PSI - Issue 64

Luigi Petti et al. / Procedia Structural Integrity 64 (2024) 629–636 Petti L., Zuchtriegel G., Lupo C., Calvanese V. & De Gaetano C.M. / Structural Integrity Procedia 00 (2019) 000 – 000

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• Detailed Assessment Level (DA): it is carried out punctually in response to the results of the LA and/or GA and provides in-depth assessments and resolves critical local issues with the support of monitoring devices. Figure 2 shows the flow chart of the proposed monitoring approach. In particular, it involves the development of GA and LA levels in parallel.

Fig. 2. Flow-chart of the developed Monitoring Approach. GA acquires a sufficient knowledge of the entire site, through the development of monthly drone surveys conducted by experts and the use of AI tools. In cases of emergency or major meteorological events, surveys can be conducted more frequently. LA acquires an extensive knowledge of the entire site, through on-site visual inspections of the heritage, conducted by teams of expert operators. The development of GA and LA facilitates solving most of the issues of decay identified by ordinary maintenance activities. In contrast, in the case of exceptional decay conditions resulting from dramatic events or critical conditions, maintenance managers may request the implementation of a DA level. The DA consists of specific in-depth assessments based on on-site survey, ad-hoc investigations and analysis conducted by teams of experts in the field of archaeology, architecture, engineering, restoration, etc. The assessment determines the maintenance strategy, which can also include implementing monitoring surveillance using sensors to improve the understanding of the situation or to delay the interventions for a sustainable management. 4. Local Assessment Level (LA) The Local Assessment Level (LA) is a comprehensive survey designed to gain extensive knowledge of the condition of the heritage. Its main objective is to identify critical issues affecting the archaeological remains, by applying Fragility Indexes, both in absolute and relative terms, to characterize all the elements of the site. LA is conducted annually and it is provided by means of efficient on-site surveys carried out by expert teams. It involves the use of a methodology based on compiling monitoring forms, which incorporate exhaustive categories for identifying the salient decay problems for each type of element. It considers a multilevel management approach aimed at providing a synthetic evaluation of the risk factors associated with the individual elements. This level aims to detect potential