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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climate change, including wildfires and related soil erosion, and those deriving from an ever-increasing intensive use of the infrastructure, certainly different from that considered in the original projects. The bridges and tunnels present on the A3 highway have been classified into four macro groups (table 1). For bridges and viaducts belongings to 3rd macro group the inspections should be performed following the new LG20.

Table 1. Summary of classification, description, and quantity of the A3 highway assets for each macro group.

Macro groups

Classification

Description

Quantity

1 2 3

Manholes (L<6m)

Manholes

27

Bridges, Overpasses, and Underpasses (L<6m)

Bridge and Underpass Bridge and Viaduct

120 207

Bridges and Viaducts (L>6m)

4a 4b

Tunnels (L<200m) Tunnels (L>200m)

Tunnels Tunnels

10

4 Different materials, construction age, static schemes, and dimensions characterize these bridges. Table 2 and 3 provide insight into the AINOP classifications and year of construction for the 207 analyzed bridges. In terms of materials, there is a predominance of concrete bridges, of which 38% made of prestressed concrete and 46% reinforced

concrete, while the remaining 16% are made of steel. Table 2. AINOP Classification of the bridges in Macro group 3. AINOP Classification Percentage Overbridge 24% Bridge 23% Underpass 2% Underbridge 26% Overpass 7% Viaduct 18%

Table 3. Year of construction of the bridges in Macro group 3. Year of Construction Percentage Before the 1945 24% Between 1945 and 1980 23% After the 1980 2%

3. Surveillance Process The joint activities started in 2020 with the aim to support the managing body in the application of the ordinary method for overall the surveillance of highway assets, to develop an efficient and integrated BMS and to implement the new methodology presented with the LG20. Surveillance activities, until the end of 2023, had been structured into two distinct categories: (A) Scientific Support and Applied Research, and (B) Surveillance and Inspection Activities. Activity (A) provided multidisciplinary tasks and experimentations that involving many experts in several scientific disciplinary sectors belonging to the CUGRI, with the scope of applying the LG20 multilevel approach, up to Level 2. Instead, Activity (B) pertained the application of surveillance processes themselves, according to the mandatory regulatory framework governing the infrastructure assets. In particular, from 2020 to 2023, the developed activities involved: • The training of managing body staff, other affiliated companies responsible for verification and management processes and young engineering; • The creation of a Bridge Management System (BMS) platform to facilitate LG20 implementation and bridges management; • Research to develop new criteria for achieving the Level 3 (L3) goals outlined in the Guidelines, employing innovative monitoring methods to prioritize tasks in a sustainable manner; • The revision of the "Manual of Surveillance Management for the A3 highway Naples-Pompeii-Salerno"; • On-site inspections of the assets conducted by specialized inspectors formed and coordinated by the CUGRI, according to the new LG20 for all the infrastructure of macro-group 3 (implementation of Level 1 – L1) within June 2023; • Attention Class assessment for all the infrastructures of macro-group 3 (implementation of Level 2 – L2) within June 2023.