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Publications
Gordo, J. M. (2017), “Compressive strength of double-bottom under alternate hold loading condition”, Progress in the Analysis and Design of Marine Structures, Guedes Soares, C. & Garbatov Y. (Eds.), Taylor & Francis Group, London, UK, pp. 253-261
The alternate bending of the bottom’ structure of a ship as a result of the action of external pressure due to the sea and the internal loading in alternate holds, causes a bending of secondary order between the transversal bulkheads which overlaps the primary bending of the hull girder of the ship. It can be an important source of ultimate strength reduction when the vessel is in hogging. In this hogging condition, the double bottom is under compressive stresses and may collapse by elastic-plastic instability. The second-order bending due to loading on alternate holds, substantially increases the compressive stress in the bottom panels of unloaded holds and on double-bottom panels subjected to internal loading, usually leading to premature collapse, and consequently, a drastic reduction of the contribution of bottom and double bottom for the resistance to longitudinal bending of the ship. In this study, it is analysed and quantified the reduction of compressive strength of the double bottom of a bulk carrier through the finite element method. It is also introduced a method that account for the effect of such reduction on strength in estimated ultimate longitudinal strength of the ship under hogging conditions, by quantifying the negative impact on it.
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