Publicações

Hussein, A.W. e Guedes Soares, C. (2014), “Analysis of the relative importance of ultimate limit state variables in the reliability analysis of tankers and bulk carriers”, Developments in Maritime Transportation and Exploitation of Sea Resources, Guedes Soares, C. and López Peña F. (Eds.). Francis & Taylor Group, London, UK, pp. 711-720

The main target of this paper is to compare the importance from a reliability point of view of the variables included in the Ultimate Limit State function for tankers and bulk carriers. Three tankers and three bulk carriers are considered for this study. The ultimate strength is calculated using Smith's method. The stochastic still water bending moment is calculated based on data from the loading manual which reflects the actual loading model of the ship. The wave bending moment is based on direct calculations of wave induced load, determining the extreme value. In many cases full data about the ship are not always available, therefore, a load model is proposed based on the rule design values to be used when data are missing. The still water bending moment is taken the mean value 70% load manual value, which will be assumed to be 0.9* the rule design value. The wave induced moment is modeled as Weibull distribution, the scale parameter will be adjusted to give probability of exceedance Q=10-8 for the rule design value. After performing the reliability analyses based on the proposed load modeling, the importance of variables included in the ultimate limit state function for both ship types is calculated and compared to measures the importance of the design variables and their impact on structural safety.

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