Jack-up platforms are commonly found in the costal or offshore environment for offshore oil and gas recovering. Pile legs are the main component of jack-up platform, which support the whole platform and suffer from the ocean environment load. Topology optimization method is proposed in this article to find an optimized shape for the leg by maximizing its structural stiffness, with the purpose of providing enough resistance for extreme environment load. The whole design space is chosen as design variables, and the maximum stiffness is selected as the optimum objective, with the volume and displacement constrained. An innovative leg structure is generated with lighter weight. Finally, the static and transient dynamic characteristics of the optimized structure leg are analyzed, compared with the original one. It is found that the optimization results not only produce better material distribution with less mass, but also enhance the stiffness and strength requirements of leg structure under the extreme environment load.

中文翻译：

---

自升式海上平台支腿结构拓扑优化

自升式平台常见于沿海或近海环境中，用于海上油气回收。桩腿是自升式平台的主要组成部分，支撑整个平台，承受海洋环境载荷。本文提出了拓扑优化方法，通过最大化其结构刚度来为腿找到优化的形状，目的是为极端环境载荷提供足够的抵抗力。选取整个设计空间作为设计变量，选取最大刚度作为最优目标，同时约束体积和位移。创新的腿部结构以更轻的重量产生。最后，对优化后的结构腿的静态和瞬态动力特性进行了分析，并与原腿进行了比较。