摘要
高耸结构在地震、强风或其它激励的作用下易发生大幅振动甚至倒塌,由于缺少阻尼器理想的安装位置,目前直接采用阻尼器对结构进行减振的效果并不理想。垂度阻尼索利用高耸结构与地面之间的相对位移,经过放大后驱动阻尼器进行耗能减振,是阻尼器对高耸结构减振的新尝试。为了研究垂度阻尼索对高耸结构的减振性能,首先制作了黏性阻尼系数可调节的电涡流阻尼器,并通过试验结果获得其黏性阻尼系数与磁铁数量的关系;然后采用主索、电涡流阻尼器和复位弹簧制作垂度阻尼索,并对模型结构进行了减振试验。研究结果表明:垂度阻尼索对高耸结构减振的效果随主索垂度减小而增大,随阻尼器黏性系数增大而增大,为结构提供的附加阻尼比可达30%以上,远大于现有减振措施所能提供的附加阻尼比。
High-rise structures’large amplitude vibrations and collapses easily happen under the action of earthquake,strong wind or other excitation.High-rise structures’vibration reduction effect is not efficient using dampers directly at present due to the lack of ideal installation position of dampers.Sag damping cable is used to amplify the relative displacement between ground and high-rise structures and drive dampers for dissipating vibration energy of high-rise structures.This is a new attempt to reduce vibration of high-rise structures with dampers.Here,in order to investigate vibration reduction performance of sag damping cable for high-rise structures,an eddy current damper with adjustable viscous damping coefficients was developed,and the relationship between viscous damping coefficient and magnet number was obtained with test results.Then a sag damping cable was made with a main cable,an occurrence reset spring and an eddy damper.Vibration reduction test was conducted using the sag damping cable for a model structure.The results showed that the vibration reduction effect of the sag damping cable for high-rise structures increases with decrease in its main cable’s sag and increase in damper’s viscous damping coefficient;the additional damping ratio supplied by the sag damping cable for high-rise structures can reach more than 30%,this ratio is much larger than that provided by current other vibration reduction measures.
作者
禹见达
彭临峰
张湘琦
彭剑
陈政清
YU Jianda;PENG Linfeng;ZHANG Xiangqi;PENG Jian;CHEN Zhengqing(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Lab of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Lab for Wind and Bridge Engineering,Hunan University,Changsha 418002,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第19期39-44,共6页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(11402085)
湖南省教育厅科学研究重点项目(17A071)
关键词
高耸结构
振动控制
电涡流阻尼器
阻尼索
试验研究
high-rise structure
vibration control
eddy current damper
sag damping cable
test
作者简介
第一作者,禹见达,男,博士,副教授,1971年生E-mail:yugada@163.com
