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Global strength analysis of very large floating structure single module in typical wave loading cases

LI Liangbi;DONG Jiahuan;LUO Guang'en;GU Haiying;YANG Peng;School of Navel Architecture & Ocean Engineering,Jiangsu University of Science and Technology;China Ship Building Industry Corporation 702 Institute;  
Very large floating structures( VLFS) are made of several same single modules,and the analysis of the strength of single module is the basis of the strength analysis of VLFS. So the calculation of single module of VLFS in typical wave loading cases is necessary. In this paper,firstly,according to the DNV specification and the transverse pontoon of feature of the VLFS,four typical loading cases—longitudinal split case,longitudinal torsion case,horizontal shear case,and vertical bend case—are selected. Then,a long term prediction of wave loads is studied with the finite element software SESAM. Finally,the global strength of the single module of the VLFS in four typical loading cases are calculated based on the direct calculating method. The results show that the stress distribution of the total structure is uniform,and there are three areas of high stress—the joint of the columns and the upper box,the joint of the column and the pontoon,and the size change area of the brace. Our research provide a theoretical foundation for the design of the VLFS.
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