PSI - Issue 64

Donato Fiore et al. / Procedia Structural Integrity 64 (2024) 740–748 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Figure 8 – Amplitude in the Frequency domain.

Figure 9 – Example of dynamic acquisition on both the West and East sides of the bridge: (a) the range bins selected and the corresponding displacement on the west side, (b) the main frequencies detected on the west side, (c) the range bins selected and the corresponding displacement on the east side, (d) the main frequencies detected on the east side 4. CONCLUSION This project confirms the great potential and flexibility of terrestrial radar interferometry for the rapid analysis of the structural behavior of infrastructures, as already highlighted by a previous study conducted by Mazzanti et al. (2014). The survey provided detailed information on vertical deflections, vibration movement and vibration frequencies along the bridge structure surveyed, largely demonstrating the capabilities and accuracy of the system. Monitoring has been shown to be particularly useful for understanding the real structural behaviors in depth, revealing unknown factors that were not considered in design and providing structural information for necessary retrofits. In detail, the static monitoring validated the stability of the viaduct. The modal parameters (natural frequencies, modal shapes, and modal damping values) were obtained from the measured dynamic response induced by ambient excitation (Ambient Vibration Testing - AVT). These identified parameters were used to characterize the performance of the structure. Throughout the entire monitoring year, the bridge did not show any variations in terms of frequency.