Recommended practice for planning, designing and constructing fixed offshore platforms, working stress design. Calculation of hydrodynamic loads on offshore truss structures is compared with the corresponding North Sea Design Practice, as given by the rules of Det Norske Veritas. Most emphasisis put on the hydrodynamic coefficients and the estimation of design current as these issues are identified to be particularly critical. The main emphasis with regard to the impact of the new API recommendations, however,is that a consistent approach is provided to the calculation of 100-yr directional loads. This includes taking into account the effect of marine growth on force coefficients, modifying the wave kinematics for directional spreading, and considering current blockage effects, conductor shielding effects, and joint occurrence of wave heigtht and current.It is concluded that a consistent approach, is preferable to the current North Sea Design Practice in this field, and thus that the North Sea Design Practice should be updated. This relates in particular to selection of hydrodynamic coefficients. Measurement programmes to obtain full scale global force data simultaneously wit0 h wave and current data are furthermore recommended.


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    Title :

    Hydrodynamic coefficients for calculation of hydrodynamic loads on offshore truss structures


    Additional title:

    Hydrodynamische Koeffizienten fuer die Berechnung der hydrodynamischen Belastungen von Fachwerk-Offshore-Bauwerken


    Contributors:

    Published in:

    Marine Structures ; 9 , 8 ; 745-758


    Publication date :

    1996


    Size :

    14 Seiten, 3 Bilder, 4 Tabellen, 23 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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