覆冰斜拉索驰振稳定性的理论研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (1) : 122-127.

论文

覆冰斜拉索驰振稳定性的理论研究

李寿英1, 2，黄韬2

作者信息 +

Theoretical Analysis on Galloping Stability of Stay Cables with Iced Accretion

Li Shouying 1, 2, Huang Tao2

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文章历史 +

摘要

覆冰斜拉索可能会发生驰振振动并影响到斜拉桥的安全。在进行风洞试验对6种覆冰拉索模型测力的基础上，推导了覆冰拉索1阶模态驰振的运动微分方程，并采用龙格-库塔法进行求解，得到了拉索的驰振响应规律。以海南洋浦大桥为工程背景，研究了中跨最长拉索M18的驰振临界风速，研究了覆冰长度、拉索阻尼比等对驰振临界风速的影响。结果表明，在新月形、扇形和D形覆冰条件下，中跨最长拉索M18的驰振临界风速在10-15m/s范围内，远小于基本风速，存在发生驰振可能性；随着阻尼比的增加、覆冰长度的变短以及拉索长度的变短，驰振临界风速增加。

Abstract

Galloping vibration may take place on stay cables with iced accretions, which would affect the safety of cable-stayed bridges. Firstly, wind tunnel tests are carried out to measure the mean aerodynamic force coefficients on six kinds of cable models with iced accretion. Then, equation of motion of the first mode is derived, and the galloping responses are obtained by solving the equation by Runge-Kutta method. Taking Yangpu Bridge in Hainan Province, China as engineering background, the galloping critical wind velocity are investigated in detail, as well as the effects of cable damping ratio and iced accretion length. The results show that the galloping critical wind velocities of the longest stay cable M18 at the mid-span of Yangpu Bridge are 10 to 15 m/s, which is far less than basic wind speeds. It means that this cable have the risk of galloping vibration. Moreover, the galloping critical wind velocity increases with the increase of the cable damping ratio and the iced accretion length.

导出引用

李寿英;;黄韬. 覆冰斜拉索驰振稳定性的理论研究[J]. 振动与冲击, 2013, 32(1): 122-127

Li Shouying;;Huang Tao. Theoretical Analysis on Galloping Stability of Stay Cables with Iced Accretion[J]. Journal of Vibration and Shock, 2013, 32(1): 122-127