PSI - Issue 84

Alessandro Scala et al. / Procedia Structural Integrity 84 (2026) 489–496

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landslide hazards, whereas the post-inspection index incorporates field-based evidence of landslide–structure interaction. The approach is conceived to complement, rather than replace, the existing Guidelines, enhancing their operational effectiveness without modifying their regulatory structure. Application to representative case studies demonstrated that inspection-based information can significantly modify the relative priority of structures, either confirming the effectiveness of existing mitigation measures or revealing previously underestimated interaction mechanisms. Inspections therefore emerge as a decisive component of early stage decision-making, capable of reshaping risk perception and management priorities. The relatively higher weight assigned to post-inspection categories reflects a deliberate methodological choice, consistent with the defect-based logic adopted for structural condition assessment within the Italian Guidelines. As in structural inspections, inspection based indicators inherently involve a degree of subjectivity; however, this is mitigated by the use of predefined categories and scoring criteria, and by framing inspections as a refinement stage within a broader assessment process. From an infrastructure management perspective, the method supports adaptive, traceable, and resource-efficient prioritization strategies, particularly suited to large bridge inventories. The results indicate that moving beyond discrete classification schemes towards continuous, inspection-informed prioritization indices represents a practical step forward in the management of landslide risk for existing bridges. Acknowledgements This study was supported by FABRE – “Research consortium for the evaluation and monitoring of bridges, viaducts and other structures” (www.consorziofabre.it/en). Any opinion expressed in the paper does not necessarily reflect the view of the founder. We would like to thank Tecne S.p.A. for the financial support provided for the PhD scholarship of Alessandro Scala. Part of the work was made possible through funding for the PhD scholarship of Fabiola Gibin provided by the European Union - NextGenerationEU (National Recovery and Resilience Plan –NRRP, Mission 4 Component 1, Investment 4.1 – D.M. 118/2023, CUP C96E23000880001). References Brezzi, L., Carraro, E., Pasa, D., Teza, G., Cola, S., Galgaro, A., 2021. Post-collapse evolution of a rapid landslide from sequential analysis with FE and SPH-based models. Geosciences 11(9), 364. https://doi.org/10.3390/geosciences11090364 Di Marco, F., Tetougueni, C.D., Zampieri, P., Pellegrino, C., 2022. Numerical Analysis of Masonry Arch Bridges Subject to Scour Effect, in “ Proceedings of the 1st Conference of the European Association on Quality Control of Bridges and Structures. EUROSTRUCT 2021. Lecture Notes in Civil Engineering” 200. 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International Journal of Disaster Risk Reduction, 105880. https://doi.org/10.1016/j.ijdrr.2025.105880 Simeone, V., Doglioni, A., D’Ambrosio, G., Fiorentino, A., Nitti, D. O., Nutricato, R., Guerricchio, A., 2024. Nutcracker deformation of arch bridge in consequence of slow gravitational slope deformations. Procedia Structural Integrity 62, 561-568. https://doi.org/10.1016/j.prostr.2024.09.079