半潜式平台总体强度计算和关键结构极限强度计算方法研究

Study on Global Strength Calculation Method and Ultimate Strength Calculation Method of Key Structure of Semi-submersible Platforms

给出了基于ANSYS/AQWA软件的半潜式平台整体强度分析方法,采用逐步破坏分析法和有限元计算方法,计算半潜式海洋平台关键节点和关键构件极限强度。以一典型深水半潜式平台为对象,进行了自存工况和作业工况下8个典型危险波浪载荷条件下的平台整体强度有限元分析,选取应力最大的横撑和立柱局部结构作为计算模型,确定合理的边界条件,通过计算给出了半潜式平台关键节点和关键构件的极限承载力,为下一步平台结构的安全性评价提供可靠依据。

Based on ANSYS/AQWA software, a calculation method of the global strength of semi-submersible platforms was developed, adopting the progressive collapse anal- ysis method and finite element method to calculation the ultimate strength of key component and key joints of semi-submersible platforms. The typical semi-submersible platform was taken as calculation instance to calculate the global strength. The load cases for the calculation included drilling and survival, which contains 8 typical dangerous waves loads. The cross brace and stand column were selected as computational models to study their ultimate capacities, where stresses are maximum. The ultimate bearing capacities of key structures were given in this paper by determining the reasonable boundary conditions. Some conclusions were provided for reliable basis for the safety evaluation of the semi-submersible platform.