Abstract
The object of this paper is to examine the limits of application of usual rigid frame analysis to the strength of deep girder structures, which were not clarified in the previous series of papers. For this purpose, a typical deep girder of super mammoth tanker and a transverse ring of 122,000D/W tanker are analysed as a plain stress problem, using the finite element method. Results are in substantial agreement with those of beam theory, except in way of the joint between bottom transverse and longitudinal bulkhead vertical web. Accordingly, a modified rigid frame analysis combined with finite element method is proposed, and the utility of this method is established by the analysis of the same structures.
