格构式钢管输电塔架的体型系数和雷诺数效应OA北大核心CSTPCD

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 ϕ 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.