規則波中における超大型浮体式構造物の構造応答解析法に関する研究(第1報) : 1段階解析法

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The detailed design of Very Large Floating Structures (VLFSs) necessitates the structural response analysis of the complicated hull structure with three-dimensional models. Some two-step algorithms have been proposed, composed of the first-step classical Ritz's approach based on the free free beam function expansions for the dynamic response analysis of the equivalent elastic rectangular plates and the second step finite element one for the detailed three dimensional structural analysis based on the first-step output. However, they are rather intuitive. Scarce attention has been paid to their rationalization. This paper deals with a one step approach for the structural response of VLFSs in waves, as an early stage of an alternative rational multi step approach. As an analysis tool, the general purpose computer program previously developed for three dimensional hydroelastic response of VLFSs in regular waves has been adopted, where NASTRAN for structural analyses is incorporated with the domain decomposition type hybrid finite/infinite element method for water wave analysis and the modal analysis for structure water wave interactions. Test calculations for a full three dimensional finite element structural model of a 1200m box like VLFS, composed of a deck, a bottom, side shells and bulkheads, have been conducted successfully and this has proved the applicability of the program to the structural response analysis. Comparative study for an orthotropic plate model and a sandwich grillage model has been conducted. Then, the sandwich grillage model, when appropriately adjusted, has shown to give a good approximation to the corresponding three dimensional model. The results of these one-step analyses are also useful to validate the two step ones.

規則波中における超大型浮体式構造物の構造応答解析法に関する研究(第1報) : 1段階解析法

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