Three-dimensional isolation system (3DIS) has been increasingly applied to civil structures with small height-width ratios, but is rarely employed in the multistory and high-rise buildings due to the lack of efficient control strategy for the rocking effect. In this paper, a simplified analysis model of 3DIS was established firstly to bring insights into the coupled motion mode caused by the rocking effect, and the influence of damping ratio and height-width ratio on the modal frequency was revealed. Then, aimed at weakening rocking motion and improving the seismic isolation efficiency, a novel multi-dimensional earthquake isolation and mitigation device (MEIMD) was proposed, and both the design composition and design principle were given in detail. To validate the effectiveness of MEIMDs, a full-scale four-story frame with a height of 13.05 m and a weight of 70 tons was produced for horizontal shaking table tests. The experimental results indicated that after adopting MEIMDs, the first-order modal frequency was 1.7 Hz, with 68% decrease compared with that of the prototype structure, and the first-order modal damping ratio was above 0.23, about eight times that of the prototype structure. Moreover, the horizontal peak acceleration was significantly decreased for each floor with a maximum reduction of 49%, while the maximum horizontal displacement and rocking response were obviously lower than the limit value specified by building codes. Therefore, the MEIMDs can not only efficiently isolate the earthquake energy, but also ensure the sufficient dynamic stability of the system. This study sheds light on the real coupled horizontal-rocking response of the base isolation system with MEIMDs, and can promote the development and application of 3DIS in multistory and high-rise buildings.

中文翻译：

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使用多维隔震减震装置对四层原型结构进行水平振动台试验


三维隔震系统（3DIS）越来越多地应用于高宽比较小的土木结构中，但由于缺乏有效的摇摆效应控制策略，在多层和高层建筑中的应用很少。本文首先建立了3DIS的简化分析模型，以深入了解摇摆效应引起的耦合运动模态，并揭示阻尼比和高宽比对模态频率的影响。然后，以减弱摇摆运动、提高隔震效率为目标，提出了一种新型多维隔震减震装置（MEIMD），并详细给出了设计组成和设计原理。为了验证MEIMD的有效性，制作了一个高13.05 m、重70吨的全尺寸四层框架用于水平振动台测试。实验结果表明，采用MEIMD后，一阶模态频率为1.7 Hz，与原型结构相比降低了68%，一阶模态阻尼比在0.23以上，约为原型结构的8倍结构。此外，每层的水平峰值加速度均显着降低，最大降低了49%，而最大水平位移和摇摆响应明显低于建筑规范规定的限值。因此，MEIMD不仅可以有效隔离地震能量，而且可以保证系统足够的动力稳定性。 该研究揭示了MEIMD基础隔震系统的真实耦合水平摇摆响应，可促进3DIS在多层和高层建筑中的发展和应用。