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| Effect of helical line on the aerodynamic force and stability of stay cables |
| LIU Qingkuan1,2，WANG Xiaojiang3，LU Zhaoliang3，HU Bo4，MA Wenyong1,2 |
1.Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University, Shijiazhuang, 050043, China;
2. Hebei Province Key Lab of Structural Health Monitoring and Control, Shijiazhuang, 050043, China;
3.Shool of Civil Engineering Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
4. Department of Engineering Mechanics Shijiazhuang Tiedao University, Shijiazhuang 050043, China |
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Abstract The helical line on the surface of cables can effectively suppress the wind and rain excitation on the cables, but it will change its aerodynamic shape. A vibration test system for stay cables was designed to study the effects of different parameters of helical lines on the aerodynamic stability of oblique cables, and 25 kinds of helical line models for 120 mm-diameter stay cables were tested for vibrations in a wind tunnel.The relationship of the equilibrium positions and average lift coefficients of stay cables with the Reynolds numbers were analyzed.According to the results, with the same diameter of helical line, the smaller the helical line winding distance is, the smaller the lift force of the cable model is, and the smaller the equilibrium position offset is. With the same helical line winding distance, the average lift forces and the equilibrium position offset of stay cables become smaller with the increase of helical line diameter. The effect of the change of another parameter on the equilibrium position offset becomes small with the decrease of helical line winding distance or the increase of helical line diameter. And the larger the helical line winding distance is, the worse the equilibrium position stability is.
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Received: 19 June 2017
Published: 15 March 2019
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