半潜式平台关键结构全寿期极限强度预报方法研究

文章基于逐步破坏分析法和有限元计算方法，发展了一种计及材料腐蚀、疲劳裂纹等结构损伤的半潜式海洋平台关键结构全寿期极限强度计算方法。以一服役水深为3000 m半潜式平台为研究对象，选取横撑和立柱局部结构作为研究对象，以不同服役年限下裂纹扩展长度和腐蚀厚度作为变化参数，采用ANSYS软件建立其参数化有限元模型，计算了不同服役年限下半潜式海洋平台关键结构极限强度，在此基础上分析了全寿期内关键结构极限强度随服役年限的变化规律。

A prediction method of the ultimate strength of key components of semi-submersible platforms in total life cycle

Based on the progressive collapse analysis method and finite element method, a calculation method of the ultimate strength of Key Component and Key Joints of semi-submersible platform in total life-cycle was developed, which considered the structural damage such as material corrosion and fatigue cracks. Selecting the cross brace and stand column of 3 000 m semi-submersible platform as a computational model, com-bining ANSYS software to establish a parametric finite element model by taking corrosion thickness, crack size as the variational parameters, the ultimate bearing capacity of key structure of semi-submersible plat-form in different service lives was calculated. On this base, the injury factors in total life cycle such as cor-rosion and fatigue cracks, and so on were considered, and the ultimate bearing capacity of key structure changing with platform age in total life cycle was given.