2.2.1 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.
2.2.2 Where direct 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.
2.2.3 LR will be ready to consider the use of Builders’ 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.