RR094 - Technical performance measures for North Sea jacket structures
Describes the methodology that has been developed to enable a
first point assessment of North Sea steel jacket structures to be
made. This de-emphasises the quantitive structural reliability
predictions that are currently employed in the North Sea safety
case regime and employs a more qualitative approach to assessing
the structural reliability of individual installations, taking into
consideration the age of the structure, structural configuration
and functionality to generate a relative risk index. This index is
semi-quantitive and provides an indication of the structure's
performance in relation to other steel jacket fixed installations.
The measure of vulnerability is based upon the load capacity of the
undamaged structure and that when the structure's most critical
bracing member is severed. The measure of a platform's
consequence of failure is based upon a semi-quantitative approach
that considers the nature of the field and the platform's
functionality. Benefit is taken from a bridge-linked complex.
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