Seismic soil-pile foundation-structure interaction (SSPSI) especially in soft clay or liquefaction susceptible ground was reported as a key factor in seismic design by many investigators. Present study attempts to examine the influence of SSPSI on design response of pile foundation supported building structure embedded in soft clay through scaled model experiments using shake table. Study considers parametric variation of model superstructure and pile foundation in soft homogenous kaolin bed for developing an insight into seismic behavior of spectrum of structural systems under swept sine motions. Dynamic characteristics and acceleration response of model soil-pile foundation-structural systems are recorded in time and frequency domain in order to study the influence of SSPSI. Results indicate that shorter period superstructure system supported on pile foundation with relatively lesser lateral stiffness exhibits significant lengthening of period as compared to counterpart structure supported by higher foundation stiffness. Acceleration recorded at superstructure is found to be increased for shorter (0.3–0.4secs) period structures due to SSPSI effect compared to fixed base condition irrespective of pile groups. Whereas, the acceleration recorded at pile head supporting short period structure exhibits subdued response compared to fixed base consideration. On the other hand, pile head acceleration is observed to be higher for moderate range (0.5–0.7 secs) of building structures for applied steady state motion which may be due to involvement of increased inertial forces.

许多研究人员报告说，特别是在软粘土或易液化的地基中，地​​震土桩基础-结构相互作用（SSPSI）是地震设计中的关键因素。本研究试图通过使用振动台的比例模型试验来检验SSPSI对埋入软粘土中的桩基础支撑建筑结构设计响应的影响。研究考虑了软均质高岭土床中模型上部结构和桩基的参数变化，以深入了解扫掠正弦运动下结构系统频谱的地震行为。在时域和频域中记录了模型桩基础结构系统的动力特性和加速度响应，以研究SSPSI的影响。结果表明，与较高刚度支撑的对应结构相比，短周期上部结构支撑在桩基础上的侧向刚度相对较小，并且周期显着延长。与固定基础条件相比，由于SSPSI效应，在较短的结构中（0.3-0.4秒），在上部结构处记录的加速度被发现增加，而与桩组无关。然而，与固定基础相比，桩头支撑短周期结构记录的加速度表现出柔和的响应。另一方面，观察到在施加稳态运动的建筑结构的适度范围内（0.5-0.7秒），桩头加速度较高，这可能是由于惯性力增加所致。