PSI - Issue 62

Gallipoli Maria Rosaria et al. / Procedia Structural Integrity 62 (2024) 940–945 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusion We applied and validated a multimethodological approach using FSA, FDD, ANDI and NonPaDan to estimate the main modal parameters of the Gravina and Monticello bridges. It consisted of experimental non-invasive, non destructive and low-cost seismic measurements. The methods used allowed us to investigate the target infrastructure at multiple levels and depths. The bridges were monitored both in their overall behaviour and at specific key points. The main advantage of this experimental approach is that it uses seismic ambient noise data, which can be quickly and easily recorded using a low-cost, non-invasive seismic sensor array. No detours, traffic stops or interruptions to bridge use are required for the recordings. This approach was validated on two bridges that differ in typology and year of construction. For the Gravina bridge, the estimated structural characteristics represent the zero point of the infrastructure, which is important information to follow the evolution of the health state of the structure. For the Monticello viaduct, these estimates allowed some considerations to be made on the degree of degradation of the spans. The results of the analyses carried out on different datasets using different data analysis techniques are in very good agreement, thus confirming the robustness of the proposed approach. This knowledge is the core of SHM and constitutes the necessary input for: (1) definition of behavioural thresholds useful for the automatic detection of critical issues in the dynamic behaviour of the monitored bridge; (2) the monitoring of the performance of the bridge during operation to determine the best maintenance strategies. The presented approach could be the starting point for an innovative SHM paradigm to overcome the limitations associated with current approaches to inspection, assessment, maintenance and design of existing bridges. References Bindi, D., Petrovic, B., Karapetrou, S., Manakou, M., Boxberger, T., Raptakis, D., Pitilakis, K.D., Parolai, S., 2015. Seismic response of an 8-story RC-building from ambient vibration analysis. Bullettin of Earthquake Engineering, 13, 2095 – 2120. https://doi.org/10.1007/s10518-014-9713 y Borlenghi, P., Gentile, C., Zonno, G., 2022. Monitoring Reinforced Concrete Arch Bridges with Operational Modal Analysis. In: Pellegrino, C., Faleschini, F., Zanini, MA., et al (Ed.). Proceedings of the 1st Conference of the European Association on Quality Control of Bridges and Structures. Springer International Publishing, Cham, pp. 361 – 371. García-Macías, E., Ubertini, F., 2021. 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