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Wind Tunnel Tests on Shape Coefficient and Shielding Factor of Members for Tubular-angle Steel Transmission Tower
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    Abstract:

    The shape coefficient and shielding factor of each member are important in the wind resistant design of the structure for wind sensitive structures such as tubular-angle steel transmission towers. Taking 500 kV and 110 kV transmission towers as the engineering background, the rigid section model of tower body with a scale ratio of 1 ∶ 8.5 and cross-arm with a scale ratio of 1 ∶ 2.5 are designed firstly. Then, through the wind tunnel tests on synchronous pressure measurement of the model under three different wind speeds and different wind incidence angles, the variation rules of shape coefficient and shielding factor of angle and steel pipe members are obtained. On this basis, the shape coefficient distribution of members in the tower body and cross-arm, and the shape coefficients of the section models under different wind incidence angles are summarized. Finally, the results determined by the test are compared with the relevant normative values at home and abroad. The results show that the incoming wind speed has little effect on the shape coefficients of angles in tower body and cross-arm. The shape coefficients of angles in the tower body tend to be small at the top but large at the bottom along the section of tower body under 0° incidence angle. The shielding factors of angles in tower body are consistent with that in the Japanese code JEC. In the test, the difference of the shielding factors of tower body (3.10×104~4.34×104) and cross-arm (5.57×104~8.00×104) under different Reynolds number of main materials is very small. The drag coefficients of tower body and cross-arm are consistent with that in Japanese standard, whereas the values of Chinese standard are 7.2% and 4.5% lower, respectively.

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  • Received:
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  • Online: November 24,2021
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