PSI - Issue 44

Andrea Nettis et al. / Procedia Structural Integrity 44 (2023) 1996–2003 Andrea Nettis et al. / Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 4. Results of the interferometry analysis for selected test bridges.

4. Conclusion This study investigates the use of satellite-based multi-temporal synthetic aperture radar interferometry (MTInSAR) for network-scale structural monitoring and preliminary structural assessment of bridges. This paper adopts a methodology for the practical and automatic use of displacement time series associated with persistent scatterers (PSs) on the terrestrial surface to recognise ongoing deformation phenomena affecting bridges in a given investigated area of interest. The methodology is implemented in a user-friendly geographical information system. A case-study highway network located in Roma is analysed by using Sentinel-1 and COSMO-SkyMed satellite data. The outputs are described in terms of spatial density of PSs and deformation scenarios With reference to the investigated case-study area, appropriate spatial coverage of PSs is observed on motorway bridges, while the PS density may decrease for bridges belonging to low-level roadways. The results discussed with reference to several case-study bridges can be used for the comprehensive development of an effective MTInSAR-based approach for bridge monitoring pushing towards a future efficient and safety-oriented management of roadway and railway networks. Acknowledgements The research presented in this paper is partially funded by the CONSORZIO FABRE in the framework of the agreement named “ Supporto tecnico-scientifico per lo sviluppo della metodologia per il censimento, ispezioni iniziali e individuazione delle Classi di Attenzione di un campione di ponti e viadotti gestiti da Anas Spa; prioritarizzazione delle operazioni di valutazione di livello 4; verifica della qualità e di omogeneità dei risultati ”. References Anisha, A., Jacob, A., Davis, R., & Mangalathu, S. (2022). Fragility functions for highway RC bridge under various flood scenarios. Engineering Structures , 260 (September 2021), 114244. https://doi.org/10.1016/j.engstruct.2022.114244 Bazzucchi, F., Restuccia, L., & Ferro, G. A. (2018). Considerations over the Italian road bridge infrastructure safety after the polcevera viaduct collapse: Past errors and future perspectives. Frattura Ed Integrità Strutturale , 12(46) , 400 – 421. https://doi.org/10.3221/IGF-ESIS.46.37 Bovenga, F., Nutricato, R., Refice, A., Guerriero, L., & Chiaradia, M. T. (2005). SPINUA: A flexible processing chain for ERS / ENVISAT long term interferometry. In European Space Agency, (Special Publication) ESA SP, ISSN: 03796566 (pp. 473 – 478).