Dynamic analysis of Jack-ups

Master thesis (1990)

Authors

Contributors

J.A. Battjes (mentor)
M.W.J.W. Dijkman (mentor)
W.W. Massie (mentor)
Programme
offshore (CEG) (TU Delft)
Copyright: © 1990 Kraak, A.W.
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Published Date

01-06-1990

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Programme

offshore

Abstract

Jack-up offshore structures have a natural period which lies in the high frequency tail of the spectra of North Sea storm waves. This taxi has Significant energy and the jack-up may experience significant dynamic Data have become available from field measurements of the dynamic behaviour of the Maersk Guardian jack-up rig. These data have been compared to simulations performed with Shell's time domain dynamic analysis program "DYNAL". A simplified model of the Maersk Guardian has been developed, and has been used in the simulations under environmental conditions similar to those during the measurements. A comparison has been made between the simulated and the measured deck accelerations and leg forces, by examining spectra and time histories. The results of the simulations were in reasonably good agreement with the measurements. Further research on the damping, the deck to leg connection and the foundation stiffness is desirable.

Files

Kraak1990.pdf
(pdf | 41 Mb)