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Recent developments on bridge flutter stability estimation accounting for errors in the aeroelastic loading

机译：考虑空气弹性载荷误差的桥梁颤振稳定性评估的最新进展。

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State-space stochastic modeling (Ito-type) is employed in this study to numerically investigate the relevance of modeling errors in the aeroelastic loading on the flutter stability of a long-span bridge. The main features of the numerical model are: (i) linear time-domain representation of aeroelastic load based on indicial-function formulation, perturbed by a suitable "parametric error"; (ii) turbulence-induced buffeting load still retained in the dynamic equations; (iii) linear bridge response restricted to fundamental bending and torsional mode of the moving deck and cables. The flutter velocity is determined by using the definition of second- and third-moment stability of the random dynamic vector. A simplified bridge model is employed to investigate the feasibility of the proposed approach. Two numerical algorithms for the solution of stochastic stability are implemented. The comparison of the results is based on statistical properties of the random state vector at incipient flutter (initial time), which includes the "parametric error" variable.
机译：本研究采用状态空间随机建模（Ito型）来数值研究气动弹性载荷中建模误差与大跨度桥梁颤振稳定性的相关性。数值模型的主要特征是：（i）基于独立函数公式的气动弹性载荷的线性时域表示，受到适当的“参数误差”的扰动； （ii）湍流引起的抖振载荷仍然保留在动力学方程中； （iii）线性桥梁的响应仅限于活动甲板和电缆的基本弯曲和扭转模式。颤动速度是通过使用随机动态矢量的第二和第三矩稳定性的定义确定的。采用简化的桥梁模型来研究该方法的可行性。实现了两种求解随机稳定性的数值算法。结果的比较基于初始颤动（初始时间）时随机状态向量的统计属性，其中包括“参数误差”变量。

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