PSI - Issue 78

Manuel Capogna et al. / Procedia Structural Integrity 78 (2026) 1064–1070

1069

Following an international design-build competition won by the Italo-Argentine consortium Techint-Albano, and based on a design by the Italian engineer Fabrizio de Miranda, the bridges were constructed between 1972 and 1977. They were opened to traffic on December 14, 1977. These structures are notable as the first large-span cable-stayed road and rail bridges ever built worldwide. Each bridge features a 550-meter suspended deck (total length), with a 330-meter central span. The pylons reach a height of 110 meters, and the deck has a thickness of 2.6 meters (Baglietto et al., 1976; De Miranda et al., 1965). The integration of dynamic identification techniques and the concept of 'Digital Twins' further strengthens the proposed methodology. Operational Modal Analysis (OMA) can be employed to extract dynamic parameters— natural frequencies, damping ratios, and mode shapes—from the structure’s operational response. These parameters can be compared with those predicted by a Finite Element Model (FEM). In the event of an anomaly or a seismic event, variations in the dynamic response may indicate structural damage. Through 'model updating'—the calibration of the FEM using real-world data—it becomes possible to estimate the extent of damage by quantifying reductions in stiffness in specific structural zones. This enables the recalibration of accelerometric thresholds, providing an adaptive and more realistic basis for triggering alerts that directly link structural behavior to attention classes. Such real-time or post-event assessments can be integrated into the segment based classification approach, refining the attention class of affected segments. 4. Conclusions and future developement This work has laid the groundwork for a software system aimed at assessing and managing infrastructural risk, conceptualized with a modular and scalable architecture designed to integrate various technical and managerial analysis functions. The proposed extension of the segment-based risk classification methodology from road tunnels to bridges represents a significant step forward in infrastructure assessment, shifting from a simplistic, structure wide attention class to a more granular, segment-specific evaluation. This approach addresses the limitations of current practices by enabling a detailed representation of risk distribution—particularly beneficial for long and complex viaducts exposed to heterogeneous environmental and structural conditions. The practical evaluation, conducted through custom-programmed Microsoft Excel spreadsheets, demonstrates the feasibility and utility of this methodology in simulating various risk scenarios and calculating segment-specific attention classes. While the current tool supports qualitative assessment, its lack of predictive algorithms and machine learning capabilities limits its ability to anticipate risk evolution and emerging degradation patterns over time. Integrating artificial intelligence models presents a technical challenge, but also a major opportunity to enhance the system's predictive capabilities. Finally, the existing user interface, designed for desktop use, needs to evolve into an intuitive and interoperable mobile platform to effectively support field operations and improve operational efficiency for infrastructure managers. These future developments will consolidate the system into a comprehensive digital platform, capable of integrating technical, managerial, and territorial dimensions for more informed and effective infrastructure management. References Baglietto, E., De Miranda, F., Casirati, M., Castoldi, A., Sammartino, R., 1976. Ponti Zarate-Brazo Largo: modelli matematici e strutturali del comportamento statico e dinamico. Costr. Met. 41976. Buratti, G., Celati, S., Cosentino, A., Gaudioso, D., Mazzatura, I., Morelli, F., Salvatore, W., 2022. The New Guidelines of Italian Ministry of Infrastructures for the Structural Risk Classification of Existing Bridges: Genesis, Examples of Application and Practical Considerations, in: Pellegrino, C., Faleschini, F., Zanini, M.A., Matos, J.C., Casas, J.R., Strauss, A. (Eds.), Proceedings of the 1st Conference of the European Association on Quality Control of Bridges and Structures, Lecture Notes in Civil Engineering. Springer International Publishing, Cham, pp. 835–844. https://doi.org/10.1007/978-3-030-91877-4_95 Calò, M., Scattarreggia, N., Mucedero, G., Monteiro, R., 2024. Development of a bridge rating tool for optimised multi-hazard life-cycle-based maintenance, in: Jensen J.S., Frangopol D.M., Schmidt J.W. (Eds.), Bridge Maint., Saf., Manag., Digit. Sustain. - Proc. Int. Conf. Bridge Maint., Saf. Manag. Presented at the Bridge Maintenance, Safety, Management, Digitalization and Sustainability - Proceedings of the 12th