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

TENG Jun¹, LU Zhi-xiong¹, YAN An-zhi²

1.Center of Bridge and Structural Engineering,Harbin Institute of Technology Shenzhen Graduate School,Shenzhen 518055,China;2.Institute of Civil Engineering,Henan Polytechnic University,Jiaozuo 454100,China



Abstract:

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.

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

DOI：10.11916/j.issn.1005-9113.2010.05.002

Clc Number:TU352.13

Fund: