PSI - Issue 62

Luigi Petti et al. / Procedia Structural Integrity 62 (2024) 16–23 Petti L, Montuori R, Lupo C, De Gaetano CM, Guida D, Loncarevic D and Repetto E / Structural Integrity Procedia 00 (2019) 000 – 000 7

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by interdisciplinary contributions such as geological, geomorphological, and geotechnical knowledge, adopting shared methodologies assessed in the regional academic framework, the CUR_CIS2020 (Aversa S and Guida D., 2021).

Fig. 6. Structural and foundational CdA and overall CdA forecast using the LG20 approach.

Even if the LG20 approach, unlike the ordinary inspection method, allows for a more detailed identification of defects, the overall preliminary obtained results seem to be too conservative with respect to the recorded defectiveness and the local hazard conditions, taking into account an expert judgment. 5. Conclusions This paper has focused on the application of the LG20 Guide Lines in terms of surveillance activity by describing a new methodology 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 to assure robust evaluations through expert judgments and the training of young specialists. The surveillance model considers a BMS capable of integrating GIS, BIM, and Risk representations within the CUGRI Information System. The obtained results lead to the following preliminary considerations: • The methodologies based on the LG20 and the CUGRI ordinary inspections led to similar results in terms of high defectiveness level, i.e., defect score, even if with different efforts both for time and economic resource requirements. Instead, the LG20 detailed analysis allows to better subdivide the medium levels from the low ones and it leads to a more detailed defect identification of the single structural components, compared to the ordinary inspections. • In the LG20 approach, local hazard conditions 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. • In the case of the LG20, the local hydro-geomorphological and geotechnical hazard conditions were the most relevant in the overall CdA assessment. The experimentation carried out highlights the need to develop more insights studies to better calibrate the LG20 model, based on the approach for class and logical operators, to evaluate the overall CdA. In fact, the research and adoption of new criteria for the implementation of Level 3 goals and the use of innovative monitoring methodologies to classify priorities appears inevitable, in order to develop more sustainable surveillance and maintenance plans. Moreover, it is relevant to highlight that while the road managing bodies are directly involved in the maintenance of the structures, natural hazard conditions could need the engagement of territorial entities in the overall risk

management process. Acknowledgements

The research was conducted thanks to the willingness to develop innovative surveillance processes and young specialists to allow fruitful maintenance process of road infrastructures in complex areas by the A3 managing corporations (SAM and SIS-SPN). The activities were conducted and led by the CUGRI.