GNGTS 2022 - Atti del 40° Convegno Nazionale

260 GNGTS 2022 Sessione 2.2 Since a major ductility request corresponds to an equivalent lower availability in terms of behaviour factor, an appropriate enlargement of the elastic response spectrum is proposed according to a conservative preliminary estimate of the scale factor η seq = 1.2 (Figure 3.a). This coefficient can be then applied in medium-high seismic zone (PGA≥0.2 g - Figure 3b), where these events are more frequent. The proposed value can be applied only for dissipative or not dissipative X-CBF one floor industrial systems. Funding. The research was financed by DPC-ReLUIS project 2019-2021 (WP12), Italy. References Amadio, C., Fragiacomo, M., Rajgelj, S., 2003. T he effects of repeated earthquake ground motions on the non-linear response of SDOF systems. Earthquake engineering & structural dynamics. 32, 291–308. Applied Technology Council, United States, Federal Emergency Management Agency, Building Seismic Safety Council (U.S.), 1997. 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