鉱石運搬船の横強度 : 第1報貨物倉の鉱石ペレットの挙動について

概要

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Recently, several papers have been presented with respect to the behavior of iron ore pellets in cargo holds of ore carriers. However, the property of the behavior of ore pellets is so complicated that studies from various points of view are still thought to be necessary and effective to, establish a practical procedure to compute the ore pressure in cargo holds. In this paper, the behavior of the ore pellets in a hold is experimentally studied by means of two large scaled models of hulls and holds of two different ore carriers. As for the essential property of the stress-strain relations of ore pellets, a series of triaxial compression tests are carried out. A rather simple equation to calculate the ore pressure distribution in a hold after loading is derived using the earth pressure coefficient at rest which is determined according to the results of the triaxial compression tests. A set of nonlinear elastic springs whose characteristics are determined by the triaxial compression tests are introduced as a substitute for the ore pellets to calculate the interaction between the hull and the pellets. They are applied to calculate the increase of the ore pressure induced by wave loads on the side shells, where the hull is replaced by a frame structure.
社団法人日本船舶海洋工学会の論文