PSI - Issue 62

Emerenziana Locatelli et al. / Procedia Structural Integrity 62 (2024) 209–216

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Author name / Structural Integrity Procedia 00 (2019) 000 – 000

Figure 1 – Level flux according to Guidelines (Santarsiero et al., 2021).

As explained in the article of Mazzatura et al. (2023), this new approach relies on the general philosophy of deepening the knowledge of structures the more they are prone to be damaged by different relevant sources of risks, to optimize the time and economical resources to invest. First three levels must be applied to all bridges (Levels 0 to 2), while the last three (Levels 3 to 5) only for the bridges which are characterised by high risk deriving from the analyses of the previous levels. Specifically, first three levels give a qualitative evaluation of the bridge, with the calculation of the Overall Attention Class in Level 2, which is the combination of four specific risks: structure foundation, seismic, hydraulic and landslide. The flux presents two main cycles based on the result of Level 2. Guidelines highlights the importance of guaranteeing continuous monitoring, since risk conditions advance and may get worst in time (MIMS, 2022). Consequently, the first cycle (Cycle 1) is the periodic assessment of the Overall Attention Class during the whole service life of the bridge, with a higher periodicity the worse is the classification. The second cycle (Cycle 2) occurs when detailed assessment procedures are required. In conclusion, in some cases, for bridge owner is sufficient to plan periodic ordinary and extraordinary inspections and maintenance interventions (Cycle 1), while in other case it is necessary, in addition, to proceed for deeper analysis with subsequent levels (Cycle 2). A third cycle (Cycle 3) requires the update of AINOP, the national digital archive concerning public structures and infrastructures, for each new evaluation of the Overall Attention Class. The need is to analyse data coming from all the owners for a massive management and for funding allocation where primarily needed (MIT, 2019). Following, the description of the three main actors involved in the global flow: • Technicians. They can include, as example, qualified inspectors for the calculation of Overall Attention Class, engineers for loads evaluation, expertizes in 3D scanning, laboratory technicians for destructive analysis. They are involved in all the Levels, offering their competence to the bridge owner; • Bridge owners. Generally, the administration of their infrastructural heritage is subdivided among the internal collaborators. The assignment is to guarantee security of structures. Consequently, they must plan short-term and long-term interventions, according to the cyclical value of Overall Attention Class calculated by qualified inspectors, proceed with next levels when required and transfer some of the census and inspection data to the Italian Ministry of Infrastructures. Bridge owners are involved at the