Variable stiffness control algorithm for high-rising buildings of closely spaced frequencies based on wavelet transforms  

作　　者：滕军 鲁志雄 闫安志 

机构地区：[1]Center of Bridge and Structural Engineering,Harbin Institute of Technology Shenzhen Graduate School [2]Institute of Civil Engineering,Henan Polytechnic University

出　　处：《Journal of Harbin Institute of Technology(New Series)》2010年第5期600-606,共7页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China(Grant No.50478031);China Postdoctoral Science Foundation(Grant No.2006040240)

摘　　要：To establish the algorithm of SAT-TMD system with the wavelet transform(WT),the modal mass participation ratio is proposed to distinguish if the high-rising structure has the characteristic of closely distributed frequencies.A time varying analytical model of high-rising structure such as TV-tower with the SAT-TMD is developed.The proposed new idea is to use WT to identify the dominant frequency of structural response in a segment time,and track its variation as a function of time to retune the SAT-TMD.The effectiveness of SAT-TMD is investigated and it is more robust to change in building stiffness and damping than that of the TMD with a fixed frequency corresponding to a fixed mode frequency of the building.It is proved that SAT-TMD is particularly effective in reducing the response even when the building stiffness is changed by ±15%;whereas the TMD loses its effectiveness under such building stiffness variations.To establish the algorithm of SAT-TMD system with the wavelet transform（WT）,the modal mass participation ratio is proposed to distinguish if the high-rising structure has the characteristic of closely distributed frequencies.A time varying analytical model of high-rising structure such as TV-tower with the SAT-TMD is developed.The proposed new idea is to use WT to identify the dominant frequency of structural response in a segment time,and track its variation as a function of time to retune the SAT-TMD.The effectiveness of SAT-TMD is investigated and it is more robust to change in building stiffness and damping than that of the TMD with a fixed frequency corresponding to a fixed mode frequency of the building.It is proved that SAT-TMD is particularly effective in reducing the response even when the building stiffness is changed by ±15%;whereas the TMD loses its effectiveness under such building stiffness variations.

关 键 词：variable stiffness control semi-active tunable TMD(SAT-TMD) wavelet transforms closely spaced frequencies modal mass participation ratio 

分 类 号：TU7[建筑科学—建筑技术科学] O32[理学—一般力学与力学基础]