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Manual utilizator Slope - GeoStru Software

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37<br />

<strong>Slope</strong><br />

si raccomanda di adottare lo spettro di Tipo 2. Per i cinque tipi di terreno A, B, C, D ed E i<br />

valori raccomandati dei parametri S, T B<br />

, T C<br />

e T D<br />

sono dati nel prospetto 3.2 per lo spettro<br />

di Tipo 1 e nel prospetto 3.3 per lo spettro di Tipo 2. La figura 3.2 e la figura 3.3 mostrano<br />

le forme degli spettri raccomandati di Tipo 1 e Tipo 2, rispettivamente, normalizzati<br />

rispetto ad a g<br />

, per uno smorzamento del 5%. Spettri differenti possono essere definiti<br />

nell’appendice nazionale, se si tiene in conto della geologia profonda.<br />

Note 1: The values to be ascribed to T B<br />

, T C<br />

, T D<br />

and S for each ground type and type<br />

(shape) of spectrum to be used in a country may be found in its National Annex. If deep<br />

geology is not accounted for (see 3.1.2(1) ), the recommended choice is the use of two<br />

types of spectra: Type 1 and Type 2. If the earthquakes that contribute most to the<br />

seismic hazard defined for the site for the purpose of probabilistic hazard assessment<br />

have a surface-wave magnitude, M s , not greater than 5,5, it is recommended that the<br />

Type 2 spectrum is adopted. For the five ground types A, B, C, D and E the recommended<br />

values of the parameters S, T B<br />

, T C<br />

and T D<br />

are given in Table 3.2 for the Type 1<br />

Spectrum and in Table 3.3 for the Type 2 Spectrum. Figure 3.2 and Figure 3.3 show<br />

the shapes of the recommended Type 1 and Type 2 spectra, respectively, normalized by a<br />

g, for 5% damping. Different spectra may be defined in the National Annex, if deep<br />

geology is accounted for.<br />

Ground type S T B<br />

(s) T C<br />

(s) T D<br />

(s)<br />

A 1,0 0,15 0,4 2,0<br />

B 1,2 0,15 0,5 2,0<br />

C 1,15 0,20 0,6 2,0<br />

D 1,35 0,20 0,8 2,0<br />

E 1,4 0,15 0,15 2,0<br />

Table 3.2 - V alue s of t he param e t e rs de sc ribing t he re c om m e nde d T y pe 1 e last ic<br />

re sponse spe c t ra<br />

Ground type S T B<br />

(s) T C<br />

(s) T D<br />

(s)<br />

A 1,0 0,05 0,25 1,2<br />

B 1,35 0,05 0,25 1,2<br />

C 1,5 0,10 0,25 1,2<br />

D 1,8 0,10 0,30 1,2<br />

E 1,6 0,05 0,25 1,2<br />

Table 3.3 - V alue s of t he param e t e rs de sc ribing t he re c om m e nde d T y pe 2 e last ic<br />

re sponse spe c t ra<br />

© <strong>GeoStru</strong> <strong>Software</strong>-<strong>Slope</strong> 8.0.1

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