GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 The structural response As we are interested in modelling the real interactions between the bricks in case of an earthquake, a Discrete Element Method (DEM) modelling of the structure has been used. This was implemented in a custom software within the physics library of ProjectChrono (Tasora A. et al., 2022). The contact between the bricks is modelled by means of local contact points characterized by a spring-dashpot unilateral interaction, considering Coulomb's friction law for the resistance to tangential slippage. The corresponding parameters in the software are referred to as "compliance" (contact spring), "damping" (contact dashpot), and "friction" (Coulomb's frictional coefficient); the adopted values, calibrated according to Boni and Royer-Carfagni (2023), are collected in Tab. 2, together with the type of solver, the iteration threshold and the time step for numerical integration. Tab. 1. Adopted densities for the materials forming the investigated structure. tuff bricks 1600 kg/m 3 stone columns and capitals 2700 kg/m 3 main roof beams 2000 kg/m 3 glass-based bracing 2500 kg/m 3 Tab. 2. Adopted parameters used for the numerical simulations with the DEM software. solver Barzilai-Borwein iterations 1000 time step 1×10 -3 s compliance 5×10 -9 m/N damping 7×10 -2 kg/s friction 0.5