Abstract Reliability based design optimization (RBDO) for deck shape and thicknesses of the steel plates that form a box girder of long-span suspension bridges is performed considering probabilistic flutter constraint. The entire process was carried out fully computationally including the definition of flutter derivatives. Surrogate models were constructed to estimate the aerodynamic response of the bridge for different deck shapes based on the results from a series of CFD simulations. Some of the aerodynamic coefficients were validated by wind tunnel tests. Flutter derivatives were then estimated using quasi-steady approach for the evaluation of critical flutter velocity. Uncertainty in the aerodynamic coefficients from CFD simulations as well as the extreme wind speed at the bridge site were considered. The formulated methodology was applied to the Great Belt East Bridge.

中文翻译：

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考虑气弹约束的大跨度悬索桥梁型及板厚可靠性设计优化

摘要 考虑概率颤振约束，对构成大跨度悬索桥箱梁的钢板的桥面形状和厚度进行了基于可靠性的设计优化（RBDO）。整个过程完全通过计算进行，包括颤振导数的定义。根据一系列 CFD 模拟的结果，构建了替代模型来估计桥梁在不同桥面形状下的空气动力学响应。一些空气动力系数通过风洞试验进行了验证。然后使用准稳态方法估计颤振导数以评估临界颤振速度。考虑了来自 CFD 模拟的空气动力学系数的不确定性以及桥梁现场的极端风速。