This research is to assess the influences of the inertial mass from the girder on the dynamic characteristic, dynamic response, and structure-soil interaction of a pile-soil-pier subsystem in a scale-model of a cable-stayed bridge. Therefore, both connection configurations between the pile-soil-pier and girder, including the sliding and fixed connections, were designed to present various inertial mass from the superstructure delivered to the pile-soil-pier. The pile-soil-pier supported by a 3 × 3 pile-group in mixed soil placed in a shear box was tested using shaking tables. The dynamic characteristics, seismic responses, inertial interactions, and pile group effects of the pile-soil-pier between the sliding and fixed connections were analyzed under three input motions with different shaking amplitudes. These results showed that more inertial mass from the girder significantly increased the reinforcement strain and bending moment at the column bottom and pile top, displacement at the column top, inertial interaction effects, and pile group effects of the pile-soil-pier due to the sliding connection changing to the fixed connection. The inertial mass increment from the girder noticeably decreased the peak accelerations of the column of the pile-soil-pier when subjected to three input motions with different amplitudes. However, the inertial mass insignificantly affected the accelerations of the pile and free-soil. Therefore, the corresponding kinematic interaction effects were almost unaffected by the inertial mass. Additionally, the evident pile group effects were observed in the sliding and fixed connections between the pile-soil-pier and girder. The numerical model could approximately reproduce the macroscopic seismic responses of the pile-soil-piers with sliding and fixed connections and capture the typical response variations induced by the connection configuration change.

这项研究旨在评估斜拉桥的比例模型中，梁的惯性质量对桩-土-桩子系统的动力特性，动力响应和结构-土相互作用的影响。因此，桩-土-桩与梁之间的两种连接结构，包括滑动连接和固定连接，都被设计为呈现出从上部结构传递到桩-土-桩的各种惯性质量。使用振动台测试了由3×3桩组支撑的放置在剪切箱中的混合土壤中的桩土桩。在三种振动幅度不同的输入运动下，分析了滑动连接和固定连接之间桩-土-桩的动力特性，地震响应，惯性相互作用和桩群效应。这些结果表明，来自大梁的更多惯性质量显着增加了柱底和桩顶的钢筋应变和弯矩，柱顶的位移，惯性相互作用效应以及桩-土-桩的桩群效应。滑动连接更改为固定连接。当进行三个不同幅度的输入运动时，大梁的惯性质量增量显着降低了桩土桩柱的峰值加速度。但是，惯性质量对桩和自由土的加速度影响不大。因此，相应的运动学相互作用效应几乎不受惯性质量的影响。此外，在桩-土-桩与梁之间的滑动和固定连接中观察到明显的桩群效应。