斜拉索杠杆质量减振器理论及模型试验研究

PDF(1964 KB)

振动与冲击 ›› 2013, Vol. 32 ›› Issue (13) : 17-22.

论文

斜拉索杠杆质量减振器理论及模型试验研究

王波1,2,3 汪正兴1,2

作者信息 +

Theory and Model Test Research of Cable Lever Mass Damper

WANG Bo1,2,3, WANG Zheng-xing1,2

Author information +

文章历史 +

摘要

为解决斜拉桥跨度增大带来的拉索振动问题，采用杠杆质量减振器(LMD)对斜拉索进行减振。介绍了LMD的构造特性及作用机理，建立了斜拉索-LMD系统振动方程，推导了LMD等效阻尼力模型及LMD与斜拉索各阶模态质量比，并对斜拉索前15阶模态对数衰减率进行了理论计算及模型试验研究。研究结果表明：LMD由于惯性项、刚度项及阻尼项的三重反馈作用，同时由于杠杆的调节放大作用，其减振效果优于相同安装高度的粘性剪切型阻尼器(VSD)。LMD对桥梁景观影响较小、安装维护方便，可为千米级的斜拉桥拉索减振提供更可靠的解决方案。

Abstract

In order to solve the cable vibration problems for span increase of cable-stayed bridge, lever mass damper (LMD) on cable vibration reduction is put forward. The structure characteristics and mechanism of action of LMD is introduced, cable-LMD system vibration equations are established, the LMD equivalent damping force model and the LMD and cable various modal mass ratio are deduced, and the first 15 modes of the cable logarithmic decay rate are researched through the theoretical calculation and model test. The results show that: due to inertia, stiffness and damping of these three feedback function, at the same time as the adjusting lever amplification effect, and the damping effect of LMD is better than the same installation height of the viscous shearing damper. Because of the better bridge landscape effect, installation and maintenance, LMD provides a reliable solution for the vibration control of stayed cable of a cable-stayed bridge with thousand-meter scale span.