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格构式钢管输电塔架的体型系数和雷诺数效应
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Shape Coefficient and Reynolds Number Effect of Lattice Tubular Transmission Towers
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    摘要:

    采用天平测力风洞试验获得亚临界范围钢管塔架的体型系数,研究塔架体型系数随密实度的变化特征,基于规范数据拟合体型系数从亚临界到超临界条件下的雷诺数折算系数,基于试验结果开展塔架体型系数与规范值的对比. 试验结果表明,相同密实度下横担的体型系数大于塔身,其原因为横担杆件长细比以及杆件前后的等效间距比均较大;在亚临界条件下塔身体型系数试验值与JEC-TR-00007—2015、DL/T 5551—2018 和GB 50009—2012规范值接近,而横担体型系数大于各国规范值;亚临界和超临界条件下各国规范的钢管塔架体型系数随着密实度?的增加而降低,使用最小二乘法拟合获得雷诺数折算系数为0.63+0.72?;在超临界条件下,塔身的体型系数与DL/T 5551—2018、GB 50009—2012 规范结果接近,横担的体型系数与IEC 60826—2017和ASCE MOP 74—2020规范结果接近.

    Abstract:

    The force balance wind tunnel testing method was employed to obtain the shape coefficients of lattice tubular towers in the subcritical regime. Then, the variation characteristic of the shape coefficients of the tower versus the solidity ratio is analyzed. The Reynolds number reduction coefficient of the lattice tubular tower from the subcritical regime to the supercritical regime is fitted based on the data of the codes. Finally, the shape coefficients of the lattice tubular tower obtained from the wind tunnel tests are compared with those regulated in the codes. Experimental results show that the shape coefficient of the cross-arm is larger than that of the tower body under the same solidity ratio, because the rod of cross-arm has a higher slenderness ratio and the equivalent spacing between front and back surfaces is larger. In the subcritical regime, the shape coefficient of the tower body is close to that specified in the JEC-TR-00007—2015、DL/T 5551—2018 、GB 50009—2012 codes, whereas the shape coefficient of the cross-arm is larger than that specified in the codes. The shape coefficients of the lattice tubular tower regulated in various countries’ codes decrease with the increase of the solidity ratio in the subcritical and supercritical regimes. Then, the reduction coefficient of Reynolds number is obtained as 0.63+0.72 ? using the least square fitting method. In the supercritical regime, the shape coefficients of the tower body are close to that specified in the DL/T 5551—2018 and GB 50009—2012 codes, and the shape coefficients of the cross-arm are close to that specified in the IEC 60826—2017 and ASCE MOP 74—2020 codes.

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沈国辉 ?,李懿鹏 ,赵英能 ,韩康辉 ,郭勇 .格构式钢管输电塔架的体型系数和雷诺数效应[J].湖南大学学报:自然科学版,2024,(3):31~38

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  • 在线发布日期: 2024-04-02
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