Stability of Bridge Motion in Turbulent Winds
Stability of Bridge Motion in Turbulent Winds
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DOI：
10.1080/03601218008907350
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
Y. Lin;S. Ariaratnam
中科院分区：
文献类型：
--
作者：
Y. Lin;S. Ariaratnam
研究表明，风速湍流改变了悬索桥运动的稳定性条件。当湍流以较高的速度对流时，与静止结构相比，随机激励场的时间变化变得很快。在这种情况下，结构响应可以用马尔可夫向量过程的分量来近似。将结构建模为线性系统，只考虑主导扭转振型，根据平均风速和湍流分量的谱水平，得到了一阶和二阶随机矩的稳定边界。
ABSTRACT Turbulence in wind velocity is shown to change the stability condition for the motion of suspension bridges. When the turbulence is convected at a high velocity, the time variation of the random excitation field becomes fast as viewed by the nonmoving structure. In this case the structural response can be approximated by components of a Markov vector process. Modeling the structure as a linear system and considering only the dominant torsional mode, the stability boundaries for the first and the second stochastic moments are obtained in terms of the mean wind velocity and the spectral level of the turbulence component.