Abstract
In this paper a simplified analysis is proposed for the selection of structural systems of a car carrier, whose transverse structural system has wise variations such as a partial bulkhead system and a strong web frame system depending on the relevant design philosophies. Introducing a simple beam model, which can be solved by a symbolic manipulation procedure, one can observe that the racking deformation of the transverse section is mainly influenced by the non-dimensional shearing rigidity defined in the present analysis. Comparing the partial bulkhead and strong web frame systems, the shearing rigidities at the bulkhead sections having the latter system is considerably small, and correspondingly is racking deformation obtained by the simplified analysis is several times larger than that of the former system. In order to predict the racking deformation of actual ships having various transverse rigidities, an effective method is proposed, where the simple beam analysis using symbolic calculations is combined with the numerical data obtained by precise three-dimensional structural analyses of ships having similar principal dimensions. The validity of the proposed method is confirmed by comparing the predicted values with the precise numerical results.
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