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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Evaluation of a passive gap damper to control displacements in a shaking test of a seismically isolated three-story frame
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Evaluation of a passive gap damper to control displacements in a shaking test of a seismically isolated three-story frame

机译：在隔震三层框架的振动测试中评估无源间隙阻尼器以控制位移

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Recent studies have indicated uncertainty about the performance limit states of seismically isolated buildings in very large earthquakes, especially if the isolator displacement demands exceed the seismic gap and induce pounding. Previous research has shown the benefit of providing phased supplemental damping that does not affect the isolation system response in a design event. A phased passive control device, or gap damper, was designed, fabricated, and experimentally evaluated during shake table testing of a quarter scale base-isolated three-story steel frame building. Identical input motions were applied to system configurations without a gap damper and with a gap damper, to directly assess the influence of the gap damper on displacement and acceleration demands. The gap damper was observed to reduce displacement demands by up to 15% relative to the isolated system without the gap damper. Superstructure floor accelerations increased substantially because of damper activation, but were limited to a peak of about 1.18g. The gap damper reduces displacement most effectively if the ground motion contains one or more of the following characteristics: the spectral displacement increases with increasing period near the effective period of the isolation system, the motion is dominated by a single large pulse rather than multiple cycles at a consistent intensity, and the motion has a dominant component aligned with a major axis of the structure. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：最近的研究表明，在非常大的地震中，地震隔离建筑物的性能极限状态尚不确定，尤其是在隔离器位移要求超过地震缝隙并引起撞击的情况下。先前的研究表明，提供分阶段的补充阻尼的好处是，它在设计事件中不会影响隔离系统的响应。在四分之一规模基础隔离的三层钢框架建筑的振动台测试期间，设计，制造了相控被动控制装置或间隙阻尼器，并进行了实验评估。将相同的输入运动应用于不带间隙阻尼器和带间隙阻尼器的系统配置，以直接评估间隙阻尼器对位移和加速度要求的影响。相对于没有间隙阻尼器的隔离系统，观察到间隙阻尼器可将位移需求降低多达15％。上层建筑的地面加速度由于阻尼器的激活而大大增加，但被限制在约1.18g的峰值。如果地面运动包含以下一个或多个特征，则间隙阻尼器可以最有效地减小位移：频谱位移随着隔离系统有效周期附近的周期增加而增加，该运动由单个大脉冲而不是在200Ω的多个周期控制强度一致，并且运动的主要成分与结构的主轴对齐。版权所有（c）2016 John Wiley＆Sons，Ltd.

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