PSI - Issue 84

Alessandro Pucci et al. / Procedia Structural Integrity 84 (2026) 433–440

438

The structure consists of two parallel, independent carriageways, each approximately 2.5 km long and composed of a multi-span girder system with about sixty spans per direction. The viaduct was constructed in the early 1990s using a predominantly precast reinforced and prestressed concrete solution, a common design approach for long linear motorway crossings of that period. The deck is supported by a series of slender reinforced-concrete piers founded on deep foundations, ensuring continuity of the motorway alignment across a morphologically complex valley. The structural layout reflects a modular and repetitive design.

Fig. 4. Data survey of the Viaduct.

As shown in Fig. 4, the proposed method was applied to the extensive UAV-acquired image dataset of the Viaduct. This enabled the creation of a detailed, digital model of the bridge components, providing a geometrically reliable framework for precisely detecting, locating, and quantitatively evaluating defects throughout the inspected structural elements. As shown in Fig. 5, the defects annotated on the images were positioned onto the 3D model of the bridge and subsequently assigned to the corresponding BIM elements. The case-study highly relied on the expertise and know-how of RINA inspectors, which actively contributed to the refinement of the digital solution.

Fig. 5. Identification of defects onto the 3D model of the case-study.