WIND-INDUCED VIBRATION CONTROL FOR ELECTRICAL TRANSMISSION TOWERS BY USING LEAD VISCOELASTIC DAMPERS
YIN Peng LI Li LIANG Zheng-ping(School of Civil-Engineering & Mechanics, Huazhong University of Sci. & Tech., Wuhan 430074,China)
The example of Jindongnan-Nanyang-Jingmen 1000kV transmission line system shows that the structure is super flexible and wind-sensitive so that analysis of wind-resistant capacity of the system must be performed. Based on a certain project, the lead viscoelastic dampers with lead double layers of glue elastic material and inside are used to control the wind performance. The structure is preliminarily designed as that lead viscoelastic dampers are installed at the tower pole parallel to the angle steel to avoid weakening of tower pole. According to the project requirement, lead viscoelastic dampers are laid in seven schemes on single tower or tower-line coupling system. A computer program compiled is used to simulate the fluctuating wind velocity. The time history analysis method is used in the seven schemes to calculate the wind-induced response of single tower or tower-line coupling system, and the effects of wind-induced vibration control in time domain are investigated. The result shows the efficiency of the control system and some theoretical bases are provided for advanced experimental research and for correct installing of dampers.
【CateGory Index】： TU347;TU311.3