ABSTRACT
A reliable analysis should account for the main features previously described by carrying out a complete soil-structure interaction study.
The first step consists in performing a local site response analysis of the soil profile (for usual purposes a one-dimensional analysis is sufficient) by deconvoluting the accelerograms defined at the bedrock outcropping and studying the polarized shear wave propagation (Bardet J.P. et al. 2000). This permits to evaluate the effects of the free-field motion variable with depth. The second step consists in the structural analysis including the soil-foundation system. The problem is governed, in the frequency domain, by a system of complex linear equations
f
f
d
d
d
KK0
0KK
(1)
where the partition descends from the separation of the displacements in the structure (dS), foundation (dF ) and embedded piles (dE) components (Dezi et al, 2007). Foundation impedances have to account for pile-soil-pile interaction and radiation damping and should be able to describe also the foundation rocking response. The known term collects the forces descending from the local site response analysis previously carried out.
