Three-dimensional dynamic characteristics of structure-wall foundation-soil systems are investigated by considering arrangement effects of wall foundations. A hybrid approach combined with a finite element method and a boundary element method is employed for numerical analyses in the frequency domain. It becomes clear that arrangements of wall foundations does not much affect the structural response while the stresses of wall foundations and the nonlinearity of the soil inside the wall foundations vary with the arrangements. In .addition, a lattice type wall foundation can reduce effectively the nonlinearity of the soil inside the wall foundations against incident waves coming from every direction.
