Piles-induced filtering effect on the Foundation Input Motion

Quasi-Kinematic Response of Embedded Foundations: Evidence of Foundation Mass Effect From Numerical Analyses and Instrumented Structures

“…: the embedded foundation is rigid (G F /G S ≫1) and the soil deposit is assimilated to a homogeneous half-space (H d /H≫1). With reference to ξ and ν S , numerical investigations have shown that, while these parameters affect the dynamic response of both the foundation and the soil, they have a minor influence on the kinematic response factors [6,17]. Moreover, Conti et al [12] have shown that only the foundation width B in the polarization plane of the shear wave affects the filtering phenomenon, denoting that the aspect ratio (L/H) of the foundation may be disregarded.…”

“…By focusing on the filtering action of the foundation, kinematic interaction has been recognized to play a significant role in the case of both embedded [5] and deep foundations [6], where the foundation input motion (FIM) may differ substantially from the free-field motion at ground surface. Further studies, taking into account both the soil-foundation system and the superstructure, have shown that the filtering effect is usually beneficial for squat structures while it may be detrimental for slender buildings with deeply embedded foundations or basements [7] by increasing the ductility demand.…”

Piles-Induced Filtering Action and Its Effect on the Seismic Response of Buildings

“…Transient response is investigated by using real signals, selected from an Italian database [23] and the European database by Ambraseyes et al [24]. Time histories and Fourier spectra of the above events are reported in Di Laora and de Sanctis [25]. Some results of the parametric analysis are illustrated in Fig.…”

“…For further details about Eqs (9, 10) the reader can refer to Di Laora & de Sanctis [25]. All the ingredients are now available to define reduced design spectra.…”

Kinematic and inertial forces in pile foundations under seismic loading

“…the spectral acceleration may change considerably with change in natural period and damping) [14][15][16][17].…”