Synchronous test study of two adjacent transmission tower undergoing ambient excitation

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (11) : 155-158.

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Synchronous test study of two adjacent transmission tower undergoing ambient excitation

HE Min-juan1;YAN Xiang-mei1;ZHANG Yi-guo2;MA Ren-le1

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Abstract

The ambient vibration testing of two adjacent transmission towers were carried out based on the theory of random vibration and system identification, identifying the vibration mode of the two adjacent towers coupled cable effects and transverse & vertical vibration frequencies of the insulators. The experimental result indicates: two adjacent tangant towers have the same dynamic properties basically. The span of transmission tower has little effect on its dynamic feature at the same initial stress. Damping ratio of the two transmission towers are more than 0.01 which is recommended by the Code for Design of High-rise Structures. It is further indicated that the natural frequencies of the insulators are different to those of towers in both longitudinal and lateral direction. This is not beneficial for the wind-excited dynamic responses of transmission tower-line system.

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transmission line system / coupled effects / ambient vibration testing / mode identification

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HE Min-juan;YAN Xiang-mei;ZHANG Yi-guo;MA Ren-le. Synchronous test study of two adjacent transmission tower undergoing ambient excitation[J]. Journal of Vibration and Shock, 2009, 28(11): 155-158