Effects of 3D Wind Flow on Drag Coefficients of Stay Cables
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摘要: 为了考察三维绕流对斜拉索阻力系数的影响,设计了节段支撑模型和斜拉索阻力系数测试系统.对不 同直径、不同姿态角的斜拉索,研究了表面形式、水平倾角、风向偏角、紊流度等因素对阻力系数的影响.结果表 明:当风向角约为0曘时,阻力系数随着水平倾角的增大而增大,当风向角为90曘时,水平倾角的变化对阻力系数影 响不大;在较高风速下,斜拉索表面压花或附着螺旋肋条使阻力系数增加了1~2倍,且肋条越高、压花表面覆盖 率越大,阻力系数越大;紊流度对光面索阻力系数影响显著.Abstract: Models of stay cable sections and a corresponding drag coefficient testing system were designed to investigate the effects of cable surface pattern, inclination and yaw angles, and wind turbulence intensity on drag coefficient of the stay cables under 3D wind flows. Wind tunnel test indicates that the drag coefficient increases with an increase in the inclination angle when the yaw angle is about 0°, but it has a little change when the yaw angle is about 90°. The drag coefficient of dimpled cables or cable with helical strakes increases about twice compared with that of smooth cables, and the greater the ratio of dimpled area to the whole surface area and the higher the helical strakes, the larger the drag coefficient. The turbulence intensity has significant effect on the drag coefficient for a smooth cable.
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Key words:
- stay cable /
- drag coefficients /
- section model /
- wind tunnel test
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