采用阵风荷载因子法推导了不同档数、影响线函数下输电线路导线阵风响应系数的计算公式，研究了湍流积分尺度、风速、档距、共振响应分量、分离系数和峰值因子等因素对导线阵风响应系数的影响规律，对并将其与现行ASCE规范和中国规范的导线阵风响应系数进行了比较分析。分析结果表明，计算导线跨中位移和输电塔风致响应时，应分别考虑单档和相邻两档导线上的风场不完全相关性。影响线函数采用线性曲线或正弦曲线时，其差异对导线阵风响应的影响可以忽略。与风速和湍流积分尺度相比，档距对导线阵风响应系数的影响更为显著，档距由100m增至1000m时，导线阵风响应系数至少降低了20%。忽略导线共振响应分量影响，导线阵风响应系数会偏小5%以上。峰值因子对导线阵风响应的影响较为显著，峰值因子按照ASCE规范取3.6比按照DL/T 5551-2018规范取2.5计算得到的导线阵风响应系数高8.6%。
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%.
关键词
阵风响应 /
联合接纳函数 /
档距 /
湍流积分尺度 /
影响线
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Key words
gust response /
joint acceptance function /
span /
turbulence scale /
influence line
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