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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actual managing body Naples-Pompeii-Salerno S.p.A. (SIS-SPN), with the aim to apply an innovative methodology to manage the assets of A3 highway, located in an area susceptible to multiple hazards. The objectives of this collaboration are the development of a comprehensive asset catalogue that aligns with the requirements of established standards, the development of a versatile and multidisciplinary inspection model able to identify and describe the single components of bridges along the roads, according to the LG20 and AINOP requirements, the provision of training opportunities for young engineers, the support in the managing corporation’s management processes with risk analyses based on multidisciplinary approaches, also through further agreements with the managing bodies of the territories. The paper describes the methodology developed to support surveillance activities of the A3 highway road infrastructures, in accordance with LG20. It considers a BMS based on advanced BIM models, GIS representations, and ad-hoc management processes, enabling a qualified evaluation of bridge safety conditions founded on multidisciplinary approaches and expertise. The Surveillance Process is also uploaded and checked with an internal AUDIT implementation for a substantial and formal control of the overall strategies and documentation, see UNI EN ISO 19011:2018. 2. The A3 Highway The A3 highway is a segment of the European route E45 and connects the A1 "Autostrada del Sole" in northern Italy with the A2 "Autostrada del Mediterraneo" in the southern Italy. It extends for a total length of 52 kilometers and represents the link between the two more important urban agglomerate of the Campania Region, Naples and Salerno. The first section, Naples-Pompeii, was built on 22 June 1929, while the second section, Pompeii-Salerno, was completed on 16 July 1961. On that date, the highway had only two lanes in each direction. Only in 2004 was financed its modernization up to Castellammare di Stabia, which was finished in 2015, making this segment entirely three lanes. From a chronological point of view, most of the structures have exceeded 50 years of existence. In the section Naples- Castellammare di Stabia there are some structures dated at the beginning of the 1900s, and other built in the last twenty years. The highway management has passed from SAM to SIS-SPN, and it comprises a complex network of 368 structures, encompassing bridges, tunnels, and minor constructions, among which 207 bridges fall under the purview of LG20 surveillance guidelines (see Figure 1).

Fig. 1. Map of the A3 highway with the indication of the assets (left) and examples of typical bridges (right).

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