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Damping identification of a full-scale passively controlled five-story steel building structure

机译：大型被动控制五层钢结构建筑的阻尼识别

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A series of large-scale dynamic tests was conducted on a passively controlled five-story steel building on the E-Defense shaking table facility in Japan to accumulate knowledge of realistic seismic behavior of passively controlled structures. The specimen was tested by repeatedly inserting and replacing each of four damper types, that is, the buckling restrained braces, viscous dampers, oil dampers, and viscoelastic dampers. Finally, the bare steel moment frame was tested after removing all dampers. A variety of excitations was applied to the specimen, including white noise, various levels of seismic motion, and shaker excitation. System identification was implemented to extract dynamic properties of the specimen from the recorded floor acceleration data. Damping characteristics of the specimen were identified. In addition, simplified estimations of the supplemental damping ratios provided by added dampers were presented to provide insight into understanding the damping characteristics of the specimen. It is shown that damping ratios for the specimen equipped with velocity-dependent dampers decreased obviously with the increasing order of modes, exhibiting frequency dependency. Damping ratios for the specimen equipped with oil and viscoelastic dampers remained constant regardless of vibration amplitudes, whereas those for the specimen equipped with viscous dampers increased obviously with an increase in vibration amplitudes because of the viscosity nonlinearity of the dampers. In very small-amplitude vibrations, viscous and oil dampers provided much lower supplemental damping than the standard, whereas viscoelastic dampers could be very efficient.
机译：在日本E-Defense振动台设施上的一栋被动控制的五层钢结构建筑上进行了一系列大规模动态测试，以积累有关被动控制结构的真实地震行为的知识。通过反复插入和更换四种减振器类型中的每一种来测试样品，这些减振器是屈曲约束支撑，粘性阻尼器，油阻尼器和粘弹性阻尼器。最后，在卸下所有阻尼器之后，对裸钢力矩框架进行了测试。各种激励作用于标本，包括白噪声，各种水平的地震运动和振动激励。进行系统识别以从记录的地板加速度数据中提取样品的动态特性。确定了样品的阻尼特性。此外，还介绍了由增加的阻尼器提供的补充阻尼比的简化估计，以帮助您理解试样的阻尼特性。结果表明，装有速度相关阻尼器的试样的阻尼比随模数的增加而明显降低，表现出频率依赖性。装备有油和粘弹性阻尼器的试样的阻尼比保持恒定，而与振动幅度无关，而装备有粘性阻尼器的试样的阻尼比却明显增加，这是由于阻尼器的粘度非线性所致。在非常小的振幅振动中，粘性阻尼器和油阻尼器提供的补充阻尼比标准阻尼器低得多，而粘弹性阻尼器可能非常有效。

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