Research on fatigue strength analysis method for large scale special-shaped hollow floating structure
The marine environment is complex and changeable,and offshore structures need to bear the alternating load caused by random waves for a long time,which is very easy to cause fatigue damage.In this paper,a large-scale special-shaped hollow floating structure is taken as the research object,and the location where the structure is prone to fatigue fail-ure is found through calculation and analysis.In order to make the results of structural fatigue spectrum analysis more accur-ate,a numerical regular wave simulation method is proposed to calculate the transfer function of structural stress.On this basis,the fatigue life of the floating structure is calculated by using the spectrum analysis method based on hot spot stress and nominal stress respectively.The results show that the fatigue life of the structure based on hot spot stress method is slightly lower than that based on nominal stress method.The above research results can provide reference for the design of large offshore floating structures.
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