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Publications
Makouei, S.H., Teixeira, A.P. and Guedes Soares, C. (2015), ), “A study on the progressive collapse behaviour of a damaged hull girder”, Maritime Technology and Engineering, Guedes Soares, C. & Santos T.A. (Eds.), Taylor & Francis Group, London, UK, pp. 405-416
In the International Association of Classification Societies’ Common Structural Rules (IACS-CSR), the hull girder ultimate capacity criterion for intact ships is an important check to ensure the structure will not collapse under the maximum expected load scenarios. In addition to its intact strength, the hull girder ultimate capacity needs to be assessed in various damaged conditions. The assessment of the residual ultimate strength of the ship in a damaged condition is useful for assessing the capabilities of a particular structural arrangement. This study takes into account the influence of the rotation of the neutral axis on the residual hull girder strength of asymmetrically damaged ships under longitudinal bending to obtain a simple design formula to predict the residual strength of a damaged ship from its intact strength. For this purpose a simplified pure incremental method is developed to calculate the progressive collapse of the damaged cross section under combined bending using the analytical stress-strain curves for stiffened plate elements, hard corners and plate elements. Firstly, the results of the developed program are compared with experimental results of intact and damaged box girders available in the literature. Then, the progressive collapse analysis of an AFRAMAX tanker ship in different damage scenarios is performed. A set of simple design formulas are developed to obtain responses for different operating conditions and damage parameters.
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