In the previous paper, a study on the racking deformation of hull girder with many transverse rings or bulkheads was made using analytical solutions. In this paper, an advanced analytical method was derived for racking behaviour of hull girder with two decks and hull girder model was tested under tortional load. The test results were analysed by the above method and following conclution were obtained. 1) The test results show excellent support for the analysis of racking deformations of hull girder with many transverse rings, two decks and a bulkhead. 2) On the prevention of the racking deformation, effect of two decks and trnasverse rings are small respectively, but the effect of two decks is increased by interaction of the decks and rings.
