PSI - Issue 84

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ScienceDirect

Procedia Structural Integrity 84 (2026) 183–190

© 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 Keywords: Operational Modal Analysis; Structural Health Monitoring; Concrete bridge; Half joints; Gerber saddles; Strengthening Abstract Structural Health Monitoring (SHM) plays a crucial role in the assessment and management of ageing infrastructure and enables the continuous observation of structural behaviour and early detection of anomalies. Among SHM techniques, Operational Modal Analysis (OMA) is particularly effective for in-service bridges, as it allows the identification of modal parameters without requiring controlled excitation, with a minimum intrusiveness and a high global assessment capability. The present work focuses on the dynamic identification of a road bridge located in central Italy and composed by four spans featuring six Gerber-type half-joints. Over time, the bridge has undergone major structural alterations, such as reinforcement and potential stiffening of half-joints, which have modified its global dynamic behaviour. The dynamic response of the structure was analysed over several months by using a continuous vibration-based monitoring system, which includes almost 30 MEMS accelerometric channels analysed via advanced OMA techniques implemented through the “P3P” software suite. This work presents the proposed monitoring strategy and analyses the collected monitoring data with the aim of identifying the main effects of the structural interventions and the outcomes of long term dynamic response tracking. III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Vibration-Based Structural Health Monitoring of a Multi-Span Bridge with Gerber-Type Half Joints Francesco Nigro a *, Elisa Tomassini b , Filippo Ubertini b , Enzo Martinelli a a University of Salerno, Via Giovanni Paolo II, 132, Fisciano (SA), 84084, Italy b Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti, 93, Perugia (PG), 06125, Italy

* Corresponding author. Tel.: +39-089964342. E-mail address: fnigro@unisa.it

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.2026.06.025