Dynamic Analysis   
The dynamic analysis is performed, after  the final step of the construction stage described before, by using Nonlinear  Time History analysis, considering the seismic inputs described in previous  paragraph. The present analysis is repeated for all the two above described characteristic sections  (Figures 17 and 18).
In order to minimize reflection effects on  vertical lateral boundaries of the grid, as mentioned before, free field  boundary conditions available in MIDAS GTS library have been used.
The soil  hysteretic behaviour was modeled using the shear modulus decay curves  given by [9] and [11] (Figure 16). In order to evaluate the seismic response  of the system (Figure 19), the amplification of the seismic input was evaluated  at the remarkable points A, B, C and D represented in Figures 17 and 18.