| The transmission line has the characteristics of high tower structure,large line span,etc.The wind-induced damage to the transmission towers occurs occasionally under strong winds,causing major economic losses and political and social impact.However,at this stage,domestic and international transmission line related industry specifications still have obvious room for improvement in the value of wind load design,and the value model for the calculation parameters of wind load on transmission lines is too simple and rough,resulting in wind loads on the tower body or wires which deviating from the actual situation.The study of the value and calculation method of the wind load parameters of the transmission tower is the basis of the structural design of the transmission tower.There is an angle between the natural wind and the direction of the transmission line,and the wind load of the transmission tower should be decomposed along the horizontal line to the smooth line during design.The calculation method and decomposition method of the wind load force of the transmission tower under the angle wind has important significance for the structural design of the transmission tower.At present,supporting protection for UHV and long-distance transmission lines has become a key factor in China’s energy transformation strategy.Compared with traditional angle steel transmission towers,aerodynamic coefficients of transmission towers have advantages such as 1)smaller body shape factor;2)larger radius of gyration under the same cross-sectional area;3)relatively simple structure and relatively less steel consumption,so they are currently Transmission line construction has been more and more widely used.In this paper,a series of studies have been conducted on the calculation parameters of the wind load on the tower of aerodynamic coefficients of transmission towers.The specific work and conclusions are as follows:(1)Due to the Chinese regulations,steel tubular towers with different densities and aspect ratios have no value difference in terms of angular wind distribution coefficient,aerodynamic parameters,etc.Therefore,this paper is based on the the typical section section dimensions 1/3 height of SZ27102 aerodynamic coefficients of transmission towers body,designed to produce different aerodynamic coefficients of transmission towers segment models with compactness and aspect ratio,and additionally designed a single piece windward surface truss with corresponding density to adjust the wind speed under uniform flow field and uniform turbulent flow field.The above-mentioned rigid model was subjected to a high-frequency balance force test to obtain the values of each wind load parameter,and the results of the specifications were recommended.(2)This article compares the domestic and foreign norms,proposes the concept of angle wind coefficient and calculation method,and analyzes the influence of compactness,aspect ratio and wind speed(Reynolds number)on the angle wind coefficient of aerodynamic coefficients of transmission towers.In addition,the formula for calculating the wind distribution coefficient of towers of aerodynamic coefficients of transmission towers was deduced,and the wind distribution coefficient of towers under 20 wind directions was measured by a wind tunnel test to study their density,aspect ratio,and wind speed(Reynolds Number)and other factors.(3)In this paper,aerodynamic parameters such as wind truss body shape factor,leeward surface load reduction factor,and tower body shape factor are obtained through wind tunnel tests,and compared with domestic and foreign steel pipe transmission tower design specifications,and suggestions for aerodynamic parameters are proposed. |
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