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在大跨径悬索桥施工期间,主缆与猫道间存在气动干扰效应,施工期主缆易发生驰振失稳,猫道易发生静风失稳。为了同时保证施工期主缆和猫道的稳定性,以某大跨径悬索桥施工期尖顶型主缆和猫道为背景,采用能够保证施工期主缆驰振稳定性的猫道参数设置方法,利用流体力学软件Fluent和有限元软件ANSYS数值研究了考虑施工期尖顶型主缆影响的猫道三分力系数和静风稳定性。结果表明:主缆施工期不同工况对猫道三分力系数影响较大;猫道静风失稳临界风速随着尖顶型主缆的施工先变小后增大,在成桥阶段又变小;主缆的不同施工顺序既影响主缆施工期的驰振性能又影响猫道静风稳定性,施工时要统筹考虑。
During the construction of the long-span suspension bridge, the aerodynamic interference effect exists between the main cable and the catwalk. During the construction, the main cable is prone to galloping and instability, and the cats are prone to static wind instability. In order to ensure the stability of the main cable and the catwalk at the same time, based on the spire-type main cable and catwalk during the construction of a long-span suspension bridge, the catwalk parameter setting method which can guarantee the stability of main cable galloping during construction is adopted, The third part force coefficient and the static wind stability of the cat road considering the influence of the apexed main cable during the construction period are studied by the use of the fluid dynamics software Fluent and the finite element software ANSYS. The results show that the main windage of the main cable has a great influence on the third-part force coefficient of the catwalk during the construction period. The critical wind speed of the cat static wind instability decreases with the construction of the spire-type main cable and then increases, Small; main cable of different construction order not only affect the performance of the main cable during the gallop vibration performance but also affect the stability of cats static wind, construction should be overall consideration.