船体ビルジ部の座屈・最終強度と縦曲げ最終強度に対する寄与に関する研究

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There are several methods to estimate the ultimate strength of hull girder, among which the method developed by Smith is widely used as a simple and practical method. In this method, the round corners such as a bilge shell part are usually considered as hard corner elements which do not undergo buckling. A series of elastoplastic large deflection analyses were performed to investigate buckling/plastic collapse behaviour of the bilge circle part subjected to uni-axial thrust. Based on the calculated results, simple formulas were derived to simulate buckling/plastic collapse behaviour of the bilge shell. The ultimate strength analyses of hull girder by Smith's method were carried out taking the buckling/plastic collapse behaviour of the bilge shell into account. Through these studies, it has been found that: (1) A bilge structure with a conventional shape and size reaches the ultimate strength by yielding before buckling takes place. After the ultimate strength has been attained, plastic buckling takes place and the capacity decreases with the increase in deflection. (2) The buckling/ultimate strength of the bilge circle part is dominated by design parameters such as radius/thickness ratio, yield stress and length/radius ratio of the bilge circle part. (3) Hard corner elements could be used for bilge circle part to calculate the ultimate hull girder strength applying the Smith's method. (4) However, the influence of buckling of the bilge circle part has to be taken into account for the accurate estimation of the load carrying capacity beyond the ultimate strength when the Smith's method is applied.
社団法人日本船舶海洋工学会の論文

船体ビルジ部の座屈・最終強度と縦曲げ最終強度に対する寄与に関する研究

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