385m高大跨越输电塔塔身和横担的体型系数和角度风系数
Shape coefficients and skewed wind loading factors of tower body and cross-arm of a 385 m-high long-span transmission tower
朱姣 1李布辉 2季天程 1沈国辉 3沈文韬1
作者信息
- 1. 国网江苏省电力有限公司建设分公司,江苏南京 210024
- 2. 中国能源建设集团江苏省电力设计院有限公司,江苏南京 211102
- 3. 浙江大学建筑工程学院,浙江杭州 310058
- 折叠
摘要
针对某385 m高大跨越输电塔塔身和横担进行测力风洞试验,获得塔身和横担的气动力系数,给出塔身、上横担和下横担的体型系数和角度风分配系数,并与各国规范的规定值进行对比.研究表明,有井筒塔身的阻力系数小于不带井筒塔身的阻力系数,其原因为井筒受到塔身的显著遮挡;无井筒塔身的体型系数和GB、DL/T、AS/NZS规范接近,小于ASCE规范值;塔身顺线路方向的角度风分配系数在10°～15°风向出现最大值,各国规范中均没有体现;横担的体型系数比GB、DL/T和AS/NZS规范略大;横担顺线路方向的角度风分配系数和BSEN规范结果非常接近.
Abstract
In this research,force balance-based wind tunnel tests on the tower body and cross-arm of a 385 meter-high long-span transmission tower were carried out.The aerodynamic force coefficients on tower body and cross-arm are obtained.Then the shape coefficients and skewed wind loading factors of the tower body,upper cross-arm and lower cross-arm are calculated and compared with those regulated in the codes of different countries.Results show that the shape coefficient of tower body with shaft is less than that of the tower body without shaft,due to the obscuring effect of the tower body on the shaft.The shape coefficient of tower body without shaft is almost equaled with those regulated in the GB,DL/T as well as AS/NZS codes and smaller than that in the ASCE code.The skewed wind loading factors in the tower body along the line reach their maximum value in the 10°-15° azimuths,which is not shown in any code.The shape coefficient of the cross-arm is larger than those regulated in the GB,DL/T and AS/NZS codes.The skewed wind loading factors in the cross-arm along the line direction is quite close to those in the BSEN code.
关键词
大跨越输电塔/风洞试验/体型系数/角度风分配系数/测力天平Key words
long-span transmission tower/wind tunnel test/shape coefficient/skewed wind loading factor/force balance引用本文复制引用
基金项目
国家电网有限公司科技项目(SGJSJSOOXMJS2000258)
国家自然科学基金项目(52178511)
出版年
2024
NETL
NSTL
万方数据