新型旋转放大式黏弹性阻尼器性能试验研究

该文提出了一种新型旋转放大式黏弹性阻尼器，该阻尼器利用杠杆原理将梁柱节点处相对较小的转角变形成倍放大。通过放大转角变形，充分发挥阻尼器的耗能能力，可实现更理想的减震控制效果。介绍了阻尼器的基本构造及工作原理，并加工制作了实物模型；进而对其进行频率相关性、变形相关性以及疲劳性能加载试验，探究其最大阻尼力、等效剪切刚度、每循环耗能和等效粘滞阻尼比等力学性能指标的变化规律；并与传统无放大功能转角阻尼器的力学性能进行了对比，验证了所提阻尼器的耗能放大能力。试验结果表明:该阻尼器滞回曲线饱满，滞回性能稳定，抗疲劳性能良好；与传统转角无放大功能阻尼器相比，其耗能能力最大可提高4.42倍。

EXPERIMENTAL STUDY ON THE PROPERTIES OF A NEW ROTATIONMAGNIFIED VISCOELASTIC DAMPER

This paper develops a new rotation-magnified viscoelastic damper,and the leverage principle is used to magnify the relatively small rotation angle at the beam-column joint of a structure.By magnifying the rotation angle,the energy dissipation capacity of the damper is fully utilized to achieve a more ideal vibration control effect.First,the basic structure and working principle of the damper are introduced,and a physical model is manufactured.Then the frequency dependency,deformation dependency and fatigue performance loading tests of the damper have been performed to investigate the change law of its mechanical performance indexes,such as the maximum damping force,equivalent shear stiffness,energy consumption per cycle and equivalent viscous damping ratio.Finally,the mechanical properties of the traditional angle damper without amplification function are tested to validate the energy consumption amplification ability of the proposed damper.Results show that:the hysteresis curve of the damper is plump with stable hysteresis performance,and the anti-fatigue performance is good;compared with traditional angle damper without amplification function,its energy consumption capacity can be increased by up to 4.42 times.