Abstract
This work presents the first results obtained by applying in situ and remote-sensing methodologies to monitor the Ponte della Musica-Armando Trovajoli located in Rome, within the activities of the WP6 “Structural Health Monitoring and Satellite Data” 2019-21 Reluis Project. In particular, the use of remote-sensing Differential Synthetic Aperture Radar (SAR) Interferometry (DInSAR) measurements provided a spatial map of the displacement of the investigated infrastructure and the corresponding time-series, with the aim of monitoring deformation phenomena, focusing on the local scale analysis, which produces suitable results for urban monitoring and damage assessment. The DInSAR results have been integrated with the identification of the dynamic characteristics of the bridge, performed through an experimental campaign of ambient vibration measurements carried out in October 2020 and with the local-scale definition of the engineering geological setting of the foundation soil. The subsoil of the bridge is constituted by more than 50 m of recent alluvial deposits resting on Pliocene stiff clay acting as a geological bedrock. A substantially stable behavior of the bridge structural elements has been observed based on the analysis of both satellite and velocimetric data. This case represents a good example about how the integration of in situ sensors with remotely sensed data and the exploitation of a detailed knowledge regarding the on-site conditions represent a key factor for a sustainable structural and infrastructural monitoring and can support the planning both of maintenance and safety management.
Highlights
We focus on the above described first level of the observational chain, which combines the Differential Synthetic Aperture Radar (SAR) interferometry (DInSAR)
The more marked linear trends of lowering of the foundations observed over the time interval 2011–2019 are thought to be caused mainly by the overlapping of the settlement involving the underlying soft alluvial deposits and of the settlement of the stiff blue clay (Marne Vaticane formation) around the base of the piles
An experimental campaign has been planned within the 2019–2021 DPC-Reluis Project with the aim of setting up new protocols to merge information retrieved from satellite data and on-site vibrational measurements
Summary
Transport infrastructures need continuous maintenance due to deteriorations that may harm their serviceability and safety. These effects are the result of the combination of several factors, e.g., construction materials, quality of construction, traffic loads, and environmental factors. For this reason, it is necessary to carry out persistent monitoring of infrastructure health conditions in order to guarantee maximum safety at all times and support effective and economically sustainable maintenance. In the few years, the problem of the resilience of the built environment will become increasingly important as the buildings and infrastructures built in reinforced concrete in the 20th century are going to reach the end of their life.
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