On the Transverse Strength of Oil Tankers

Abstract

In order to examine exactly the strength of transverse rings of oil tanker with long cargo tanks, it is necessary to take into consideration the effects of deformation of the longitudinal members which support the transverse members. Much investigation has been done in regard to this problem as the shearing deformation of wing tank. It seems to us that the shearing deformation will occure not only in wing tank but also in centre tank. The authors try to make the three dimensional strength calculation for all tank parts and then try to analize the results of experiment on an actual ship and to make some considerations upon the longitudinal members.From this study following things are found : (1) The deformations and the stresses in the transverse ring of a big tanker can be estimated with good accuracy for the practical uses by this method.(2) The shearing deformations in the cross section increase the stresses in the lower part of the transverse ring.(3) In way of the tank parts, the shearing force seems to be more shared by the longitudinal bulkhead and to be less shared by the side shell than what is usually considered.