3.1.1 In addition
to cases where direct calculations are specifically required by the
Rules, LR will consider alternative scantlings which have been derived
by direct calculations in lieu of specific Rule requirements. All
direct calculations are to be submitted for examination.
3.1.2 Where
calculation procedures are employed, supporting documentation is to
be submitted for appraisal and this is to include details of the following:
- calculation methods;
- assumptions and references;
- loading;
- structural modelling;
- design criteria and their derivation, e.g. permissible stresses,
factors of safety against plate panel instability, etc.
3.1.3 LR will
be ready to consider the use of Builder’s programs for direct
calculations in the following cases:
-
Where it can be
established that the program has previously been satisfactorily used
to perform a direct calculation similar to that now submitted.
-
Where sufficient
information and evidence of satisfactory performance is submitted
to substantiate the validity of the computation performed by the program.
3.1.5 Where
no special reference is made in this Part to specific requirements,
the construction is to be efficient for the intended purpose and to
conform to good practice.
3.1.6 Where
items are of a novel or unconventional design or manufacture, it is
the responsibility of the designer to demonstrate their suitability
and equivalence to the Rule requirements.