Soil–pile–structure interaction under SH wave excitation

Abstract

SUMMARYA continuum model for the interaction analysis of a fully coupled soil-pile-structure system under seismic excitation is presented in this paper. Only horizontal shaking induced by harmonic SH waves is considered so that the soil-pile-structure system is under anti-plane deformation. The soil mass, pile and superstructure were all considered as elastic with hysteretic damping, while geometrically both pile and structures were simpliÿed as a beam model. Buildings of various heights in Hong Kong designed to resist wind load were analysed using the present model. It was discovered that the acceleration of the piled-structures at ground level can, in general, be larger than that of a free-ÿeld shaking of the soil site, depending on the excitation frequency. For typical piled-structures in Hong Kong, the ampliÿcation factor of shaking at the ground level does not show simple trends with the number of storeys of the superstructure, the thickness and the sti ness of soil, and the sti ness of the superstructure if number of storeys is ÿxed. The e ect of pile sti ness on the ampliÿcation factor of shaking is, however, insigniÿcant. Thus, simply increasing the pile size or the superstructure sti ness does not necessarily improve the seismic resistance of the soil-pile-structure system; on the contrary, it may lead to excessive ampliÿcation of shaking for the whole system.

Dynamic structure–soil–structure interaction between nearby piled buildings under seismic excitation by BEM–FEM model

“…Dynamic impedances and seismic response of piles and pile groups have been presented for several configurations and load conditions. These results can be used to address soil-structure interaction problems of pile supported structures making use of substructuring approaches as, for instance, in [40,41,42], though direct formulations have also been proposed and implemented, for example, for the dynamic analysis of bridge-pier systems, long-span bridges and multi-storey structures supported on piles, taking SSI into account [43,44,45]. A review of applications of the boundary element method (BEM) to the solution of both pile foundations and SSI elastodynamic problems, proposed during the period 1986-1996, was presented by Beskos [46].…”

Dynamic analysis of piled foundations in stratified soils by a BEM–FEM model

“…However, not many papers have been reported focusing on this topic [18,19], though some have dealt with it while studying the pile-soil-structure interaction problem [20,21,22,23].…”

A numerical model for the dynamic analysis of inclined pile groups

“… have proposed a numerical model by adopting a BEM‐FEM coupled formulation for the evaluation of the dynamic stiffness and kinematic response of pile groups with floating or end‐bearing inclined piles. These models also allow adopting the substructure approach to perform complete soil–structure interaction analysis evaluating effects of the soil–foundation compliance and dissipation properties on the seismic response of the superstructure, as widely investigated for vertical piles .…”

“…To this purpose, Gerolymos et al [12] and Giannakou et al [13] have recently published results of numerical investigations based on finite element discretization of the soil-pile group system, while Padrón et al [16,17] and Medina et al [18] have proposed a numerical model by adopting a BEM-FEM coupled formulation for the evaluation of the dynamic stiffness and kinematic response of pile groups with floating or end-bearing inclined piles. These models also allow adopting the substructure approach [19] to perform complete soil-structure interaction analysis evaluating effects of the soil-foundation compliance and dissipation properties on the seismic response of the superstructure, as widely investigated for vertical piles [20][21][22][23][24][25][26].…”