This study conducted a shaking table test using a centrifuge model to clarify the dynamic response of the saturated soil–reinforced concrete pile–superstructure interaction under conditions of multiple earthquakes. The shaking table test was conducted under a 50-G field with multiple shaking inputs reproducing the mainshock and aftershocks to explore the interactions in terms of differences in relative soil density. The centrifuge test demonstrated the liquefaction of saturated soil during the mainshock and the simultaneous formation of plastic hinges at the pile head and base. However, the gradual compaction of the ground by repeated shaking did not promote the occurrence of liquefaction. Ground compaction caused the shear span ratio of the pile member to decrease and the inertial force acting on the superstructure to increase. It is possible that in the case of low relative soil density, the maximum inertial force during aftershock excitation exceeded that of mainshock excitation.

这项研究使用离心模型进行了振动台试验，以阐明在多次地震条件下饱和土-钢筋混凝土桩-上部结构相互作用的动力响应。振动台测试是在50 G磁场下进行的，有多个振动输入可再现主震和余震，以探讨相对土壤密度差异的相互作用。离心测试表明，在主震过程中饱和土壤液化，同时在桩头和桩基处形成了塑料铰链。然而，通过反复摇动逐渐压实地面不会促进液化的发生。地面压实导致桩构件的剪切跨度比减小，作用在上部结构上的惯性力增大。