GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.3 GNGTS 2023 acquired by the open source GIS database available for Tuscany region (https://www502.regione.toscana.it/geoscopio/cartoteca.html) . The latter was used to get the initial shapefiles referred to the singular structural units, as to evaluate the historical evolution of the two centers. The period of construction of the buildings constitutes a useful information in order to relate every construction to an initial vulnerability class. Then, the specific modifiers explained in detail in Giovinazzi and Lagomarsino can be adopted to refine the vulnerability index of each building based on its features. The vulnerability curves have been related to the peak ground acceleration (PGA) of the area following the conversion formulation between macroseismic intensity and PGA adopting the coefficients provided by Margottini et al. (1992). The final derivation of the damage scenarios has been made considering a binomial probability distribution. Two distinct damage scenarios have been plotted, considering a damage limit state SLD and a life safety limit state SLV. Outcomes of the research and dissemination of the results The results of the study have been defined in terms of vulnerability indexes, vulnerability curves, fragility curves and damage scenarios. The outcomes point out a discrete homogeneity of the urban stock. In fact, most part of the structures has been subjected to relevant interventions targeted at defining box-behaviour masonry buildings. In many cases, RC ring beams have been realized at the connection of walls and slabs; in addition, refilling of the mortar joints of the masonry walls was evidenced by the site analysis. For this reason, the results in terms of vulnerability curves of Caprese Michelangelo and Valboncione point out similar trends (Fig. 2). In Fig 3, the results in terms of spatial GIS maps are shown. (a) (b)