GNGTS 2013 - Atti del 32° Convegno Nazionale

models are employed, namely flag-shape behaviour with different energy dissipation, and slip- type behaviour. The former hysteretic model is typical of masonry slender structures (Amadio et al. , 2011), whilst the latter one represents in general all the wooden structures with metal fasteners (Rinaldin et al. , 2013). The aim is to evaluate whether the aforementioned methods proposed by current seismic design codes are accurate also for these hysteretic models and different dissipative capacity of the structure. Inelastic spectra. To calculate the inelastic spectra, 15 Italian recorded earthquake ground motions have been considered. They are consistent with the Eurocode 8 (EC8) spectrum with their average value. The adopted EC8 elastic spectrum has been calculated for a ground with the characteristics presented in Tab. 1, while the complete list of employed seismic records is reported in Tab. 2. Tab. 1 – Characteristics of elastic spectrum according to EC8. Ground type S β 0 k 1 k 2 T B [s] T C [s] T D [s] A 1.0 2.5 1.0 2.0 0.15 0.40 2.0 Tab. 2 – Seismic record description. Code Record Date Component a g S d,max S a,max [g] [cm] [g] 01 0032 Codroipo 06/05/76 N-S 0.066 8.3 0.217 02 0038 Tolmezzo 06/05/76 N-S 0.366 7.5 1.060 03 0143 Buia 11/09/76 E-W 0.110 3.5 0.271 04 0143 Buia 11/09/76 N-S 0.234 7.3 0.639 05 0152 Forgaria C. 15/09/76 E-W 0.218 7.0 0.858 06 0153 S. Rocco 15/09/76 E-W 0.135 7.7 0.513 07 0156 Buia 15/09/76 E-W 0.094 5.1 0.287 08 0156 Buia 15/09/76 N-S 0.109 9.4 0.327 09 0168 Forgaria C. 15/09/76 N-S 0.352 7.8 1.058 10 0169 S. Rocco 15/09/76 E-W 0.251 9.9 0.679 11 0169 S. Rocco 15/09/76 N-S 0.131 7.3 0.315 12 0301 Patti 15/04/78 N-S 0.071 2.6 0.271 13 0302 Naso 15/04/78 E-W 0.132 2.1 0.503 14 0350 Cascia 19/09/79 E-W 0.210 7.0 0.596 15 0636 Calitri 23/11/80 E-W 0.175 18.6 0.595 Hysteretic models. Three hysteresis models were used: the former one presents a fully dissipative cycle (Fig. 1a), the second one is a flag-shape model (Fig. 1a) and the latter one represents slip-type systems (Fig. 1b). The flag-shape model was studied with three cycle amplitudes, characterised by three different C F coefficients (Fig. 1a), as reported in Eq. (4). (4) 132 GNGTS 2013 S essione 2.1