GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 virtual populations are defined with the Monte Carlo method by varying geometric and mechanical features that most affect the OOP behaviour (wall thickness, story height, holes in façade and masonry compressive strength). The values of the geometric parameters are varied by assuming for each of them a lognormal distribution calibrated on the basis of the actual data of the building typologies, while the values of the masonry compressive strength are generated by considering a lognormal distribution with mean and standard deviation suggested by (CNR-DT212, 2014) for the masonry characterizing the typologies of the buildings under study. In the third step, for each building of each virtual population defined in the previous step, the response of the façade is evaluated in terms of capacity curve by adopting the nonlinear kinematic analysis (NTC, 2018; Circolare, 2019). In the analysis, the interaction effect among contiguous SUs is introduced (Cima et al., 2022). To this purpose, reference is made to the aggregate depicted in Fig. 1a, by assuming that the central SU is built in adherence with the adjacent SUs with which it shares the boundary wall. The interaction effect is introduced in terms of frictional forces acting on the interconnecting semi-blocks that connect the overturning façade wall both with the transversal walls, shared with the adjacent units, and with the lateral coplanar façade walls. Three possible types of interaction are examined: a) the overturning façade is connected only to the transverse walls and, consequently, the frictional forces act at the interconnection semi-blocks along these walls (in blue in Fig. 1b); c) the overturning façade is connected to the coplanar walls of the adjacent SUs through the so-called “ morse d’attesa” (in green in Fig. 2c); c) the overturning façade is connected both to the transverse adjacent walls and to the coplanar walls (Fig. 2d).