There are certain differences between design specifications of transmission lines in China and the United States.In order to better adapt to the design of foreign power grid engineering,ASCE 74-2009"Guidelines for Structural Load of Transmission Lines"in the United States and GB 50545-2010"Design Specification for 110 kV～750 kV Overhead Transmission Lines"in China are selected to compare and analyze the parameters such as wind pressure height variation coefficient,shape coefficient,wind load adjustment coefficient and terrain influence factor in wind load calculation formulas.The results show that the coefficient of wind pressure height variation in ASCE 74-2009 is smaller than that of GB 50545-2010.The shape coefficient of conductor and ground wire in GB 50545-2010 is 10% to 20% higher than ASCE guideline value.The gust response factor of ASCE 74-2009 is roughly the same as the tower body wind load adjustment factor in GB 50545-2010.When the design wind speed exceeds 27 m/s,the difference in line wind load adjustment coefficients between these two is small.For special terrains,ASCE 74-2009 considers terrain influence factors,but its application scope in practical engineering is relatively small.There are significant differences in the calculation of wind loads on tower components and conductors and ground wires when they are covered with ice between GB 50545-2010 and ASCE 74-2009,ASCE 74-2009 typically does not consider the impact of increased structural windbreak area caused by icing.
ASCE guidelineswind loadload specificationparameter comparisontransmission line
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万方数据
