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Open AccessArticle

Displacement Monitoring and Health Evaluation of Two Bridges Using Sentinel-1 SAR Images

1
School of Earth Sciences and Engineering, Hohai University, JiangNing District, Nanjing 211100, China
2
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Geomatics Division, Av. Gauss 7, E-08860 Castelldefels, Spain
3
Department of Earth Sciences, Section of Geophysics, University of Milan, Via Cicognara 7, I-20129 Milan, Italy
4
Key Laboratory of C&PC Structures of the Ministry of Education, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(11), 1714; https://doi.org/10.3390/rs10111714
Received: 2 August 2018 / Revised: 21 October 2018 / Accepted: 23 October 2018 / Published: 30 October 2018
Displacement monitoring of large bridges is an important source of information concerning their health state. In this paper, a procedure based on satellite Persistent Scatterer Interferometry (PSI) data is presented to assess bridge health. The proposed approach periodically assesses the displacements of a bridge in order to detect abnormal displacements at any position of the bridge. To demonstrate its performances, the displacement characteristics of two bridges, the Nanjing-Dashengguan High-speed Railway Bridge (NDHRB, 1272 m long) and the Nanjing-Yangtze River Bridge (NYRB, 1576-m long), are studied. For this purpose, two independent Sentinel-1 SAR datasets were used, covering a two-year period with 75 and 66 images, respectively, providing very similar results. During the observed period, the two bridges underwent no actual displacements: thermal dilation displacements were dominant. For NDHRB, the total thermal dilation parameter from the PSI analysis was computed using the two different datasets; the difference of the two computations was 0.09 mm/°C, which, assuming a temperature variation of 30 °C, corresponds to a discrepancy of 2.7 mm over the total bridge length. From the total thermal dilation parameters, the coefficients of thermal expansion (CTE) were calculated, which were 11.26 × 10−6/°C and 11.19 × 10−6/°C, respectively. These values match the bridge metal properties. For NYRB, the estimated CTE was 10.46 × 10−6/°C, which also matches the bridge metal properties (11.26 × 10−6/°C). Based on a statistical analysis of the PSI topographic errors of NDHRB, pixels on the bridge deck were selected, and displacement models covering the entire NDHRB were established using the two track datasets; the model was validated on the six piers with an absolute mean error of 0.25 mm/°C. Finally, the health state of NDHRB was evaluated with four more images using the estimated models, and no abnormal displacements were found. View Full-Text
Keywords: SAR interferometry; displacement monitoring; Sentinel-1; permanent scatterers; thermal dilation; health monitoring SAR interferometry; displacement monitoring; Sentinel-1; permanent scatterers; thermal dilation; health monitoring
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MDPI and ACS Style

Huang, Q.; Monserrat, O.; Crosetto, M.; Crippa, B.; Wang, Y.; Jiang, J.; Ding, Y. Displacement Monitoring and Health Evaluation of Two Bridges Using Sentinel-1 SAR Images. Remote Sens. 2018, 10, 1714.

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