Recently there have been many proposals for unconventional arrangements of hatch openings in cargo vessel decks involving either hatches of unusual width or two or more lines of hatches. The problems concerned with bending in the vertical plane of such ship girders do not seem to offer special difficulty, but the effects of such unusual hatch configurations when the ship girder is twisted (as a ship may be by oblique seas or unsymmetrical loading) are not so well known. Tests reported by Bailey2 were an interesting experimental effort to shed light on these questions. The computation schemes described in this paper were used to predict the results on the six models used by Bailey2 independently by analysis alone. In general, the analytical predictions of both strength and stiffness agree well with the experimental results

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