一种新型半主动摩擦阻尼器的耗能性能研究

A New Type of Semi-Active Friction Damper

文章针对被动摩擦阻尼器滞回曲线不饱满,对结构响应控制效果有待于进一步提高的特点提出了一种具有简单控制律的Off-On半主动摩擦阻尼器。阐明其工作机理,建立了半主动摩擦耗能减震结构的动力方程,通过时程分析计算讨论了一安装半主动摩擦阻尼器的结构在地震作用下的响应控制效果,并与无控结构和被动控制结构进行了对比分析。结果表明,本文所提出的Off-On半主动摩擦阻尼器能够大大减小地震作用对结构的破坏,在有效减小结构位移响应的同时,对层间剪力的控制效果也非常显著,滞回曲线非常饱满,耗能性能优良,对结构的控制效果优于传统的被动摩擦阻尼器。

Aim. Different from past semi-active friction dampers , ours uses simple control law and is easy to implement; as to the relatively full hysteresis loop, it is as good as the best of past semi-active friction dampers. Section 1 of the full paper explains the calculation model of our semi-active friction damper and its control, which is described with the help of Fig. 1 （b）. Section 2 derives and solves the dynamic equations of a structure with our semi-active friction damper; we point out that eqs. （10） through （13） are the most important. Section 3 gives a numerical example; the results, presented in Figs. 3 through 6, and their analysis show preliminarily that： （ 1 ） our semi-active friction damper significantly reduces the seismic response of the structure; （2） the displacement and interstorey shear force of the structure are much smaller than the structure that does not have our semi-active friction dampers ; （3） the hysteresis loop of our semi-active friction damper is relatively full. All the above implies that our off-on semi-active friction damper has good capability of energy dissipation.