PSI - Issue 62

Luigi Petti et al. / Procedia Structural Integrity 62 (2024) 16–23 4 Petti L, Montuori R, Lupo C, De Gaetano CM, Guida D, Loncarevic D and Repetto E/ Structural Integrity Procedia 00 (2019) 000 – 000

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To achieve these goals, a development program has been defined. In particular, in addition to the application of LG20 to bridges and viaducts with a length greater than 6 m, the project involves the application of LG22 [Ministry of Infrastructure and Transport (2022)] to tunnels, and the surveillance of minor structures, such as manholes, bridges and viaducts with a length of less than 6 m, plants a nd signage, following the already developed “Assessment Manual 2020” developed by CUGRI according to SIS-SPN management rules. In the manual, all the infrastructures have been grouped into four macro groups as reported in Table 1. Table 1. Summary of classification, description, and quantity of the A3 highway assets for each macro group. Macro groups Classification Description Quantity 1 Manholes and Tunnels (L<6m) Manholes 27 2 Bridges, Overpasses, and Underpasses (L<6m) Bridge and Underpass 120 3 Bridges and Viaducts (L>6m) Bridge and Viaduct 207 4 Tunnels (L>6m) Tunnels 14 The surveillance activities are implemented through two different strategic activities: (A) Scientific Support and Applied Research, and (B) Surveillance and Inspection Activities. Activity (A) provides multidisciplinary tasks and experimentations that involve many experts in several scientific-disciplinary sectors belonging to the CUGRI, with the scope of applying the LG20 multilevel appro ach, up to Level 2. In particular, the plan’s main goals are: • The training of the managing staff, or other group companies, who are responsible for the verification and management processes. • The development of a BMS platform to support the LG20 application. • Research for new criteria to implement the Guidelines Level 3 aims, through innovative monitoring methodologies to classify the priorities in a sustainable way. • The comparison of the results obtained with the LG20 (Levels 1 and 2) and the previous approach. • The revision of the “Manual of Surveillance Management for the A3 highway Naples -Pompeii- Salerno”. Activity (B), instead, involves the surveillance itself, in compliance with the mandatory regulatory context for the Assets that make up the infrastructure assets. In particular, the main goals of this plan are: • Inspections according to the new LG20 for all the infrastructure of macro-group 3 (implementation of Level 1) within June 2023. • Attention Class assessment for all the infrastructures of macro-group 3 (implementation of Level 2) within June 2023. • On-site inspections of the assets, conducted by specialized inspectors formed and coordinated by the CUGRI. 3. The methodological framework for bridge surveillance The inspection and monitoring activities are implemented through an integrated operational model (Figure 2) aimed at guaranteeing the dynamic quality control of the inspection process, the congruence of the surveillance results’ description, and the correctness and homogeneity of the interpretation related to the degradation phenomena observed. The methodological model of surveillance is briefly described by the flowchart in Figure 2. The adopted operating model involves a full collaboration and parallel work of the managing body and CUGRI staff. Each involved resource has a well-defined task, in full compliance with the decision-making levels. As regards the managing body, the involved resources are: • Head of Surveillance (HS) and Contract Manager (CM) that manage the surveillance process. • Technical Contact (TC) and Contact person for safety aspects (CSA). • Internal Inspectors (IT) and Internal Staff offices (traffic-TO, mobility-MO, maintenance-MAO, etc.) that collaborate for the development of the surveillance activities. As regards the CUGRI, the involved resources are: • Legal Manager (LM) and Scientific Manager (SM) that manage the project according to the HS and CM advice. • Technical Contact (TC) and Contact person for safety aspects (CSA). • Scientific Coordinator (SC) that manages the overall inspection evidence and results, and plans the inspection activities for each quarter, specifying them every two weeks.