摘要
对比分析了现行国内外关于输电铁塔背风面风荷载降低系数η取值规定的规范,考虑挡风系数、宽高比等参数影响,分别设计了角钢、钢管、钢管与角钢组合输电铁塔塔身模型并进行风洞试验,获得了不同模型迎风面、背风面的体型系数和背风面风荷载降低系数η,分析了背风面风荷载降低系数随挡风系数和高宽比的变化规律。结合CFD分析和风洞试验结果,确定了钢管断面结构和角钢断面结构背风面遮挡效应的差异,挡风系数和宽高比相近时,角钢塔身与钢管塔身η值最大相差29.1%。对于角钢塔身和钢管与角钢组合塔身,背风面风荷载降低系数η试验值分别比中国规范计算值低23.3%-34.2%和6.9%-10.9%;钢管塔身试验值与中国规范计算值较为接近。
The regulations on the shielding factor η in different applicable standards were compared and analyzed. By considering the effects of solidity ratio, the ratio of the width to the height, the angle steel model, the tubular steel model and the tubular-angle steel model of tower bodies were designed and manufactured. According to the results of wind tunnel tests, the shape coefficients of the windward side and the teeward side of wind tunnel test models were obtained. The varying trends of the shielding factors with the solidity ratio and the ratio of the width to the height were analyzed. Based on the experimental results and the computational fluid dynamic （CFD） analysis results, the shielding effects of the tubular steel tower bodies and angle steel tower bodies were separately determined. Under the approximately same solidity ratio and the ratio of the width to the height, the maximum difference of 71 for angle steel and tubular steel tower bodies is 29.1%. For angle steel tower bodies and tubular-angle steel tower bodies, the experimental values of shielding factor η are lower than the calculated values by Chinese standard by about 23. 3% to 34. 2% and 6. 9% to 10. 9%, respectively. For tubular steel tower bodies, the experimental values are close to the calculated values by Chinese standard.
出处
《振动工程学报》
EI
CSCD
北大核心
2016年第2期276-283,共8页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(51408568)
关键词
输电铁塔
塔身
遮挡效应
CFD分析
风洞试验
transmission tower
tower body
shielding effect
CFD analysis
wind tunnel test
