When designing the large tanker, the designer must chose the most effective structural system according to its principal particulars and the tank arrangement among several structural systems which may be considered. In this report, the authors try to analyze the structural strength

It is well known that the racking phenomenon is the most important structural design problem for a ship having few transverse bulkhead. This paper reviews the results of study on the method of calculation of the racking deformation in the cross section of such a ship. First, the authors explain the method of estimation of deviation loads responsible for the racking. The authors define the deviation loads as differences between the actual loads and beam loads. The beam loads are assumed to be acting, proportionately to the resultant shear forces, on the cross section of each longitudinal strength member as an elastic thin walled beam. Secondly, the authors examine the distribution of racking as the shearing deformations in cross sections of a Pure Car Carrier, which is capable of carrying 3000 motor cars, by somewhat simplified structural idealization.

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In the previous paper,' the authors explained a proposed method for calculating the racking deformation in the hull cross section of a ship having few transverse bulkheads. By way of example, the authors analyzed the distribution of racking as the shearing deformation in the hull cross section of a Pure Car Carrier designed capable of carrying 3,000 motor cars.In this paper, the authors review the results of theoretical calculation and full scale measurements which they carried out on the racking deformation in hull cross sections of a Roll-on/Roll-off ship built at Nagasaki Shipyard & Engine Works of Mitsubishi Heavy Industries in order to evaluate the accuracy of the prediction made by the proposed calculation method.The results of the theoretical calculation and actual measurements showed a fairly good agreement, and thus the proposed method of calculation was proved to be highly useful in accurately predicting the racking deformation in the hull cross section at the ship design stage.