Abstract In the complex Ocean environment, wind load is the most important factor that should be addressed in the design of jack-up platforms. Although many efforts have been made to analyze the dynamics of jack-up platforms considering wind load effect, literature review shows that very limited work has been done to address the calculation of the wind load coefficient of each individual key component in a platform. Moreover, the influence of different wind speeds and directions under different working conditions of the platforms is not discussed clearly. To this avail, this paper investigates the wind load effect on the key components in a 400 ft jack-up offshore platform under three design conditions through normative calculation, numerical simulation and wind tunnel test. The wind force and torque of each key component (such as the crane, pile leg, and main hull) were obtained to calculate its wind load coefficient. The change rule of the wind load coefficient with different wind speeds and directions was discussed. The calculation results of the numerical simulation agreed well with these of the wind tunnel test, while the normative calculation results did not. The findings of this study may provide a basis for optimal design of jack-up offshore platforms.

中文翻译：

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自升式海上平台关键部件风荷载效应分析

摘要 在复杂的海洋环境中，风荷载是自升式平台设计中最重要的考虑因素。尽管在考虑风荷载效应的情况下分析自升式平台的动力学方面做出了很多努力，但文献综述表明，在计算平台中每个关键部件的风荷载系数方面所做的工作非常有限。此外，平台不同工作条件下不同风速和风向的影响也没有明确讨论。为此，本文通过规范计算、数值模拟和风洞试验，研究了3种设计工况下400英尺自升式海上平台关键部件的风荷载效应。各关键部件（如起重机、桩腿和主船体）计算其风荷载系数。讨论了风荷载系数随不同风速和风向的变化规律。数值模拟的计算结果与风洞试验的计算结果吻合较好，而规范的计算结果则不一致。本研究结果可为自升式海上平台的优化设计提供依据。