Abstract
The structure-soil-structure interaction (SSSI) between high-rise buildings is numerically investigated. ANSYS has been further developed for calculation in the frequency domain, in which hysteretic damping can be considered for both the soil and structure. This study is presented in two subsequent papers. In the first part, i.e., this paper, the variations in the story shear force, interstory drift angle, displacement, velocity and acceleration of the superstructure, the sway of the foundation, and the axial and shearing forces of the pile are presented. The major influencing factors are the excitation frequency of a harmonic wave or the frequency components of a seismic wave, shaking direction of an exciting wave and direction of the structure arrangement. Under harmonic waves, the interaction mainly occurs when the excitation frequency is 1-5 Hz. Under seismic waves, when the shaking direction of an exciting wave is perpendicular to the direction of the structure arrangement and the direction of the structure arrangement is parallel to the lateral axis of the structure, the influence on the superstructure is greatest.
Highlights
The conventional seismic design or evaluation of structures considers local site effects; the effects of the soilstructure interaction (SSI) have recently been considered in design texts, i.e., only the concerned structure is taken into account[1]
( ) show the structure-soilstructure interaction (SSSI) effect, the influence of the SSSI is illustrated with the influence coefficient e, which is defined as rSSSI − rSSI / rSSI, where rSSI is the dynamic response, the steady-state response amplitude under a harmonic wave or the seismic response amplitude under a seismic wave, of a high-rise building of the single-structure-soil system and rSSSI is that of a high-rise building of the multistructure-soil system
For all seismic waves, when the shaking direction of the exciting wave is perpendicular to the direction of the structure arrangement and the direction of the structure arrangement is parallel to the lateral axis of the structure (CON.4), the influence of the SSSI on the dynamic response of the superstructure is the greatest
Summary
The conventional seismic design or evaluation of structures considers local site effects; the effects of the soilstructure interaction (SSI) have recently been considered in design texts, i.e., only the concerned structure is taken into account[1]. This study only provides a glimpse of the SSSI via a series of detailed finite element models on the dynamic structure-soil-structure interaction of piled high-rise buildings under earthquake excitations and provides some references for engineering designs. In the following paper[63], a parametric study is conducted to evaluate the influence of each key parameter, including the separation distance between two structures; the damping ratio, thickness and shear wave velocity of the soil; the length of the pile; the damping ratio, style, material stiffness, mass and story number of the superstructure; and the position and number of the structure, of a dynamic system on the SSSI effect. To explicitly ( ) show the SSSI effect, the influence of the SSSI is illustrated with the influence coefficient e , which is defined as rSSSI − rSSI / rSSI , where rSSI is the dynamic response, the steady-state response amplitude under a harmonic wave or the seismic response amplitude under a seismic wave, of a high-rise building of the single-structure-soil system and rSSSI is that of a high-rise building of the multistructure-soil system
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