二重殼船体の船底彎曲部の連結構造と強度について

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Recently, container ship, log or timber carriers and so on have double hull in their side structures, because they have long and wide hatch openings. There are various kinds of connecting structures of the double hull structure and the double bottom in the bilge part from the viewpoint of the strength, construction and loading considerations. In this report the theoretical and experimental researches carried out by the authors is presented. The experimental researches have been made for the three models, that is, A-, B-, and C-type as shown in Fig. 2.4 having the different connecting structure of the double hull with the double bottom of the bilge part, which is usually used. The difference of connecting structure is in the difference of curvature of inner shell in the bilge part and the effectiveness on the structural strength of the inserted plate which the inner shell enters into the bilge and extends to the outer shell. The summarized results of the innvesitgations are as follows. (1) In all of three models the shear lag stresses were clearly observed on the inner shell and outer shell near the bilge part, and were gradually decreased along the owtward members from the bilge part. (2) The most severe stress concentration in the bilge part of the inner shell has occured in the A-type model compared with B- and C-types. (3) The maximum stress of the bilge part in the inner shell of A-type was about two or five times than that of B-type, and that of C-type was about one point three times than that of B-type. (4) In the comparision of the bilge part having and not having the inserted plates, the effect of the inserted plates on the strength of shell structure has been clearly observed in the A-type but not in the other types. (5) The decrease of the effective breadth of the inner or outer curved shell in the bilge was ten or forty percent of frame space, that was theoretically and experimentally observed. (6) The inserted plates have no effects on the effective breadth of the inner and outer shells in the bilge parts, but they have significant effects on it in the outside of the bilge. (7) The theoretically analysed stresses in the bilge parts as shell structures have resulted in a good agreement to the observed values on all of the models.
社団法人日本船舶海洋工学会の論文
1971-07-31

二重殼船体の船底彎曲部の連結構造と強度について

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