半潜式起重拆解平台重型吊机基座疲劳损伤分析

本文对半潜式起重拆解平台上的吊机基座在工作载荷和波浪载荷下的组合疲劳损伤进行了分析研究。首先,建立了吊机基座与主船体连接结构的有限元模型,对疲劳热点区域进行了局部细化,并根据API规范的推荐做法计算吊机基座在工作载荷下的疲劳损伤;然后,结合不同作业工况和工作海域的影响,采用谱分析方法计算吊机基座在波浪载荷下的疲劳损伤;最后,对基座总疲劳损伤进行了组合分析。研究结果表明,多数热点部位的疲劳损伤都是以吊机工作载荷疲劳为主;局部热点由于船体结构布置的原因,波浪疲劳占比更大。吊机基座在设计时应综合考虑工作载荷疲劳损伤和波浪疲劳损伤两因素,才能保证基座在平台运营期间内的疲劳寿命。

Fatigue Damage Analysis for Heavy Crane Foundation of Semi-Submersible Lifting and Disassembling Unit

This article process analysis and research to combine fatigue damage of the crane foundation on semi-submersible lifting and disassembling unit under working load and random wave load.At first,the finite element model of the connecting structure between the crane foundation and the main hull structures is established,and then the hot spots of fatigue are local refined.Secondly,fatigue damage of crane pedestal foundation under working load is calculated according to the recommended practices of API rule.Then,fatigue damage of crane foundation under wave load is calculated by spectral analysis method by considering the influence of different working conditions and working sea area.Finally,the total fatigue damage of crane foundation is analyzed by using the method of combinatorial analysis.The results indicate that the fatigue damage of most hot spots is mainly caused by the crane working load,and the wave-induced fatigue is more important in some local hot spots due to the arrangement of the ship structure.It shows that the fatigue damage of crane working load and wave-induced fatigue damage should be considered comprehensively in the design to ensure the fatigue life of the crane foundation during the operation of the unit.