Dynamic response analysis of a floating offshore structure subjected to the hydrodynamic pressures induced from seaquakes
Dynamic response analysis of a floating offshore structure subjected to the hydrodynamic pressures induced from seaquakes
复制标题
DOI：
10.1016/j.oceaneng.2015.04.010
复制
发表时间：
2015-06
影响因子：
5
通讯作者：
Jin Ho Lee;Jae kwan Kim
中科院分区：
文献类型：
--
作者：
Jin Ho Lee;Jae kwan Kim
本文提出了一种海洋浮式结构物在地震动水压力作用下的抗震分析方法。考虑流体-结构相互作用、海底能量吸收和能量辐射到无穷远，采用可压缩无粘性理想流体模型，计算了海水对结构的动水压力。从流体动压力，附加质量和有效载荷，由流体动压力，得到。它们与结构的有限元模型相结合，从而形成整个耦合系统的数值模型。为了验证数值模型的有效性，计算了自由场海底垂直运动引起的动水压力和浮动无质量刚性圆盘垂直振动引起的动水压力，并与精确解析解进行了比较。所开发的方法应用于地震分析的简化的支撑结构的浮式海上风力涡轮机受到的水动压力引起的地震。分析结果表明，海水的可压缩性和海床的能量吸收能力对浮式海洋结构物在海床竖向地震作用下的动力响应有很大影响。
A seismic analysis method for a floating offshore structure subjected to the hydrodynamic pressures induced from seaquakes is developed. The hydrodynamic pressure exerted on the structure by the ocean water, modeled as compressible non-viscous ideal fluid, is calculated taking into account the fluid–structure interaction, the energy absorption by the seabed, and the energy radiation into infinity. From the hydrodynamic pressure, the added mass and the effective load, resulting from the hydrodynamic pressure, are obtained. They are combined with the finite element model of the structure, resulting in a numerical model for the entire coupled system. For validation of the numerical model, the hydrodynamic pressures induced by the vertical motion of the seabed at free field, and due to the vertical vibration of a floating massless rigid disk, are calculated and compared with exact analytical solutions. The developed method is applied to seismic analysis of a simplified support structure for floating offshore wind turbines subjected to the hydrodynamic pressures induced from seaquakes. Analysis results show that dynamic response of a floating offshore structure induced by the vertical seismic motion of the ocean bed can be greatly influenced by the compressibility of sea water and the energy absorption capacity of the seabed.