PSI - Issue 44

F.C. Ponzo et al. / Procedia Structural Integrity 44 (2023) 854–861 F. C. Ponzo/ Structural Integrity Procedia 00 (2022) 000 – 000

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5. Discussion One of the mail goals of 2019 – 2021 DPC-Reluis Project was setting up new protocols to merge information retrieved from satellite data and on- site measurements. The “Ponte della Musica–Armando Trovajoli” bridge has been selected as a test site. In this paper, a preliminary discussion about the modal calibration of the numerical model of the bridge has been presented. Particularly, the numerical calibration was based on the minimization of the difference among retrieved experimental eigenfrequencies and numerical ones. The calibration process was mainly based on the variation of mechanical characteristics of external constrains (taking into account foundation-support devices-structure interaction). Mechanical and geometrical characteristics of the elements have been retrieved from the design documentation. Further analyses on the acquired data are necessary to evaluate experimental mode shapes and related equivalent damping factors. All these information will be used to improve the accuracy of the numerical model taking into account also this other kind of information and to better calibrate nonlinear boundary conditions. Once the calibration phase of the model has been completed, new numerical linear and nonlinear analyses will be performed in order to understand the amount of lateral and vertical displacement due to air temperature variations and solar radiation. The last goal will be to understand the possible role played by thermal effects on bridges and their correlation with the coherence of interferograms retrieved from satellite over time. 6. Acknowledgements The authors would like to acknowledge the Italian Civil Protection Department within the project RELUIS 2019 – 2021, WP6 “Structural Health Monitoring and Satellite Data” research line for funding the project and the Italian Space Agency (ASI) for CSK® Products, delivered under a license to use by ASI. 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