综合考虑海洋环境载荷及气动载荷，探讨了半潜型浮式基础结构设计及整体强度分析方法。针对一座安装在120m水深海域的5MW海上风机，参考海洋结构设计的有关规范，设计了由三立柱、斜撑、水平撑等构件组成的浮式基础。应用SESAM软件，建立了风电浮式基础整体有限元模型；根据莫里森公式和势流理论分别计算构件及立柱的水动力载荷，并运用叶素理论计算风机叶片的空气动力载荷；综合施加水动力载荷及叶片气动载荷，计算浮式基础结构的应力分布和变形分布。根据ABS规范，综合考虑构件压应力和弯曲应力，校核了构件的压-弯强度。计算分析结果表明，连接塔柱与立柱斜撑的两端部位应力较大，属于结构的危险部位。%Structure design and strength analysis method for semi-submersible floating foundation is investigated, with ocean environment loads and air dynamics force considered. Taking a 5MW wind turbine working in 120 meters deep sea area as an example, and referring the specification related to ocean engineering, a floating foundation composed by three columns, bracing and horizontal brace is designed. By the software SESAM, a global finite element model of floating foundation is established. Hydrodynamics loads on members and columns are calculated respectively based on Morison formula and potential fluid theory;air dynamics loads on turbine are solved by blade element theory under different wind coming speed;distributions of stress and strain are calculated with considering application of hydrodynamic load and aerodynamic loads. Based on the ABS code, global strength of the foundation is checked, and compound stress is calculated by considering compressive stress and bending stress, then pressure bending strength and stability of members is checked. It is shown that the maximum stress is at two ends of the brace linking the tower columns, and dangerous structure area is at the joint between connection column and brace.
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