Section 2 Rule structural concept

2.1.1 The Rules are based on the concept that the structural and watertight integrity and general safe operation of the craft will not be compromised by static and dynamic loads experienced during normal operating conditions.

2.2.1 Scantlings are generally based on the strength required to withstand loads imposed by the sea, cargo, passengers, ballast, bunkers and other operational loads. However, the Rules assume that the nature and stowage of the cargo, ballast, etc. are such as to avoid excessive structural stress.

2.2.2 Design loads and pressures as given in Pt 5 Design and Load Criteria, are to be used with scantling formulae or direct calculation methods to derive scantlings based on maximum allowable stress or other suitable strength criteria.

2.2.3 Hull structural vibration resulting from cyclic loadings arising from the sea and other sources are to be such that the normal operation and structural integrity of the craft are not impaired. However, these aspects are outwith the scope of classification, see Pt 1, Ch 2, 1.4 Scope of classification.

2.3.1 Static loads are based on standard conditions defined in Pt 5 Design and Load Criteria, or determined from loading conditions submitted by the Builder.

2.3.2 Dynamic loadings are examined for both the local and global structures. These loadings are based upon the designer's stated operational and environmental conditions or the Rule minimum criteria, whichever is the greater.

2.3.3 Wave induced loads are considered both in the static condition, i.e. hydrostatic and pitching pressures, and in the dynamic mode i.e. impact, slamming and hogging and sagging wave landing conditions.

2.3.4 Hull girder strength will in general require to be investigated dependent upon the length, configuration, proportions, proposed loadings etc. of the craft.

2.3.5 Scantling requirements in respect of miscellaneous items of structure such as local foundations, base plates, insert plates, etc. are not specifically indicated within these Rules. However the acceptance of such items will be specially considered on the basis of experience, good practice and direct calculation where appropriate.

2.4.1 The various definitions and structural terms for use throughout this Chapter are as indicated within the appropriate Section.

2.5.1 The various symbols for use throughout this Chapter are as indicated within the appropriate Section.