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导线风压不均匀系数用于表征在较大档距内不均匀分布的风荷载。当前国内外采用的导线风压不均匀系数计算方法大致分为两类:一类不区分脉动风与平均风对风压不均匀系数的影响,笼统地采用一个系数予以表征;一类仅考虑脉动风不均匀性的影响。在对美国ASCE的导线阵风响应系数、Davenport档距系数以及中日德三国风压不均匀系数的计算方法对比分析的基础上,结合实测数据,首先证明了平均风不均匀性的存在,随后以Davenport档距系数计算理论为基础,提出了一种新的风压不均匀系数计算方法。该方法明确区分了平均风与脉动风不均匀性对整档导线风压的影响,考虑影响因素全面,物理意义更为明确。
Unevenness of the conductor air pressure is used to characterize wind loads that are unevenly distributed over a larger span. Currently, there are two types of methods for calculating the non-uniform coefficient of wind pressure at home and abroad: one is the effect of undivided wind and the average wind on the non-uniform wind pressure coefficient, and is generally characterized by a factor; The impact of wind inhomogeneity. Based on the comparison and analysis of the calculation method of ASG’s gust gust response factor, Davenport stall distance coefficient and wind pressure nonuniformity coefficient in China, Japan and Germany, the paper first verifies the existence of mean wind inhomogeneity, Davenport, the paper proposes a new method to calculate the coefficient of uneven wind pressure. The method makes a clear distinction between the influence of average wind and pulsating wind inhomogeneity on the wind pressure of the whole cable, considering the comprehensive influencing factors and the physical meaning more clearly.