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首页> 外文期刊>Advances in Structural Engineering >An advanced pseudo excitation method and application in analyzing stochastic wind-induced response of slender bridge tower
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An advanced pseudo excitation method and application in analyzing stochastic wind-induced response of slender bridge tower

机译：先进的伪激励方法及其在细长桥塔随机风振响应分析中的应用

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摘要

Based on the theory of pseudo excitation method, a so-called stochastic pseudo excitation method is proposed to acquire the sampling results of stochastic dynamic response of uncertain bridge structure directly, which cannot be achieved by the classical pseudo excitation method. In order to reduce the computational cost of the dynamic finite element analysis of the samples to gain the probability density function of structural responses, the response surface method was adopted to handle the sampling results. The stochastic pseudo excitation method combing response surface method is verified by comparing with Monte Carlo method in good agreement. As an example, the stochastic response of a super-high slender bridge tower subjected to the Davenport fluctuating wind excitations is evaluated taking into account the uncertainties of material properties and wind speed. Numerical results show that the effect of uncertainties of structure or excitations plays a constant role in the stochastic response at the different levels of external excitations.
机译：基于伪激励方法理论，提出了一种所谓的随机伪激励方法来直接获取不确定桥梁结构随机动力响应的采样结果，这是经典伪激励方法无法实现的。为了减少样本动态有限元分析的计算量，以得到结构响应的概率密度函数，采用响应面法处理采样结果。通过与蒙特卡罗方法的比较，验证了随机伪激励法与响应面法相结合。例如，考虑了材料特性和风速的不确定性，评估了达文波特波动风激励下的超高细长桥塔的随机响应。数值结果表明，在不同的外部激励水平下，结构或激励不确定性的影响在随机响应中起着恒定作用。

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