GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 is the minimum VH ratio at periods larger than according to the NTC18 site class. The values of for each site class are given in Table 3. Note that the amplitude and shape of depend solely on the hazard parameters (a g and T C ) and ground category of the site (according to EC8 classification), which controls the definition of the horizontal seismic action. In Section 3.3, the background to the calibration of the parameters of the proposed model for design is provided. Fig. 1 - Proposed functional shape for the VH ratio for design. Table 1 Values of the parameter F v as a function of the site class. Site Class F v A (1000m/s) 1.30 B (560m/s) 1.40 C (270m/s) 1.60 D-E (150m/s) 1.75 Table 2 Values of the parameter VH min as a function of the site class. Site Class VH min A (1000m/s) 0.70 B (560m/s) 0.60 C (270m/s) 0.40 D-E (150m/s) 0.40