基于离散元-有限元模型的冰激锥体海洋平台结构振动分析

摘要

Ice force is an important factor which affects the operating safety of jacket platform structure and its equipment.According to the dynamic interaction process between sea ice and offshore structure, the discrete element method (DEM)is employed to analyze the breaking process of sea ice,and the finite element method (FEM)is used to simulate the dynamic response of jacket platform.Considering the in-teraction between sea ice and jacket platform,the DEM-FEM numerical method is proposed to analyze the ice-induced vibration of jacket platform and the dynamic ice loads.%冰荷载是影响海洋平台结构及其上部设备作业安全的重要因素。针对海洋平台与海冰相互作用的动力过程，采用具有粘接-破碎性能的离散元方法(DEM)对海冰的破碎特性进行分析，采用有限元方法(FEM)对海洋平台结构的动力响应进行计算；同时考虑海冰与海洋平台结构的耦合作用，将海冰的离散元方法与海洋平台结构的有限元方法相结合，建立了冰激海洋平台结构振动的 DEM-FEM 模型，并由此计算海冰作用下海洋平台结构的振动响应以及冰荷载特性。