Research on Gust Response Factor and Wind-Resistance Performance of Transmission Lines Under Typhoon

doi:10.12068/j.issn.1005-3026.2022.07.001

Abstract

Abstract: To study the gust response factors(GRF) of transmission lines under normal wind and typhoon， a finite element model is established based on a steel tower of the Guogu line in Guangdong Province. The typhoon wind field is simulated via a harmonic superposition method， and the dynamic analysis is carried out. First， the GRF methods in five design codes at home and abroad are compared. It turns out that none of them considers the strong fluctuating characteristics of typhoon. Then， the GRF is obtained based on the inertia force method， and the tower-line coupling effect on GRF is studied. Finally， the wind-resistance performance of the transmission line under the two wind fields is quantitatively evaluated by the method of birth to death element. The results showed that the high turbulence characteristics of typhoons lead GRF to be greater than that of normal wind and the conductor can increase the natural frequency of the tower in the cross-wind direction， changing the mode from the bending type of a single tower to the bending-shear type of the tower-line system， whose GRF at the cross arm is greater than that of a single tower. The critical collapse wind load will decrease by 11% if the turbulence intensity increases from 0.14 to 0.20. Thus， the design of transmission towers in typhoon-prone areas should properly increase the turbulence intensity and take into account the tower-line coupling effect when necessary.

Key words: transmission line; gust response factor; typhoon; tower-line coupling effect; wind-resistance performance evaluation

CLC Number:

TM753

FU Xing， DU Wen-long， ZHENG Shuai， LI Hong-nan. Research on Gust Response Factor and Wind-Resistance Performance of Transmission Lines Under Typhoon[J]. Journal of Northeastern University(Natural Science), 2022, 43(7): 913-920.

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