风暴条件下自升式平台桩腿强度对节距敏感性分析研究

文章以自升式平台桁架式桩腿优化设计技术研究为目标,完成风暴条件下桩腿强度对节距敏感性分析。通过风洞试验技术获取风载荷数据;基于STOKES五阶波理论和MORISON方程,采用DNV开发的SESAM软件WAJAC模块分析获取波流载荷数据;通过特征值分析得到平台自振周期和一阶偏移值,进而获取计及DAF效应的惯性载荷和P-△效应的二次惯性矩。基于上述载荷计算结果,重点对不同节距的桩腿结构进行强度校核,给出目标平台桩腿节距优选值,形成桩腿强度对节距敏感性分析技术,为平台核心部件的自主设计提供技术参考。

On sensibility of self-elevating unit leg strength to different bay heights under storm environment condition

The unit environmental bearing capacity can be effectively enhanced by the structure optimization of these legs. This paper analyzes the sensibility of leg strength to the different bay heights under the storm condition for the optimization design of the truss legs on the self-elevating unit. The wind loads data is obtained from the wind tunnel test and the wave and current loads are obtained by WAJAC module in SESM, which is developed by DNV, based on STOKES 5 orders wave theory and Morison equation. The natural vibration period of the unit and the first order offset value are obtained through the eigenvalue analysis, following the inertial load considering the DAF effect and the inertial moment considering theP-△effect. This paper focuses on the strength check of the leg structures with the different bay heights based on the load results described above, resulting in the optimal bay height for the targeted unit. It proposes the sensitivity analysis technique of the bay heights, which can provide references for the independent design for key parts of the self-elevating unit.