Section 1 Stern area structural analysis

1.1.1 A structural analysis is to be provided for the stern area of the ship. The purpose of the structural analysis is to validate the integration between the stern and the propulsion unit with the global ice load forces determined for the propulsion unit when going stern first.

1.2.1 The structural analysis model is to extend from the extreme stern to the first bulkhead aft of the propulsion unit in the stern first mode.

1.2.2 The model may be of half breadth, provided arrangements are symmetrical about the centreline.

1.2.3 Openings are to be considered.

1.3.1 The axial and tangential global loads as derived in Ch 4 Main and Auxiliary Machinery are to be applied to the model as separate and combined longitudinal and transverse load cases.

1.3.2 The propeller blade break load at 0,8R as derived from Table 4.2.3 Bearing axial and tangential ice loads using simplified blade break force for initial dimensioning in Chapter 4 is to be applied as a load case considering the breaking load in its worst (lowest) position.

1.3.3 Load cases, including accounting for the propulsion unit self weight and hydrostatic loads, may be required, based upon the actual aft end arrangement and geometry. See also Pt 5, Ch 9, 4.3 Direct calculations of the Rules for Ships.

1.3.4 Maximum combined stresses and buckling strength are to be assessed. The limiting design stress criteria are to be taken from Pt 5, Ch 9, 4.2 Hull support structure 4.2.6 of the Rules for Ships.