PSI - Issue 62

Matteo Castellani et al. / Procedia Structural Integrity 62 (2024) 193–200 Matteo Castellani / Structural Integrity Procedia 00 (2019) 000 – 000

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the post-processing phase of the acquired data, it is crucial to merge them together to enhance the accuracy of the overall model.

a)

b)

Fig. 2. Predefined trajectories for surveying a box-girder bridge using a UAV: (a) survey of the pier; (b) survey of the superstructure.

Fig. 3. Predefined trajectories for surveying a box-girder bridge using a TLS.

3. Case study To test the proposed approach, a real bridge has been selected as the case study. The selected bridge, shown in Fig. 4 and located in Central Italy, is a cast-in-place reinforced concrete bridge with seven spans. The structural system features a frame configuration with Gerber cross girders. The total length of the bridge is 210 meters, with a maximum span length of 31 meters. The deck consists of a multi-cellular box girder with a trapezoidal cross-section. The larger base, forming the roadway platform, spans a length of 13.0 meters, while the soffit of the deck measures 10.70 meters in length. The deck has a midspan height of 3.15 meters, tapering towards the sides to reach a height of 2.90 meters. The box girder has a thickness of 25 centimeters and is longitudinally stiffened by four partitions (two internal and two lateral), each with a thickness of 40 centimeters and a height of 2.50 meters. The bridge deck is supported by 7 piles, varying in height based on the terrain elevation, with a maximum height of 12.1 meters. These piles, constructed