分布荷重を受ける球平型鋼付き防撓パネルの曲げ崩壊強度に関する研究

概要

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Bulb flats are widely used for the stiffeners on the side wall of individual tanks in ships, because of their easiness of coating and maintenance. However, characteristics of the strength of the bulb flat are not well known. In particular, the buckling/plastic collapse behaviour accompanied by the lateral-torsional buckling must be more investigated, since the horizontal bending stiffness of the bulb flat is smaller than that of the angle bar or tee bar. In the present study, three-point bending tests are performed for the stiffened plates with a bulb-flat stiffener or a flat-bar stiffener, and the effect of the cross-sectional shape of the bulb flat on the ultimate strength of the stiffened plate in bending is examined. Then, a series of elastoplastic large deflection FEM analyses is performed for the stiffened plate with a bulb-flat stiffener subjected to distributed lateral loads. The tank walls taken from the actual ships are analysed. Based on the results, a simplified formula to estimate the bending collapse strength is proposed.
社団法人日本船舶海洋工学会の論文
2000-03-29