Abstract In recent years, a number of researchers have applied various computational methods to study the wave and tsunami forcing on bridge superstructure problems. Usually, these computational analyses have relied upon application of computational fluid dynamic (CFD) codes. While CFD models provide accurate results, their disadvantage is that they tend to be computationally expensive. Thus, it may be difficult to apply these techniques during risk assessment analyses. During this study, an alternative computational method was explored in which a previously-developed diffraction model was combined with a previously-developed trapped air model under worst-case wave loading conditions (i.e., when the water surface was at the same elevation as the bottom bridge chord elevation). The governing equations were solved using a finite difference algorithm for the case where the bridge was attacked by a single wave in two dimensions. Resultant water forces were computed using results from the diffraction/trapped air computations, and water force values were compared with data from three datasets. In general, excellent agreement between the diffraction/trapped air model and data was observed. The computational time associated with the model was only approximately one hour per bridge configuration, which would appear to be an improvement when compared with other computational techniques.

中文翻译：

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用于预测水波攻击下桥梁波浪载荷的单向耦合绕射/滞留空气模型的开发

摘要 近年来，许多研究人员应用各种计算方法来研究波浪和海啸对桥梁上部结构的强迫问题。通常，这些计算分析依赖于计算流体动力学 (CFD) 代码的应用。虽然 CFD 模型提供了准确的结果，但它们的缺点是计算成本往往很高。因此，在风险评估分析期间可能难以应用这些技术。在这项研究中，探索了另一种计算方法，其中在最坏的波浪载荷条件下（即，当水面与底部处于同一高度时），将先前开发的衍射模型与先前开发的滞留空气模型相结合。桥弦高程）。对于桥梁受到二维单波攻击的情况，使用有限差分算法求解控制方程。使用衍射/捕获空气计算的结果计算合成水力，并将水力值与来自三个数据集的数据进行比较。总的来说，观察到衍射/捕获空气模型和数据之间的极好一致性。与模型相关的计算时间仅为每个桥梁配置大约一小时，与其他计算技术相比，这似乎是一个改进。总的来说，观察到衍射/捕获空气模型和数据之间的极好一致性。与模型相关的计算时间仅为每个桥梁配置大约一小时，与其他计算技术相比，这似乎是一个改进。总的来说，观察到衍射/捕获空气模型和数据之间的极好一致性。与模型相关的计算时间仅为每个桥梁配置大约一小时，与其他计算技术相比，这似乎是一个改进。