This paper proposes a method for outlier analysis of bridge deflections using satellite Synthetic Aperture Radar (SAR) and structural simulation based on the finite element (FE) analysis. The proposed method is unique in combining the following two points: (1) detecting anomalous displacement of bridges before a severe accident occurs using satellite SAR displacement analysis, and (2) attempting to estimate the factors anomalous responses on the bridge, such as damages on structural members, using FE analysis. This paper describes the results of the practical application of the proposed method to MUSOTA water pipe bridge in Japan, which collapsed on October 3, 2021.
bridge, maintenance, SAR, finite element analysis, outlier analysis
Cusson, D., Rossi, C., and, Ozkan, L. (2021). Satellite monitoring for early detection of excessive displacements on bridges, The 10th International Conference on Structural Health Monitoring of Intelligent Infrastructure.
Ferretti, A., Prati, C., and, Rocca, F. (2001). Permanent scatterers in SAR interferometry, IEEE Transactions on Geoscience and Remote Sensing, vol. 39, no. 1, pp. 8- 20, doi: 10.1109/36.898661.
The Japan Times (2021), 60,000 homes in west Japan city face water outage after pipe collapse. October 4, https://www.japantimes.co.jp/news/2021/10/04/national /water-outage-western-japan/
The Japan Society of Civil Engineers (JSCE) (2022). Investigation report on MUSOTA water pipe bridge collapse that occurred in October 2021 (in Japanese), https://www.jsce-kansai.net/wp-content/uploads/2022 /05/books_suikankyou_2021.10.pdf
Kinoshita, K., Kumura, T., Yamaguchi, Y., and, Tanaka, T. (2023). Anomalous Displacement Detection of Bridges Using Satellite SAR: A Case Study on a Collapse of MUSOTA Water Pipe Bridge, The International Geoscience and Remote Sensing Symposium (IGARSS).
Nishio, M., Marin, J., and Fujino, Y. (2012). Uncertainty quantification of the finite element model of existing bridges for dynamic analysis, Journal of Civil Structural Health Monitoring, Vol. 2, pp. 163-173, doi: 10.1007/s13349-012-0026-z.
Selvakumaran, S., Sadeghi, Z., Collings, M., Rossi, C., Wright, T., and Hooper A. (2022). Comparison of in situ and interferometric synthetic aperture radar monitoring to assess bridge thermal expansion, Proceedings of the Institution of Civil Engineers - Smart Infrastructure and Construction, Vol 175, Issue 2, pp. 73-91.
This work is licensed under a Creative Commons Attribution 3.0 Unported License.