This paper establishes a computationally efficient model to predict flood gate vibrations due to wave impacts including fluid–structure interaction. In contrast to earlier models, composite fluid domains are included to represent the situation of a flood gate in a dewatering sluice with the presence of an overhang that causes the confined-wave impacts. The dynamic response of the gate-fluid system is derived in the frequency domain using a substructuring mode matching technique, in which the gate vibrations are first expressed in terms of in-vacuo modes while the liquid motion is described as a superposition of linear potentials. Pressure impulse theory is employed to predict the impulsive wave impact loads, which are superposed on the quasi-steady wave loads. The computational efficiency of the developed model allows for a large number of simulations. This makes it possible for the first time to perform probabilistic evaluations for this type of problems without doing concessions on the accuracy of the physical modelling of the involved fluid–structure interaction processes. This is demonstrated by application of the developed models within a probabilistic framework resulting in the explicit quantification of the failure probability of flood gates subjected to wave impacts.

本文建立了一个计算效率高的模型来预测由于波浪冲击（包括流固耦合）引起的闸门振动。与早期模型相比，包含复合流体域来表示脱水闸门中存在导致受限波影响的悬垂物的情况。门流体系统的动态响应是使用子结构模式匹配技术在频域中导出的，其中门振动首先用真空模式表示，而液体运动被描述为线性势的叠加。利用压力脉冲理论预测叠加在准稳态波浪载荷上的冲击波冲击载荷。所开发模型的计算效率允许进行大量模拟。这使得首次对此类问题进行概率评估成为可能，而不会对所涉及的流固耦合过程的物理建模的准确性做出让步。这可以通过在概率框架内应用开发的模型来证明，从而明确量化受波浪冲击的防洪闸门的故障概率。