The dynamic analyses of offshore platforms are mostly based on the lumped mass matrix method in the frequency domain. Although the approximations involved in the lumped mass matrix method are negligible for most of the regular frameworks in comparison with the continuous mass matrix method heavy gravitational loads on the upper decks, wave forces and effects of member axial force and soil-structure interaction may warrant the use of continuous mass matrix method. The dynamic shape functions include, beside the member characteristics, the member axial force and of the member is embedded in soil, the soil characteristics with their real distribution over the members. The variation of the soil characteristics with the properties of granular and cohesive soils is taken into account. The dynamic member stiffness matrices are very much dependent on the ratio of member to soil characteristics. The nature of the dynamic member stiffness matrices change entirely, passing through a transition stage.
Offshore platforms subjected to wave forces
Welleneinwirkung auf Bohrinseln
1986
16 Seiten, 14 Bilder, 28 Quellen
Conference paper
English
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