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| Test study on aerodynamic performance of a side main beam cable-stayed bridge with high anti-throwing net |
| LI Qianming1, LI Chunguang2, MA Xingchuan1, LONG Junxian1, CHEN Yinwei1 |
| 1.China Railway Major Bridge Reconnaissance and Design Institute Co., Ltd., Wuhan 430074, China;
2.School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China |
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Abstract In order to study the aerodynamic performance for a side beam cable-stayed bridge with high anti-throwing net, taking a cable-stayed bridge with high anti-throwing side girder as engineering background, the aerodynamic stability performance of cable-stayed bridge with high anti-throwing side girder is comprehensively studied through section model and aeroelastic model wind tunnel test, and reasonable aerodynamic optimization measures are determined. Wind-induced vibration responses of girders at different angles of attack are tested in a 1:50 scale sectional model wind tunnel test. Especially at the most unfavorable angle of attack, the eddy vibration performance was optimized by changing the ventilation rate of the shield and the turbulent intensity of the wind field. A 1:100 scale aeroelastic model was designed and fabricated. Wind tunnel tests were carried out in different surface wind field types. The eddy vibration characteristics of the full-bridge aeroelastic model at various angles of attack and deflection were studied and compared with the section. Wind tunnel test results show that the combination of anti-throw netting with 60% air permeability and 5% turbulence can effectively control the eddy vibration. The aeroelastic model considering three-dimensional effect conforms to the overall rule of the test results of the section model, but the eddy vibration response is lower than that of the slightly section model, at the same time, the wind speed range of the eddy vibration becomes narrower and shifts to the low wind speed range.
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Received: 16 May 2022
Published: 15 September 2023
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