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Extreme value of typhoon-induced non-stationary buffeting response of long-span bridges

机译：台风引起的大跨度桥梁非平稳抖振响应的极值

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摘要

This paper concerns the extreme value of typhoon-induced non-stationary buffeting response of long-span bridges. The framework of non-stationary buffeting analysis is briefly introduced first, in which the non-stationary buffeting response is regarded as the summation of a time-varying mean response and a dynamic response that can be represented by a zero-mean evolutionary Gaussian process characterized by an evolutionary power spectral density (EPSD) function. The formulas for determining approximate probabilistic characteristics of extreme non-stationary responses are then derived by extending the currently-used Poisson and Vanmarcke approximations. By comparing with the Monte Carlo solution, the extended approximations for extreme value of non-stationary responses are found reliable and accurate enough. Particularly, the extended Vanmarcke approximation can give closer results to the Monte Carlo solution than the extended Poisson approximation. The extended Vanmarcke approximation is finally applied to the Stonecutters Bridge to find the extreme value of non-stationary buffeting response of the bridge to a strong typhoon. The results show that the extreme displacement responses of the bridge from the non-stationary buffeting analysis are larger than those predicted by the conventional stationary buffeting analysis, and therefore the non-stationary buffeting analysis is necessary.
机译：本文关注的是台风引起的大跨度桥梁非平稳抖振响应的极值。首先简要介绍了非平稳抖振分析的框架，其中，非平稳抖振响应被视为时变平均响应和动态响应的总和，该响应可以用零均值演化高斯过程表示。由进化功率谱密度（EPSD）函数决定。然后，通过扩展当前使用的Poisson和Vanmarcke逼近来推导确定极端非平稳响应的近似概率特征的公式。通过与蒙特卡洛解决方案进行比较，发现非平稳响应极值的扩展近似值足够可靠和准确。特别是，扩展的Vanmarcke逼近比扩展的Poisson逼近可以提供更接近Monte Carlo解的结果。最后，将扩展的Vanmarcke逼近方法应用于昂船洲大桥，以发现大桥对强台风的非平稳抖振响应的极值。结果表明，非平稳抖振分析所预测的桥梁极限位移响应要大于常规平稳抖振分析所预测的极限位移响应，因此需要进行非平稳抖振分析。

著录项

  • 作者

    Hu L; Xu YL;

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  • 年度 2014
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  • 原文格式 PDF
  • 正文语种 eng
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