PSI - Issue 64

Carmine Lupo et al. / Procedia Structural Integrity 64 (2024) 645–652 Lupo C., Petti L. & De Gaetano C.M. / Structural Integrity Procedia 00 (2019) 000 – 000

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expected loads, material, length, number of spans and medium daily traffic (TGM). The results highlight the strong influence of Structural and Foundational CdA on the higher values of the Overall CdA, having approximately the same percentage of bridges (37% and 39% respectively). The latter implies that the Overall CdA may be a useful indicator for estimating the attention level required for each bridge. However, it may be necessary to consider the Defectiveness Level to determine maintenance priorities and the Seismic CdA to define the best intervention/retrofit strategy for each structure.

Fig. 4. Defectiveness Level and CdAs evaluated according to LG20 requirements. In order: Defectiveness Level (Level 1-LG20), Structural and Foundational, Seismic and Overall CdAs (Level 2-LG20).

Particular attention should also be paid in the assessment of landslide and hydraulic CdAs. Figure 5 shows the results related to high/high-medium levels for Hydraulic, Landslide and the combo Hydraulic and Landslide CdAs, resulting from the application of L2. As is possible to see in the figure, the combination matrix provided by LG20 tends to reduce the hydraulic and landslide risks if they are not simultaneously present. In fact, in the case of A3 highway, the first segment located in the Neapolitan area is essentially affected by hydraulic risk, instead the last one, toward Salerno, is substantially affected by landslide risk. Therefore, in such cases, the LG20 approach underestimates the influence of the single hazardous conditions that can often be independent of each other. Lastly, the obtained results show that local hazard conditions, such as hydro-geomorphological and geotechnical ones, played a more substantial role in the Overall CdA evaluation for medium and low levels, instead the structural and foundational CdA more influence for higher values.

Fig. 5. Comparison between High and Medium-High attention level for Hydraulic, Landslide, Hydraulic and Landslide CdAs evaluated according to LG20 requirements. 5. Conclusions This paper has focused on the application of the LG20 in terms of surveillance activity on the A3 highway (Southern Italy) thanks to a joint applied research project between the CUGRI and the managing bodies (SAM and SIS-SPN). The project developed a multidisciplinary-based model capable of dynamically managing a bridge database to support risk assessment activities, according to the current standard requirements. Within this, an innovative surveillance process was tested and applied to assure robust evaluations through expert judgments and the training of