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Publicações
Chen, N-Z., Wang, G., Guedes Soares, C., e Teixeira, A.P. (2011), “Combination of primary loading effects under various wave scatter diagrams”, Advances in Marine Structures, C. Guedes Soares and W. Fricke, (Eds.), Taylor & Francis Group, London, UK, pp. 651-657
A case study was conducted to investigate the extreme value of the combination of still-water bending moment (SWBM) and vertical wave-induced bending moment (VWBM). Three wave scatter diagrams, namely ABS Base 1, Base 2, and one from IACS Rec No.34, were used for the prediction of the extreme value of the VWBM based on the extreme value theory and response amplitude operators (RAOs). The SWBM is modeled as an alternating renewal pulse process. The point-crossing method, load coincidence method, and Ferry Borges Castanheta method are utilized for the prediction of the extreme value of the combination of SWBM and VWBM. A sample tanker under sagging condition is utilized for the case study and results show that for the predicted extreme values of the combination of SWBM and VWBM: 1) the results predicted based on the wave scatter diagram of ABS Base 1 are higher than those predicted based on ABS Base 2 or IACS; 2) the results based on the wave scatter diagrams of ABS Base 2 and IACS are very close; 3) the point-crossing method and load coincidence method yield almost identical results; 4) The Ferry Borges Castanheta method yields higher values than those predicted by the point-crossing method or the load coincidence method; 5) the highest value with a design period less than 20 years is 93.3% of the total design bending moment, which is predicted by the Ferry Borges Castanheta method based on the wave scatter diagram of ABS Base 1.
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