ABSTRACT

Sliding implant-magnetic bearing (IMB) is a new type of seismic isolators that benefits from its adaptive energy-dissipation behavior. In order to assess the performance of the sliding IMB for seismic protection, a complete shaking table test on the base-isolated structure is reported in the present paper. Tri-directional-recorded earthquake ground motions and mono-directional artificial earthquake ground motions pertaining to both site classes II and III are employed to drive structural vibration in the laboratory experiment, respectively. Seismic mitigation of the base-isolated structure with respect to dynamic characteristics, story accelerations, inter-story drifts, horizontal torsions, and local strains is addressed. Experimental study shows expected results that the base-isolated structure with sliding IMBs attains more profitable mitigations on story accelerations and inter-story drifts under earthquake ground motions pertaining to the stiff soil site than those pertaining to the soft soil site. Significant mitigations on horizontal torsion of the structure and on local strain at the column bottom are attained as well. In addition, seismic performance of sliding IMBs during the shaking table test is assessed. It is revealed that the isolators exhibit satisfactory energy-dissipation capacity and excellent frictional behavior, and maintain good working state during the entire experimental test.

摘要

滑动植入磁轴承（IMB）是一种新型的隔震器，得益于其自适应的能量耗散行为。为了评估滑动IMB的抗震性能，本文报道了对基础隔震结构的完整振动台试验。在实验室实验中，分别采用与场地等级 II 和 III 相关的三向记录地震地震动和单向人工地震动来驱动结构振动。解决了与动力特性、层加速度、层间漂移、水平扭转和局部应变有关的基础隔震结构的地震缓解问题。实验研究表明，具有滑动 IMB 的基础隔震结构在与软土场地相关的地震地面运动下，在楼层加速度和层间漂移方面获得了更有利的缓解效果。结构的水平扭转和柱底的局部应变也得到了显着缓解。此外，还评估了振动台试验期间滑动 IMB 的抗震性能。结果表明，隔振器具有良好的消能能力和优异的摩擦性能，在整个实验测试过程中保持良好的工作状态。结构的水平扭转和柱底的局部应变也得到了显着缓解。此外，还评估了振动台试验期间滑动 IMB 的抗震性能。结果表明，隔振器具有良好的消能能力和优异的摩擦性能，在整个实验测试过程中保持良好的工作状态。结构的水平扭转和柱底的局部应变也得到了显着缓解。此外，还评估了振动台试验期间滑动 IMB 的抗震性能。结果表明，隔振器具有良好的消能能力和优异的摩擦性能，在整个实验测试过程中保持良好的工作状态。