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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Shake table tests on a mass eccentric model with base isolation
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Shake table tests on a mass eccentric model with base isolation

机译：具有基础隔离的质量偏心模型的振动台测试

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A mass eccentric structure is usually more seismically vulnerable than its concentric counterpart because of the coupled torsional-translational response of such structures. In this work, dynamic characteristics and response of a five-storey benchmark model with moderate mass eccentricity were investigated using a shake table, simulating four different ground motions. The effectiveness of laminated rubber bearings (LRB) and lead-core rubber bearings (LCRB) in protecting eccentric structures was examined and evaluated in relation to translational and torsional responses of the benchmark model. It was observed that both translational and torsional responses were significantly reduced with the addition of either a LRB or LCRB isolated system regardless of the nature of ground motion input. The LRB were identified to be more effective than LCRB in reducing model relative displacements, the relative torsional angle as well as accelerations, and therefore provided a better protection of the superstructure and its contents. On the other hand, LCRB rendered a smaller torsional angle and absolute displacement of the base isolation system, hence a more stable structural system.
机译：大质量偏心结构通常比同心结构更易受地震的影响，因为这种结构会产生扭转和平移响应。在这项工作中，使用振动台模拟了四个不同的地面运动，研究了具有中等质量偏心率的五层基准模型的动力特性和响应。相对于基准模型的平移和扭转响应，检查并评估了层压橡胶轴承（LRB）和铅芯橡胶轴承（LCRB）在保护偏心结构方面的有效性。观察到，无论地面运动输入的性质如何，通过添加LRB或LCRB隔离系统，平移和扭转响应都会显着降低。经证实，LRB在降低模型相对位移，相对扭转角以及加速度方面比LCRB更有效，因此可以更好地保护上部结构及其内容。另一方面，LCRB使基础隔振系统的扭转角和绝对位移较小，因此结构系统更稳定。

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