CFEM Offshore Engineering, 6, Boulevard Henri Sellier, BP304, 92156, Suresnes Cedex, France
Institut Francais du Petrole, 1 à 4, avenue de Bois Préau, BP311, 92506, Rueil Malmaison Cedex, France
Abstract:
A 2-D analysis of the soil-structure interaction for a jack-up platform is presented. The special features of the analysis are:
• -soil behaviour modelling under cyclic loading uses elasto-plastic equations with a multiple yield surface and kinematical hardening;
• -the study is not executed on a single isolated spud-can, but on a more comprehensive structural model including the soil and a 2-D reduction of a complete jack-up structure;
• -the loading history consists of some one-hundred cycles representing two storm sea states separated by small set-up cycles.
The main result is that the bottom fixity displayed during the first storm is not significantly degraded during the second storm, even though irrecoverable displacements and rotations occur.