全方位角度风作用下铁塔风荷载分配系数特性研究

摘要

An accurate determination of wind loads is a key element of the transmission tower design.The selection of the wind load distribution coefficient has a direct impact on design specifications of the tower.This paper reviews and analyzes the principles for calculating the wind load on the tower body and the cross-arm in accordance with the design standards.Based on the analysis of the wind load on the tower body and the cross-arm following IEC60826 and BS50341 standards,a calculation formula for wind load distribution coefficient is derived with 0-360 wind angles and the wind load distribution coefficients are calculated for different projected area ratios.In addition,the characteristics of the wind load distribution coefficient of the tower body and the cross-arm are analyzed and compared.Through the research,the characteristics of transmission tower wind load distribution coefficient are developed and the results can be used as references for the transmission tower design.%准确确定铁塔风荷载是输电铁塔设计的关键一环,全方位角度风荷载分配系数的选取是否合理将直接影响到铁塔的设计指标.在对规范中塔身、横担风荷载的计算原理进行梳理和分析的基础上,通过对IEC 60826和BS 50341规范中关于塔身和横担风荷载的剖析,推导了线路前后侧塔身和横担360°风吹时角度风荷载分配系数计算公式,给出了不同正侧面投影面积比值时的角度风荷载分配系数,分析了分配系数的特点.通过对比研究揭示了塔身和横担角度风荷载分配系数的特点,研究结果可作为输电杆塔抗风设计的一种参考.