1, 2022
Discussion open until: Jun 10, 2022
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