影响调谐质量阻尼器减振效果的因素分析  

Impact parameters analysis on damping effect of tuned mass damper

作　　者：朱亚光[1] 徐培蓁[1] 张厚建 祝令民 左斌[1] 李青[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《四川建筑科学研究》2015年第4期58-61,158,共5页Sichuan Building Science

基　　金：国家自然科学基金(50808104);山东省自然科学基金(ZR2010EM010);青岛市公共领域科技支撑计划项目(12-1-3-55-nsh)

摘　　要：通过分析行人激励对人行天桥的振动影响,探讨了调谐质量阻尼器(简称TMD)的质量比、阻尼比、频率、外激励频率、主结构阻尼比等参数对减振效果的影响。结果表明,越高的TMD质量比能得到越好的减振效果;TMD减振效果对频率变化较为敏感,TMD频率偏离最优频率10%时,加速度响应相对最优频率时增加超过110%;TMD的阻尼比偏离最优阻尼时,TMD系统采用高阻尼相对低阻尼更容易获得较好的减振效果;外激励频率的变化不影响TMD对人行桥的振动控制效果;较高的主结构阻尼比会降低TMD的减振效果。A finite element model of a pedestrian bridge was established. The influence factors on damping effect of tuned mass damper （TMD） was analyzed, the parameters included the mass ratio, the damping ratio and the frequency of TMD, the frequency of external excitation, the main structural damping ratio, etc. The results showed that the bigger mass ratio of the TMD, damping effect was better; the damping effect was so sensitive to frequency that the acceleration increased more than 110% comparing with that of optimal parameters when the frequency deviated 10% from the optimal. When TMD damping ratio deviated from the optimum damping, high damping was easier to get the better effect of vibration control than lower damping. The change of external excitation frequency did not affect the vibration control effect of footbridge under TMD ; higher main structural damping reduced the damping effect of TMD.

关 键 词：人行天桥 振动控制 质量调谐阻尼器 减振效果 加速度响应 

分 类 号：TU997[建筑科学—市政工程]