Title: PROBABILISTIC EVALUATION OF HULL STRUCTURE RENEWALS FOR AGING SHIPS
Abstract: The existing Renewal Criteria of the classification societies are intended to maintain adequate strength of the hull girder and its components. They include control of the hull girder’s Section Modulus and the thickness of plates, web plates and flanges of stiffeners/girders. In addition, there are simplified requirements for the buckling strength of plates and stiffeners/girders. This paper presents the hull girder’s Section Moduli as probabilistic functions at any given ship’s age as a result of the random nature of the corrosion wear. In addition, the thickness of the plates, web plates and flanges of stiffeners/girders are also presented as probabilistic functions at any given ship’s age. This approach provides information about the probability that the ship hull structure will continue to meet the requirements of the Renewal Criteria over any given time-interval. Thus, a more rational assessment of the hull structure can be made during its design, survey and repair. Also, a simple method is developed to present the geometric properties of the hull girder as probabilistic functions at any given ship’s age. The calculations with this method are easy to perform, and their accuracy is very high compared to more complicated mathematical methods such as Taylor series expansion or Monte Carlo simulation. Results from the calculations for a bulk carrier are given as an example.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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Cited By Count: 17
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