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Aerodynamic stability of iced stay cables on cable-stayed bridge

机译：斜拉桥上的斜拉索的空气动力学稳定性

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摘要

Ice accretions on stay cables may result in the instable vibration of galloping, which would affect the safety of cable-stayed bridges. A large number of studies have investigated the galloping vibrations of transmission lines. However, the obtained aerodynamics in transmission lines cannot be directly applied to the stay cables on cable-stayed bridges. In this study, linear and nonlinear single degree-of-freedom models were introduced to obtain the critical galloping wind velocity of iced stay cables where the aerodynamic lift and drag coefficients were identified in the wind tunnel tests. Specifically, six ice shapes were discussed using section models with geometric scale 1:1. The results presented obvious sudden decrease regions of the aerodynamic lift coefficient for all six test models. Numerical analyses of iced stay cables associated to a medium-span cable-stayed bridge were carried out to evaluate the potential galloping instability. The obtained nonlinear critical wind velocity for a 243-meter-long stay cable is much lower than the design wind velocity. The calculated linear critical wind velocity is even lower. In addition, numerical analyses demonstrated that increasing structural damping could effectively mitigate the galloping vibrations of iced stay cables.
机译：斜拉索上积冰可能会导致舞动不稳定，从而影响斜拉桥的安全性。大量研究已经研究了传输线的疾驰振动。然而，在传输线中获得的空气动力学不能直接应用于斜拉桥上的斜拉索。在这项研究中，引入了线性和非线性单自由度模型来获得在风洞试验中确定了气动升力和阻力系数的冰缆斜拉索的临界风速。具体来说，使用截面比例为1：1的截面模型讨论了六个冰块形状。结果表明，所有六个测试模型的空气动力学升力系数均出现明显的突然减小区域。进行了与中跨斜拉桥相关的冰缆斜拉索的数值分析，以评估潜在的驰in不稳定性。对于243米长的斜拉索，获得的非线性临界风速远低于设计风速。计算出的线性临界风速甚至更低。此外，数值分析表明，增加结构阻尼可以有效减轻冰缆斜拉索的驰豫振动。

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