Study on Ultimate Strength of Semi-submersible Drilling Platform

摘要

The research on the design method based on Ultimate Limit State(ULS)for the semi-submersible drilling platform was carried out. This paperintroduced the ULS, analysis methods for ultimate strength. Then,based on the ABAQUS finite element package, numerical simulationson stiffened plates were performed, especially on analysis methods,effects of initial deflection, results analysis technologies and so on. Thenumerical simulation technologies were summarized. Furthermore, thestructural models, load models and boundary conditions of the semisubmersibledrilling platform were analyzed; the ultimate forces anddamage modes of the target platform under the load modes due to splitforce between pontoons, longitudinal shear force and torsion momentabout transverse horizontal axis were analyzed; the equivalent modelsand effects on the results and computational efficiency of stiffenedmodels, and the engineering numerical techniques for ultimate strengthof semi-submersible platform were proposed. The structural designtechnology for semi-submersible platform based on the ULS wasproposed. The recommendation for the semi-submersible drillingplatform structural design was put up.