Ultimate strength is an important indicator of the adaptability to changing environment of semi-submersible platforms. As corrosion damage has significant effects on the ultimate strength, the corrosion damage factor should be taken into account in the platforms structural safety evaluation process. The basic theories and researching methods of ultimate strength are expounded and the corrosion forecasting mathematical model is established in this paper. Taking 3000m deep sea semi-submersible platforms as research objects, the parameterized model of typical component and node is established by taking corrosion thickness as variable using the finite component software. Based on the gradual damage calculation method and finite component analysis method, the load is increased progressively according to proportion increment theory. The ultimate bearing capacity of typical component and node is calculated under the corrosion damage. The ultimate bearing capacity evolution law of typical component and node under various failure modes and various service years is summarized.

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