目前在大多数应用浮式防波堤对桥梁结构进行防护的研究中，系泊浮式防波堤在极端波浪下对沿海桥梁的防护研究还很有限。基于开源计算流体动力学（computational fluid dynamics, CFD）软件OpenFOAM中的waves2foam工具和开源系泊工具MoorDyn耦合，以孤立波为极端工况，建立孤立波作用下浮式防波堤与箱梁的水动力模型，研究了浮式防波堤淹没系数、浮式防波堤长度及系泊拖地长度对箱梁防护特性的影响，并对流场和箱梁特征点的压力进行分析，揭示箱梁受力特性发生改变的原因。结果表明，所采用的耦合方法具有较高的精度和可靠性，浮式防波堤对减小水平荷载贡献大，对减小竖向荷载贡献较小，需增强箱梁的竖向抗冲击约束，浮托力对特征点的压力峰值有较大影响，适当增大防波堤淹没系数对箱梁的综合防护效果较好。

At present, in most of the studies on the application of floating breakwaters to the protection of bridge structures, the study of mooring floating breakwaters to the protection of coastal Bridges under extreme waves is still limited. Based on the coupling of the waves2foam tool in the open-source computational fluid dynamics(CFD) software OpenFOAM and the open-source MoorDyn mooring tool, the hydrodynamic model of the floating breakwater and box girder under the action of isolated waves was established under extreme conditions. The effects of submerged coefficient of floating breakwater, length of floating breakwater and length of mooring mop on the protective characteristics of box girder were studied, and the pressure of flow field and characteristic points of box girder were analyzed to reveal the reason for the change of force characteristics of box girder. The results show that the coupling method used has high accuracy and reliability. Floating breakwaters have a significant contribution to reducing horizontal loads and a small contribution to reducing vertical loads. It is necessary to enhance the vertical impact resistance constraint of the box girder. The buoyancy force has a significant impact on the peak pressure of characteristic points. Increasing the submergence coefficient of the breakwater appropriately has a better comprehensive protection effect on the box girder.