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首页> 外文期刊>Journal of Wind Engineering and Industrial Aerodynamics: The Journal of the International Association for Wind Engineering >Influence of uncertainty in selected aerodynamic and structural parameters on the buffeting response of long-span bridges
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Influence of uncertainty in selected aerodynamic and structural parameters on the buffeting response of long-span bridges

机译：选定的空气动力学和结构参数的不确定性对大跨度桥梁的抖振响应的影响

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摘要

Multimode-analysis methods for the study and derivation of flutter instability and buffeting response are readily available from the literature and have been successfully applied to the assessment of the susceptibility of long-span bridges to wind loading. In both cases flutter critical velocity and buffeting oscillation are usually estimated from deterministic analyses. However, the probabilistic nature of the problem is latent since uncertainties, especially those associated with the definition of wind and aerodynamic characteristics, are intrinsically present. These quantities include, for example, wind-turbulence power spectral density, static coefficients and aerodynamic derivatives, usually derived from either site observations or experimental analysis. Their effects are often neglected or usually addressed through sensitivity analyses only. While in the past uncertainty in flutter estimates has been analyzed by researchers (for example through reliability analysis), little attention has been devoted to buffeting. In this paper the effects associated with the random nature of wind and structural characteristics are analyzed through the derivation of a closed-form solution associated with the single-mode buffeting problem with selected random parameters. A specific example is provided to clarify the role of wind power spectral density, damping and selected aeroelastic derivatives. (C) 2007 Elsevier Ltd. All rights reserved.
机译：用于研究和推导颤振不稳定性和抖振响应的多模分析方法已经很容易从文献中获得，并且已经成功地用于评估大跨度桥梁对风荷载的敏感性。在这两种情况下，颤振临界速度和抖振通常都是通过确定性分析来估计的。但是，由于固有地存在不确定性，尤其是与风和空气动力特性的定义相关的不确定性，因此该问题的概率性质是潜在的。这些量包括，例如，风速功率谱密度，静态系数和空气动力学导数，通常来自现场观测或实验分析。它们的影响常常被忽略，或者通常仅通过敏感性分析来解决。尽管过去研究人员已经对颤振估计的不确定性进行了分析（例如，通过可靠性分析），但很少有人关注抖振。在本文中，通过推导与具有选定随机参数的单模抖振问题相关的闭式解，分析了与风的随机性质和结构特征相关的影响。提供了一个具体示例来阐明风能频谱密度，阻尼和选定的气动弹性导数的作用。 （C）2007 Elsevier Ltd.保留所有权利。

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