Abstract A series of large-scale shaking table tests of tall buildings with nonlinear viscous dampers on soft soils in pile group foundations are performed to better understand the effect of the seismic pile-soil-structure interaction (PSSI) on the dynamic responses of the pile, soil, structure and the performance of the viscous dampers. Two different models are investigated, including a fixed-base structure with viscous dampers, representing the situation ignoring the soil-structure interaction (SSI) and a structure with viscous dampers supported by 3-by-3 pile group foundation in soft soil within a shear laminar soil container. The superstructure is a 12-story reinforced concrete (RC) frame. The seismic excitations of Shanghai Bedrock waves, 1995 Kobe earthquake and 1999 Chi-Chi earthquake events are selected and used in the shaking table tests. Finally, a three-dimensional numerical model is developed and verified to be appropriate for capturing the dynamic responses of soil-pile-structure with viscous dampers. Based on the experimental results, the PSSI system has longer natural periods and the frequencies decrease more lightly than the fixed-base structure after the tests. In addition, the influences of PSSI on the frequencies are much greater than the damping ratio. Moreover, by comparing with the fixed-base conditions, PSSI tends to decrease elastic-plastic inter-story drift of the structure more greatly than the acceleration and shear force. However, the overall deformation of the structure may increase due to the obvious and large rocking and translational components. More interestingly, the hysteretic performance and the efficiency of viscous dampers on mitigating the structural dynamic responses are reduced by the PSSI effect compared with the fixed-base models. Consequently, ignoring the SSI effects may result in unrealistic results of the seismic responses of the superstructure and overstate the performance of the nonlinear viscous dampers. It is of great importance to consider the seismic SSI effect in the design of viscous dampers and structures.

中文翻译：

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考虑桩-土-结构相互作用的含粘性阻尼器高层建筑大型振动台试验

摘要 为了更好地理解桩-土-结构相互作用（PSSI）对桩动力响应的影响，对桩组地基软土上具有非线性粘性阻尼器的高层建筑进行了一系列大型振动台试验。 、土壤、结构和粘性阻尼器的性能。研究了两种不同的模型，包括带有粘性阻尼器的固定基础结构，代表忽略土-结构相互作用 (SSI) 的情况和带有粘性阻尼器的结构，由 3×3 桩组基础在剪切软土中支撑层流土壤容器。上部结构是一个 12 层的钢筋混凝土 (RC) 框架。振动台试验选用上海基岩波、1995年神户地震和1999年集集地震的地震激发。最后，开发并验证了一个三维数值模型，适用于捕捉带有粘性阻尼器的土桩结构的动力响应。实验结果表明，经测试，PSSI系统比固定基座结构具有更长的固有周期，频率下降幅度更小。此外，PSSI 对频率的影响远大于阻尼比。此外，通过与固定基础条件相比，PSSI倾向于比加速度和剪切力更大地降低结构的弹塑性层间漂移。然而，由于明显且较大的摇摆和平移分量，结构的整体变形可能会增加。更有趣的是，与固定基础模型相比，PSSI 效应降低了粘性阻尼器在减轻结构动力响应方面的滞后性能和效率。因此，忽略 SSI 效应可能会导致上部结构的地震响应结果不切实际，并夸大非线性粘性阻尼器的性能。在粘性阻尼器和结构的设计中考虑地震 SSI 效应非常重要。