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Abstract
This paper investigates the ultimate strength of a typical truss Spar platform subjected to characteristic hydrodynamic loads using nonlinear finite element analysis with ANSYS. Material nonlinearities are taken into account without giving consideration to geometrical nonlinearities and geometrical imperfections. Main concerns of ultimate global strengths analysis are initial failure place and final collapse states of the whole platform. It can be found that final collapse modes of Spar platform are closely related to corresponding characteristic hydrodynamic responses. Simulation results are discussed and checked by DNV rules. According to failure mechanism of the object platform, ultimate limit state formulations are developed. Performing progressive collapse analysis of truss spar can provide a better understanding of structure behaviour of typical truss Spar under extreme wave conditions. This paper is hopeful to be a good reference to the ultimate limit state of typical truss Spar platforms under characteristic wave load.
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