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12 86238


86940


Multiple scales give T


In the process of evaluating an offshore structure during its design or while in operation, model tests, simulations and offshore (full-scale) measurements all clearly complement one another. As an example of such integrated use, Report presents the overall


methodology as it has been developed to investigate the loading and response of the South Arne platform, which consists of a Gravity Base Structure and lattice tower. This resulted in a unique project, including the novel combination of small-scale tests of the


complete structure with large scale component testing of parts of the lattice tower to limit scale effects.


Here, we provide the first glance of an important paper due to be present at the OTC 2009.


Bas Buchner & Robert Heerink r.heerink@marin.nl


24 report


he South Arne platform, operated by Hess Denmark, was installed in 1999 in the Danish sector in a 60 m


water depth. A further analysis of the plat- form was initiated by Hess to verify the structural performance of the platform in its operational condition, with the aim of extending the platform’s capabilities. The original structural behaviour was deter- mined based on a Finite Element (FE) model, including Morison wave loads with standard hydrodynamic coefficients. This method is widely used when designing fixed offshore structures. However, there is a need for a more accurate representation of the wave loading than those recommended in the standards. Therefore, model tests, simulations and offshore measurements are used in an integrated way to determine the reliability of the applied models with respect to the fluid loading and hydrodynamic shielding in particular.


At MARIN four series of model tests were carried out in this process: - Small-scale tests of the GBS and lattice tower combined. These 1:63.2 scale tests give insight in overall wave loading and loading on specific parts of the structure in realistic waves, including the effects of wave diffraction around the column, wave


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