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

Abstract

The dynamic through-soil interaction between nearby pile supported structures in a viscoelastic half-space, under incident S and Rayleigh waves, is numerically studied. To this end, a three-dimensional viscoelastic BEM-FEM formulation for the dynamic analysis of piles and pile groups in the frequency domain is used, where soil is modelled by BEM and piles are simulated by one-dimensional finite elements as Bernoulli beams. This formulation has been enhanced to include the presence of linear superstructures founded on pile groups, so that structure-soilstructure interaction (SSSI) can be investigated making use of a direct methodology with an affordable number of degrees of freedom. The influence of SSSI on lateral spectral deformation, vertical and rotational response, and shear forces at pile heads, for several configurations of shear one-storey buildings, is addressed. Maximum response spectra are also presented. SSSI effects on groups of structures with similar dynamic characteristics have been found to be important. The system response can be either amplified or attenuated according to the distance between adjacent buildings, which has been related to dynamic properties of the overall system.

Vibration control of piled-structures through structure-soil-structure-interaction

“…A similar behaviour has been observed in the past see e.g. Luco and Contesse [3], Kobori and Kusakabe [4], and more recently by Alexander et al [12] in the case of the study of cross dynamic interaction of structures founded on surface foundations and by Padròn et al [25] in the case of nearby pile supported structures as well as in the laboratory and field tests on models of nuclear power plant buildings conducted by the Nuclear Power Electric Corporation (NUPEC) for investigating the dynamic cross interaction effects [26][27]. Figure 8 illustrates the stochastic response of the internal unit of the ViBa under the same input and soil profiles used for Figure 7.…”

Structure-soil-structure interaction effects on the dynamic response of piled structures under obliquely incident seismic shear waves

“…Such a model was used in [20] to study the SSSI effects in piled structures under vertical seismic excitation and was also used in [22] to study the effect of the incidence angle and type of wave in the dynamic response of pile groups and a single piled structure. The analysis of the SSSI effects is made in frequency-domain through the study of the shear forces at the base of the structure.…”

“…5 as the variations in the maximum shear force are different from zero, which means that the maximum responses of the buildings in the group differ from the maximum response of the single building system. Note also that, even for vertical incidence (θ 0 = 90 o ), the responses of the lateral buildings and the central structure do not coincide due to SSSI [20].…”

“…On the other hand, the constants defining the properties of the soil-structure system are listed in Table 2, where c s is the soil shear wave velocity. These values were chosen in order to be representative for typical constructions and have been used in previous studies [17][18][19][20]. In order to see the dynamic behaviour of the selected soil-structure system, Fig.…”

Kinematic internal forces in deep foundations with inclined piles

“…This soil -pile interaction model was first presented in Padrón et al [11], work where the model was validated for the computation of dynamic stiffness and damping functions for vertical piles. After applying the model to several other related problems [12,13,14], the formulation was generalized to inclined piles in Padrón et al [15] and validated for and applied to the computation of impedance functions for raked piles. The problem of impedance functions of end-bearing inclined piles was later treated in Padrón et al [16].…”