Response of fixed offshore platforms to wave and current loading including soil–structure interaction |
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| Authors: | Yasser E Mostafa M Hesham El Naggar |
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| Institution: | a Geotechnical Engineer, Golder Associates, Burmnaby, B.C., Canada;b Associate Professor and Research Director, Geotechnical Research Centre, Faculty of Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9 |
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| Abstract: | Fixed offshore platforms supported by pile foundations are required to resist dynamic lateral loading due to wave forces. The response of a jacket offshore tower is affected by the flexibility and nonlinear behaviour of the supporting piles. For offshore towers supported by clusters of piles, the response to environmental loads is strongly affected by the pile–soil–pile interaction. In the present study, the response of fixed offshore platforms supported by clusters of piles is investigated. The soil resistance to the pile movement is modelled using dynamic p–y curves and t–z curves to account for soil nonlinearity and energy dissipation through radiation damping. The load transfer curves for a single pile have been modified to account for the group effect. The wave forces on the tower members and the tower response are calculated in the time domain using a finite element package (ASAS). Several parameters affecting the dynamic characteristics of the platform and the platform response have been investigated. |
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