斜拉索杠杆质量减振器理论及模型试验研究  

Theory and model test for a cable lever mass damper

作　　者：王波[1,2,3] 汪正兴[1,2] 

机构地区：[1]中铁大桥局集团武汉桥梁科学研究院有限公司,武汉430034 [2]桥梁结构安全与健康湖北省重点实验室,武汉430034 [3]武汉大学土木工程博士后流动站,武汉430072

出　　处：《振动与冲击》2013年第13期17-22,共6页Journal of Vibration and Shock

基　　金：江西省交通运输厅科技项目(2010C00005);武汉市青年科技晨光计划项目(2013070104010037)

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。In order to solve cable vibration problems due to span increase for a cable-stayed bridge,a lever mass damper（LMD） for cable vibration reduction was proposed.The structural characteristics and action mechanism of a LMD were introduced,the cable-LMD system＇s vibration equations were established.The equivalent damping force model of LMD and the modal mass ratios of LMD and the cable were deduced,and the cable logarithmic decay rates of the first 15 modes were studied through theoretical calculations and model tests.The results showed that due to three feedback functions of LMD inertia,stiffness and damping,and the adjusting amplification effect of the cable,the vibration reduction effect of LMD is better than that of a viscous shearing damper with the same installation height.Because of the better bridge landscape effect,and convenience for installation and maintenance,LMD provided a reliable solving scheme for cable vibration control of a cable-stayed bridge with thousand-meter scale span.

关 键 词：斜拉索 杠杆质量减振器 对数衰减率 模态质量比 

分 类 号：TU311[建筑科学—结构工程] O327[理学—一般力学与力学基础]