Abstract
The present paper includes structural analysis and assessment of a set composed of 6 cages. The set floating on a wavy sea surface is subject to pressure and inertial forces. The preliminary analysis neglects, however, the dynamic effects assuming that the set of 6 cages is self-balanced. Such assumption is possible due to the fact that the natural period of cage heave and pitch is several times less than sea wave period. The analysis has been made for the cage set on calm water and for steep sinusoidal wave coming from various directions. Finite element method version applied in computer program MSC Nastran 70.7 was used for the analysis. For computation of 6-cage set special rod-type elements have been used in order to account for nonlinear relationship of local buoyancy versus tube immersion, fully emerged (or submerged) cross-section area, and for effect of structure deformability to the buoyancy forces. Global-local technique has been used for computation of local strength. Beam model of 6-cage set has been assumed as the global model, whereas cage corner andor single cage are represented by local shell model.
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