ON THE GLOBAL STRENGTH ANALYSIS OF PRELIMINARY DESIGN FOR SEVERAL FLOATING DOCK TYPES
Abstract
The design concepts of floating docks used for shipyards launching activities have to be assessed from the preliminary design phases by global strength criteria. At initial design, few technical data of floating docks are available, so that the global strength analysis can be developed only on simplified numerical models by the hull equivalent beam method. As loading conditions several docking cases and equivalent design waves, head and oblique conditions, are considered, according to the floating dock design rules. The computations are done with own codes, involving non-linear iterative procedures, which require as input data the 3D-CAD floating docks offset lines and on-board mass distributions. For studying floating dock models, the authors have considered three constructive versions: small dock with continuous and non-continuous side ballast tanks, large dock resulting from a conversion of an off-shore barge. The global strength criteria are the admissible sectional efforts by design rules of statistical values and the ultimate strength vertical bending moment by Smith method. The free board operation criterion is also considered for safety evaluation. The preliminary operation limits of the analyzed floating docks are obtained, in terms of equivalent design wave height, pointing out the main differences between the three constructive versions included in this study.
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