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| Tests for average aerodynamic drag characteristics of stay cables with surface damage |
| LIU Qingkuan1, 2, ZHANG Leijie3, WANG Xiaojiang3, JIA Yaya1, 2,HU Bo4, MA Wenyong1, 2, LIU Xiaobing1, 2 |
1. Structural Health Monitoring Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2. Hebei Provincial Key Lab of Structural Health Monitoring, Shijiazhuang 050043, China;
3. School 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 Stay cables as important load-bearing members of a cable-stayed bridge, their wind load design is of great significance in anti-wind design of bridges. These cables may be damaged during production, transportation, installation and operation. Here, through wind tunnel tests, aerodynamic drag characteristics of stay cables with different degrees of surface damage were studied. Effects of damage degree in subcritical, critical and supercritical Reynolds number regions on stay cable aerodynamic drag were studied, respectively to obtain the calculation method of damaged stay cable aerodynamic drag. The results showed that within a certain region of wind directions, cable surface damage has significant effects on its aerodynamic drag; in subcritical region, drag coefficient of surface damage model is larger than that of smooth model; after entering critical area, drag coefficient of surface damage model is smaller than that of smooth model; in supercritical area, both of them are close to each other; with increase in scratch depth, initial Reynolds number in critical area is in advance, and in critical Reynolds number region, drag coefficient decreases with increase in Reynolds number; drag coefficients of cables damaged with different degrees are fitted to gain the corresponding calculation formulas convenient to the aerodynamic drag estimation of stay cables.
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Received: 28 June 2018
Published: 28 December 2019
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