油槽船縦隔壁の応力分布について

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Generally, a large tanker has two or three longitudinal bulkheads running through almost all the length of hull. And it is well known that these bulkheads are almost fully effective as web members of hull girder with respect to the longitudinal strength in the middle part of the length. However, the experimental results on actual tankers obtained by Dr. Kinoshita and Dr. Nishimaki show that the patterns of the stress distribution in the vicinity of the fore and aft ends of the bulkhead are far differ from those calculated by the beam theory. This should be due to the shear-lag effect at the end part of the plate. In this paper, the theoretical studies with regards to the stress distribution of the longitudinal bulkhead with various end conditions are described. The theory used in this paper was established by referring to Prof. Yamakoshi's theory on the stress distribution of ship's superstructure. The main results obtained are as follows ; (1) The shear-lag phenomenon in the longitudinal bulkhead is independent of it's thickness and length. (2) The shear-lag effect is remarkable only within the range approximately equal to 1.2 times the depth of the longitudinal bulkhead from it's end. The remaining middle portion is fully effective on the longitudinal bending of hull structure and the distribution of the bending stresses in the longitudinal bulkhead in this region can be obtained by using the beam theory. (3) The effect of the end bracket is remarkable, but the effect of the transverse bulkhead of usual flexible rigidity is negligibly small.
社団法人日本船舶海洋工学会の論文
1964-02-29

油槽船縦隔壁の応力分布について

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