GNGTS 2014 - Atti del 33° Convegno Nazionale

results demonstrate that for the heterogeneous model the HEL solution provide results better than the HOL one. In particular, considering the HOL solution, the results show that in its lateral part the peak of the vertical component of the displacement (PGDv) induced by the seismic input in the most external part of the absorbing layer system (Point B in Fig. 3a) is equal to the 18.0% (Fig. 3b) of PGDv recorded in the inner part of the model (Point A in Fig. 3a). The PGDv in the most external part of the bottom portion of the absorbing system (Point D in Fig. 3a) is equal to 35.2% (Fig. 3b) of the peak recorded in the inner part of the model (Point E in Fig. 3a). These results lead to a preliminary finding: the absorbing layer system is more efficient in the later part of the model than in the bottom part. Analyzing the results obtained considering the HEL solution, it can be seen that the PGDv in F in the Fig. 3c (most external part of the heterogonous Fig. 3 – Efficiency analysis of the absorbing layer system in heterogeneous model: a) numerical model constructed for the numerical modeling considering HOL; b) results, in terms of displacement, from the numerical modeling made using homogenous HOL; c) numerical model constructed for the numerical modeling considering HEL; d) results, in terms of displacement, from the numerical modeling made using HEL. GNGTS 2014 S essione 2.2 299