| 紊流对悬索桥动力特性的影响 |
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| 引用本文： | 佘锟.紊流对悬索桥动力特性的影响[J].应用力学学报,1988(4). |
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| 作者姓名： | 佘锟 |
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| 作者单位： | 上海工程技术大学 |
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| 摘 要： | 文章研究了在风激励下,风中紊流对悬索桥动力特性的影响.悬索桥被处理为一个同时存在有两个相互耦合的振动模态的线性结构.当风高速吹桥时,风中的紊流可认为是一个宽带噪声,因此系统的响应是一个近似的马尔柯夫过程.运用随机平均法,可解出一组伊藤统计微分方程——从而确定系统运动稳定性条件.与只考虑一个振动模态的数学模型相比,本文结论更接近于实验结果.
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| 关 键 词： | 紊流 动力特性 振动模态 运动稳定性 |
EFFECTS OF TURBULENCE ON DYNAMIC BEHAVIOR OF SUSPENSION BRIDGES |
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| She Kun.EFFECTS OF TURBULENCE ON DYNAMIC BEHAVIOR OF SUSPENSION BRIDGES[J].Chinese Journal of Applied Mechanics,1988(4). |
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| Authors: | She Kun |
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| Institution: | Shanghai University of Engineering Science |
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| Abstract: | The purpose of this paper is to analyze the effects of the turbulence in wind on the dynamic behaviors of suspension bridges by modeling the bridge structure as a linear system and considering simultaneously two dominant vibration modes of the bridge. When the wind is oonvected at a high velocity. the turbulence can be assumed to be a wide-banded process and the structure response can be approximated by components of a Markov vector process. Using stochastic average method to solve a set of Ito equations, we can obtain the conditions of the motion stability. The results of this paper is closer to experimental results than those of the one mode model. |
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| Keywords: | turbulence dynamic behavior vibration modes motion stability |
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