The Strength Analysis Of The Inland Bulk Carrier

Because of the relatively smaller tonnage of inland river ships, inland river bulk carrier structure evaluation is mainly according to Standard Calculation, and structure forms beyond Standard need direct calculation, which the Standard requires. Inland bulk carriers mostly adopt large-hatch and through-cabin ship type in order to make this kind of bulk cargo handle conveniently and raise the wharf handing efficiency. However, with the ship tonnage and hatch length increasing, large-hatch and through-cabin structural form would in generally take some potential safety hazards. So Sea-going Steel Ship Rules specify that the length of a single cargo shall not exceed30m; In the mean time,2012modified notification of the Inland Standard also increases the rule:"...for the vessel with large hatches, its length of the cargo hold should not be less than0.65times of the vessel length, and at least it should be divided into two independent cargo hold, whose length should be no more than45m."This thesis uses an inland dry bulk carrier as the research object. Its transverse bulkhead in the middle area of the cargo hold is established according to single hatch opening length regulation in the inland rules. Then build the whole ship structure3D finite element models of object1with a transverse bulkhead and object2having a chase tank. After that17kinds of calculation conditions are selected in this paper, in which suitable applied load caused by the different arrangement of cargo are considered, and the equivalent design waves (EDW) is used as outboard wave conditions. The load boundary condition in the two models is free constraint. Afterwards the two models are calculated by MSC.Nastran, consequently the yielding strength of the main structure and the buckling strength of the main panel of both object ships are assessed. At last the results of the two types of structure are analyzed and compared. Besides, the influence of deformation and stress (strength) of the hull structure contributed by adding a transverse bulkhead in the middle of the cargo hold is studied.Two structure strength of the bulk carrier with and without a middle transverse bulkhead are compared and analyzed in this paper. The two main conclusions are gained as follows:1. In the case of the length of the single hatch in inland through-cabin type ship exceeding the requirement of the rules, establishing a transverse bulkhead in the middle area of cargo hold brings bad influences to the yielding strength of cargo hold structure, and is beneficial for the buckling strength regarding to the main panels of the inner shell and inner bottom and makes no advantage to the buckling strength of the other panels.2. Concerning the inland through-cabin type ship of the bulk carrier, there is an obvious stress concentration in the connection between cargo hold and transverse bulkhead.The thesis can provide a reasonable strength assessment for this sort of bulk carrier, and also give references for the development of this kind of structures, and provide basis and references to the inland standard precertification and modification...