GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 2.2 GNGTS 2024 Fig. 1– (a) Numerical model in SAP2000 and (b) Displacement Time-History from a natural earthquake. Tab. 1 – Input material proper9es. To assess the effect and potenCal of the seismic isolaCon system, the “fixed” model was modified by introducing a set of linear links with specific sCffness components. In addiCon, the posiCon of the lower constraints was changed by assuming that the façade is supported at the base. The linear links in use for the isolaCon system are characterized by two different sCffness values in the three translaConal direcCons. For the present invesCgaCon, the isolator is assumed to be rigid along the direcCon of the link (i.e., the Fixed opCon of SAP2000 is used). The sCffness in the other two direcCons is calculated following the design approach for rubber seismic isolators. Specifically, given the period of the isolated system, , the sCffness of the isolaCon system is given by : Where is the total mass of the GCW. The sCffness of the isolator is thus calculated as follows : (a) (b) Material Density [kg/m 3 ] Modulus of elasCcity [MPa] Poisson’ coefficient [-] Aluminium (6060 T5) 2700 70,000 0.3 Annealed glass 2500 70,000 0.23 T isol k isol = ( 2 ∙ π T isol ) 2 ∙ M M = 1880 kg (1) (2)