3.1.1 In addition
to cases where direct calculations are specifically required by the
Rules, LR will consider alternative arrangements and 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 other than those available from software published by LR
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.
3.1.4 Alternative
arrangements or fittings which are considered to be equivalent to
the Rule requirements will be accepted.
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 Builder to demonstrate their suitability and
equivalence to the Rule requirements.
3.1.7 Alternative
arrangements which are in accordance with the requirements of a National
Authority may be accepted as equivalent to the requirements of this
Part of the Rules.