Superstructure of a RO-RO ship plays an important role to allocate things inside the ship, for instance passengers, cars, goods and so on. Superstructure consists of transversal and longitudinal deck beam to support the structure. It is well known that the superstructure has significant contribution to the longitudinal strength. The investigation of the superstructure of a RO-RO ship particularly its influence to longitudinal strength is very limited. In addition, this influence is not clearly explained in the regulation for the structural strength under longitudinal bending. In conjunction with this, the influence of superstructure is therefore must be considered. To investigate the influence of superstructure on the longitudinal strength of RO-RO ship, the Smith???s method implemented into Beam-HULLST is applied and the formulation in Beam-HULLST is based on the thin-walled beam theory. As a simple calculation, the cross section of RO-RO ship is taken to be analyzed. The results obtained by Beam-HULLST with and without the superstructure are compared with one another for the investigation of the cross section???s progressive collapse behavior.
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