Gust response coefficients of transmission line conductor

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (5) : 85-91.

YANG Fengli, ZHANG Hongjie, WANG Fei, HUANG Guo

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Abstract

With different span numbers and influence line functions, calculation formulas of gust response factors for transmission line conductors were derived based on the gust load factor method. By considering the parameters of turbulence scale, span, wind speed, resonant response term, approximate separation coefficient and statistical peak factor, effect rules on the conductor gust response factors were studied. The calculated gust response factors by the approved methods were compared with values regulated in the applicable ASCE standard and Chinese standard. For calculating the conductor middle point displacement and the transmission tower wind induced responses, incomplete spatial correlation characteristics in one span and adjacent two spans conductor should be considered respectively. The difference of linear influence line function and sinusoidal influence line function has little effect on the conductor gust responses. Comparing with wind speed and turbulence scale, conductor span has more significant effect on gust response factors. The gust response factors decrease by at least 20% when the span is changing from 100m to 1000m. If the resonant response term of conductors was neglected, the conductor gust response factor would decrease by more than 5%. When the statistical peak factor is equal to 3.6 and 2.5 according to ASCE standard and DL/T 5551-2018 standard separately, the conductor gust response factor increases by about 8.6%.

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gust response / joint acceptance function / span / turbulence scale / influence line

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YANG Fengli, ZHANG Hongjie, WANG Fei, HUANG Guo. Gust response coefficients of transmission line conductor[J]. Journal of Vibration and Shock, 2021, 40(5): 85-91

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