PSI - Issue 84

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ScienceDirect

Procedia Structural Integrity 84 (2026) 417–424

III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Long-Term Dynamic Monitoring for Structural Health Assessment of Bisantis Bridge Donato Fiore a *, Stefania Candela a , Francesco Mittiga a , Paolo De Lellis b

a Socotec Italia, Via Bariola 101-103, Lainate 2004, Italy b Move Solutions, Via Carlo Piaggia 382, Lucca 55100, Italy

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference Abstract This study presents the implementation of a long-term Structural Health Monitoring (SHM) system for the Bisantis Bridge, aimed at assessing its dynamic behavior and structural integrity. The SHM strategy combines terrestrial radar interferometry and wireless triaxial accelerometers to measure natural frequencies, modal shapes, and displacement patterns under operational traffic conditions. Radar-based Operational Modal Analysis (OMA), conducted with the IBIS-FS system, enabled the identification of key vibration modes by detecting sub-millimetric displacements. These results informed the optimal placement of synchronized SHM accelerometers, which provided detailed frequency and amplitude data over time. A Finite Element Model (FEM) of the bridge was developed in parallel to support the interpretation of monitoring data. Two models were created: one focusing on the main arch, and a full model including the deck and piers. Comparison with experimental results revealed that the FEM tends to underestimate natural frequencies, likely due to simplifications in mass and stiffness representation. Both radar and accelerometric measurements identified global and local modal frequencies, with observed variability within ±7-8%, primarily due to temperature and traffic conditions. The implemented SHM platform allows real-time data access through a web interface and has demonstrated that the Bisantis Bridge exhibits a generally symmetric structure with slight asymmetries in dynamic response. Frequencies exceeding 10% deviation from the mean are proposed as indicators of potential structural anomalies. The integration of radar, accelerometric data, and FEM analysis proves effective for long-term bridge assessment and provides a replicable methodology for similar infrastructure.

* Corresponding author. Tel.: +39 0825 24353. E-mail address: donato.fiore@socotec.com

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference 10.1016/j.prostr.2026.06.054