PSI - Issue 62

18 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 3 2. Site Context and Project Goals The A3 highway, extending over 52 kilometres, constitutes a segment of the European route E45 and connects the A1 “Autostrada del Sole” (northern and central Italy) with the A2 “Autostrada del Mediterraneo” (s outhern Italy). The A3 highway is the public road that changed the economic development of the Campania region (Italy) after the Second World War. It also plays a relevant socio-economic role, and in the development of the tourism sector, of its cultural landscape (historical panorama) for the crossed areas, such as the case of Salerno’s city and because it is an access point for UNESCO sites of the Amalfi Coast, Pompeii, and the Neapolitans heritage. The management of the highway is presently entrusted to SIS-SPN, which recently assumed responsibility from SAM. The A3 includes a total of 368 bridges, tunnels, and minor constructions, of which 207 bridges should be supervised according to the LG20 (Figure 1). The bridges are characterized by different features in terms of material, age of construction, structural typology, dimensions, etc.

Fig. 1. Bridges and viaducts (red circle) on the A3 highway (blue line).

The A3 highway develops in a very complex environment, which is characterized by elevated multi-risks and multi hazards. Naples and the surrounding territory are located in an area affected by high volcanic risk related to the presence of the Somma-Vesuvius and the Campi Flegrei active volcanic complex. Instead, Salerno and the Agro Nocerino-Sarnese areas are characterized by very high hydrological hazard, as demonstrated by the catastrophic events of Nocera (1997 and 2005), Sarno (1998) and Salerno (1954). Moreover, the overall highway is situated in a widely recognized seismo-tectonic and seismo-volcanic context related to the Apennine faults (Locati M et al, 2022) and most of the infrastructures are located near the sea, where wind and corrosion phenomena are accentuated, generating more pronounced degradation of the materials. In addition, it is also necessary to take into account the risks related to 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. In this context, since 2020, CUGRI and SAM started a joint activity of Applied Research in 2020 to develop an innovative approach to support the management of infrastructures located in multi-hazard and complex areas, based on academic research implementation in management best practices for local technicians’ formation for increasing governance capacity. The main goals of the project shared also by the current managing corporation SIS-SPN are: • The development of an asset catalogue consistent with the representations required by the standards, such as ISPRA catalogue [CARG project] and BIM modelling [Ministry of Infrastructure and Transport (2017)]), and with the regulations related to the hazards that the crossed territories are interested, such as seismic (NTC2018), hydrogeological (Flood and Landslide Risk Management Plan [PSAI]) and volcanic; • The creation of a multidisciplinary inspection model consistent with the ASPI manual [ASPI (2020)] in use, with the results and the AINOP vision, and compatible with the studies and activities already in place for the LG20. In particular, maintaining the speed of the inspections, the model aims to integrate the state of deterioration recognition with a qualified analysis of the deterioration effects on the safety conditions and formal and scientific validation of the results; • The training of young engineers to carry out inspection activities and maintenance process management; • The support in the managing corporation’s management processes with risk analyses based on multidisciplinary approaches, also through further agreements with the corporations and other managers present in the area.