A parametric study of the non-linear dynamic behaviour of an offshore jack-up unit
The dynamic response of an offshore jack-up unit to environmental loads has been investigated using a two-dimensional, nonlinear finite element model. The model includes realistic representations of the wave loading, the geometric non-linearities of the rig legs and the complex non-linear effects of...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
1999
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| Summary: | The dynamic response of an offshore jack-up unit to environmental loads has been investigated using a two-dimensional, nonlinear finite element model. The model includes realistic representations of the wave loading, the geometric non-linearities of the rig legs and the complex non-linear effects of combined loads on the spudcan footings. Results are presented from a parametric study in which a typical jack-up unit was subjected to waves of varying height and period. It is shown that the accurate non-linear modelling of both the legs and the spudcan footings has a significant effect on the rig dynamics. The widespread practice of modelling the footings as simple pinned supports may be non-conservative for some sea states. |
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