InSAR for structural health monitoring of bridges: potentialities and open questions - EUROSTRUCT

by EuroStruct 2018
4 weeks ago
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Short Bio
Associate Professor of Structural and Seismic Engineering at Politecnico di Milano. She received her PhD in Seismic Engineering at Politecnico di Milano. She leads the SPM3 – Structural Performance Modeling, Management and Monitoring – research group focused on vibration-based and InSAR monitoring, Value of Information of SHM, and Vibration-based monitoring. She is an active member with leading roles in committees and associations in the field of SHM and structural engineering (among others IABSE, SCSHM, fib, and JCSS) and serves on the editorial board of several international peer-reviewed journals including SHM, Journal of Civil SHM, Engineering Structures, and ASCE Journal of Bridge Engineering. She coordinates, or participates in leading roles, in several EU and national projects on Structural Health Monitoring and performance assessment of civil structures and infrastructures.


Abstract
Considerable research has been carried out in the past 20 years in SHM-supported civil infrastructure management. Still, a gap exists between research and practice due to limited resources that often hamper the deployment of traditional SHM contact sensing systems on all the elements (e.g. bridges, viaducts, tunnels) of a transportation network. Synthetic Aperture Radar Interferometry (InSAR) is a well-established monitoring technology, widely used to study geophysical processes such as land deformations. Recently, thanks to the development of Multi-Temporal InSAR (MT-InSAR) technique, to the growing number of satellites, to the reduction of their revisiting time, and to the higher resolution of radar images, the temporal and spatial resolution of InSAR data has considerably increased. This enables to extend the use of the InSAR technology to the measurement of deformations for civil engineering artifacts -such as individual bridges – at the same time facilitating the coverage of large transportation networks. Furthermore, due to the availability of data relevant to past periods, MT-InSAR data allows for studying the past behavior of the infrastructure, potentially identifying ongoing deterioration trends. Since 2019 in the context of a Reluis National project, several Italian research groups have been investigating the potentialities of InSAR data for monitoring different types of structures. In the context of this project, the ‘Guidelines for the use of satellite interferometric data for the interpretation of the structural behaviour’ have been very recently published. The focus of the document is on the identification of potentialities and criticalities in the use of InSAR for buildings, bridges, and cultural heritage artifacts. This talk will present the main aspects and potentialities of the InSAR technology, open questions, and some applications with a specific focus on bridges.

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