持续变刚度摩擦型阻尼器

A friction damper with continuously variable post-sliding stiffness

文中提出了一种具有持续可变滑移后刚度的摩擦型阻尼器。与传统摩擦阻尼器相比,这种阻尼器的滑移后刚度随变形增加而持续增长,承载能力显著提高。使用者可以根据不同地震水平下的性能目标调整输出力的大小,因此也为不同目标值下的结构控制提供了一种切实可行的方法。阻尼器采用套筒-活塞式结构,摩擦片通过橡胶层固化到活塞上,橡胶层同时为摩擦片提供面压。摩擦片与套筒内壁形成滑移面,该滑移面的内径沿轴向呈曲线变化,理论分析、数值模拟与试验结果表明,抛物线形的滑移面可提供呈三次函数关系的力与位移关系曲线,持续增长的刚度和出力,有利于改善结构的抗倒塌性能。

A type of friction damper characterized a continuously variable post-sliding stiffness is proposed,which provides an increasing post-sliding force with the accretion of the deformation.It is possible to adjust the output force according to the performance targets at different earthquake levels,thus enlightening a practical approach to the explicit structural control to satisfy all of the required performance objectives.The proposed damper consists of a piston,a rubber layer,friction plates and the jacket.The friction plates and the inside of the jacket constitute the contact pair,or the sliding surface.The friction plates are fixed on the piston through the rubber layer which provides the normal pressure on the sliding surface.The radius of sliding surface varies continuously along the axis of the jacket.Both analyses and experiments reveal that the parabola shape of sliding surface would introduce a cubic force-displacement relationship,which is helpful to prevent a structure from collapse.