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Fatigue Strength Analysis of BINGO9000 Semisubmersible Drilling Rig

LIU Gang1, ZHENG Yun-long1, ZHAO De-you1, LIANG Yuan-hua1, GUAN Wei-shu2, MA Yan-de2(1 School of Naval Architecture,Dalian University of Technology,Dalian 116023,China; 2 Dalian New Shipbuilding Industry Limited Liability Company,Dalian 116021,China)  
Fatigue strength of BINGO9000 semisubmersible drilling rig is analyzed in this paper.First,3D finite element model of the rig is formed.According to wave long-term distribution of North Sea,stresses of the whole structure subjected to 72 wave loads cases are calculated,which supplies boundary conditions of local tubular joint models in local stress analysis.Then,for fatigue strength analysis,local finite element models of the tubular joints are also formed.Hot spot stress method is used in the calculation of stress range.With S-N curve selected from DNV rules of fatigue strength analysis for mobile offshore units,the Miner linear fatigue damage accumulation rule is used to calculate fatigue life of the tubular joints.Finally,some useful conclusions are drawn,which will give valuable technical support for future design and building of the semisubmersible drilling rig in China.
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