2.1.1 The
Rules embody structural requirements for linkspans and have been developed
to enable adequate regulatory evaluation by normal methods of structural
analysis on the basis that:
-
The wave induced
loads and load variations on the structural components are not of
an excessive order during normal operations, and: Should the wave
induced loads and load variations (relative to the response sensitivities
to these loads of the proposed structure) be envisaged by the designer
or by LR as being of a sufficiently high order, then suitable model
tests or, if feasible, advanced mathematical hydrodynamic analyses
are to be carried out to determine their magnitudes. (See
Pt 1, Ch 2, 4.2 New construction surveys 4.2.2), and
-
The structural
complexity of the proposed arrangements is limited: Should, in
the judgement of the designer or of LR, the proposed structural arrangements
be too complex for normal methods of analysis in use, then direct
calculations using advanced structural analysis techniques, for example,
finite element analyses, are to be carried out. In such cases the
acceptance criteria are to be as for normal methods of analysis unless
specially agreed otherwise by LR and the calculations are to comply
with the following requirements.
2.1.2 Where
direct calculations are carried out the following details are to be
submitted:
-
a description
of the calculation logic and the procedures used, together with the
name of any computer program used. Reference should also be made to Pt 3, Ch 1, 3.1 Alternative arrangements and scantlings 3.1.2;
-
diagrams of
structural modelling;
-
a summary
of analysis parameters including component sectional properties, boundary
conditions, and means of applying the loads;
-
a schedule
of load cases including a summary of input data for each;
-
a sufficiently
comprehensive summary of output.
2.1.3 In
general, it will not be necessary to submit large volumes of input
and output data associated with programs such as finite element analysis
unless specifically requested.
2.1.4 The
responsibility for specification and input of program data, and the
subsequent transcription of output, together with the integrity of
the program, rests with the Designer.