Despite the efforts to reduce ship accidents, the collision between supply vessels and offshore platforms continue to happen. The aim of the present paper is to evaluate the ultimate buckling residual strength of a typical semi-submersible platform column damaged by a supply vessel collision. DNV recommendations are adopted for the sideways collision and either bow or stern collision, corresponding to a supply vessel of 5,000 ton displacement with impact velocity of 2 m/s. Additionally, some cases considering the tendency in the world market for supply vessels with larger dimensions and more powerful propulsion are considered. This brings additional questions about the structural integrity of the floating unit represented by the column residual strength able to resist the deck loading up to the repair work to be performed. In this paper the program ABAQUS was used to carry out the dynamic collision simulation. The buckling analysis was validated using a finite element model considering geometric and material nonlinearities as in previous correlation studies with small scale experiments. Residual strength results from the damaged column are compared with the ultimate strength of equivalent intact column to estimate the safety margin associated with the column structural capability after supply vessel collision.

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