Abstract A full time-domain two-dimensional (2-D) numerical model was established for the coupled dynamic analysis of submerged floating tunnel (SFT) structures. For hydrodynamic loads, a second-order time-domain potential flow numerical model was developed and a higher-order boundary element method (HOBEM) was applied to discretize the body boundary and the free surface boundary. The elastic rod theory was used to analyse the cable force to the SFT. Hinged boundary conditions were used at the junction of the mooring line and the structure. The viscous damping coefficient of the submerged cylinder was obtained through a decay physical model test, which was employed in the numerical simulation. In the coupled dynamic analysis, the motion equation for the hull and dynamic equations for the mooring lines were solved simultaneously using the Newmark-β method. The coupled analysis numerical model was applied in an SFT simulation with waves of different frequencies. The influences of viscous damping, buoyancy weight ratios (BWRs), and mooring stiffness distributions on the first- and second-order motion responses and tension of the mooring lines are analysed in detail, and some significant conclusions are presented.

中文翻译：

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张力腿式沉浮隧道波浪作用时域耦合动力分析

摘要 建立了全时域二维（2-D）数值模型，用于水下浮式隧道（SFT）结构的耦合动力分析。对于水动力载荷，建立了二阶时域势流数值模型，并应用高阶边界元法（HOBEM）离散体边界和自由表面边界。弹性杆理论用于分析对 SFT 的索力。在系泊线和结构的交界处使用铰接边界条件。通过衰减物理模型试验得到浸入式圆柱体的粘滞阻尼系数，并用于数值模拟。在耦合动力学分析中，船体的运动方程和系泊缆的动力方程使用 Newmark-β 方法同时求解。耦合分析数值模型应用于不同频率波的SFT模拟。详细分析了粘性阻尼、浮力重量比 (BWR) 和系泊刚度分布对系泊缆绳的一阶和二阶运动响应和张力的影响，并提出了一些重要结论。