PSI - Issue 44

Gabriella Tocchi et al. / Procedia Structural Integrity 44 (2023) 1972–1979 Gabriella Tocchi et al./ Structural Integrity Procedia 00 (2022) 000–000

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also be classified based on their altimetry: (1) lowland if it is less than 300 meters above mean sea level (mamsl); (2) hill if it is between 300 and 600 mamsl; (3) mountain if it is more than 600 mamsl. It can be observed that irregular structures are mostly widespread in mountain areas.

Fig. 4. Diffusion of regular and irregular layout structures for different geographic areas identified based on the provincial administrative level (a) and the altimetric class (b). Considering the above observations, structural features may be assigned to buildings in a given municipality based on the administrative area and altimetric class. For example, concerning masonry buildings, the presence of irregular layout structures can be hypothesized as having low probability for municipalities in Caserta’s province and in altimetric class 1 (lowland); thus, in Frignano and in San Cipriano d’Aversa (30 and 20 mamsl respectively) it can be assumed that most buildings have good quality or regular layout. Similarly, through the statistical analysis of Cartis database, also the prevailing type of slabs may be derived: it can be observed that usually in buildings with regular vertical structure, flexible, semi-rigid slabs are almost equally widespread while vaults are not so common (27% flexible, 27% semi-rigid, 38% rigid and 8% vaults). Concerning tie roads and tie beams, an incidence of the 26% on this building typology (i.e., regular layout) can be considered.

Fig. 5. Comparison between building inventory compiled using the exposure model defined by average percentage occurrence of main vulnerability factors in Cartis database (Simulated classification scheme) and the one compiled using the original information of Cartis form (Cartis data) for the municipality of Frignano (a) and San Cipriano d’Aversa (b). Using these average percentages of occurrence, building inventory at HC level for the two analyzed municipalities is built. To this aim, classification rules proposed by Rota et al. 2008 for grouping buildings into vulnerability classes based on combination of vertical and horizontal structure type are adopted. Fig. 5 shows how the building inventory derived using the exposure model proposed herein differ by the one compiled using original information on prevailing building typologies reported in the Cartis form. It is worth noting that adopting the simulated classification scheme, only 18% and 5% of buildings are assigned to wrong vulnerability classes in Frignano and San Cipriano d’Aversa respectively.