Section 2 Direct calculations

2.1.1 Direct calculations may be specifically required by the Rules or may be required for craft having novel design features, as defined in Pt 3, Ch 1, 1.2 Exceptions, or may be submitted in support of alternative arrangements and scantlings. Clasifications Register (hereinafter referred to as 'LR') may, when requested, undertake calculations on behalf of designers and make recommendations in regard to suitability of any required model tests.

2.1.2 Where model testing is undertaken to complement direct calculations the following details would normally be required to be submitted: Schedule of tests, details of test equipment, input data, analysis and calibration procedure together with tabulated and plotted output.

2.2.1 In cases where direct calculations have been carried out, the following supporting information should be submitted as applicable:

1. Reference to the direct calculation procedure and technical program used.

2. A description of the structural modelling.

3. A summary of analysis parameters including properties and boundary conditions.

4. Details of the loading conditions and the means of applying loads.

5. A comprehensive summary of calculation results. Sample calculations should be submitted where appropriate.

2.2.2 In general, submission of large volumes of input and output data associated with such programs as finite element analysis will not be necessary.

2.2.3 The responsibility for error free specification and input of program data and the subsequent correct transposal of output rests with the Builder.

2.3.1 Longitudinal strength calculations are to be submitted for all craft with a Rule length, L _R, exceeding that specified in Pt 6, Ch 6 Hull Girder Strength, Pt 7, Ch 6 Hull Girder Strength and Pt 8, Ch 6 Hull Girder Strength, for steel, aluminium alloy and composite respectively, covering the range of load and ballast conditions proposed, in order to determine the required hull girder strength. Still water bending moments and shear forces are to be calculated for both departure and arrival conditions and for any special mid-voyage conditions caused by changes in ballast distribution.

2.3.2 Where the Rule length, L _R, does not exceed that indicated in Pt 3, Ch 1, 2.3 Global hull strength 2.3.1, longitudinal strength calculations may be required at LR's discretion, dependent upon craft proportions, the proposed loading, structural configuration and material of construction.