固定式平台吊机基座疲劳分析研究

Fatigue damage analysis of crane pedestal in fixed offshore platform

本文针对固定式平台吊机基座结构,计算吊机基座在起升载荷及风载荷作用下,以及不同的吊机吊臂水平旋转角度下的疲劳强度。总结一种基于风向概率分布,吊机基座疲劳分析的方法。在吊机起升载荷工况下采用S-N曲线法进行疲劳分析;在风载荷工况下根据风向概率分布图,采用S-N曲线法进行疲劳分析。然后对相同位置处的疲劳损伤值进行叠加,并与直接组合吊机起升载荷及风载荷下的疲劳损伤值结果进行对比。该分析方法可为其他在风载荷及循环载荷下的固定式平台局部结构疲劳强度分析提供参考。

The fatigue strength of fixed offshore platform crane pedestal with different crane boom horizontal rotating angles are calculated under working loads and wind loads.Based on wind direction probability,the fatigue strength analysis method of crane pedestal is concluded.The fatigue analysis is calculated based on S-N curve method in working loads condition.The fatigue analysis was calculated based on wind direction probability distribution map in wind loads condition.The fatigue damages are accumulated in the same position,and compared with the result of direct combination of the working loads and wind loads.This analysis method provides a reference for other local structure on fixed offshore platform under wind loads and cyclic loads.