Ph.D. Tezi Görüntüleme

      In this study, the main target is determined as estimation of the hull girder ultimate strengths of ships as close to real behavior. In this context, the load-end shortening curve relationships of structural members such as single plates, single stiffeners, plate-stiffener combination beam-column elements, stiffened panel elements and hard corner elements of hull girders under vertical bending moment have been determined by numerical, empirical and analytically. Then, the progressive collapse calculations have been performed using the determined load-end shortening curves. Finally, ultimate strength of hull girder has been obtained as the peak value of moment-curvature curve, saying the maximum load carrying capacity under maximum vertical bending moment. In Chapter 2, the problem definition, the main terms and assumptions of the solution have been given. Also the load-end shortening curves of structural elements had been obtained by "limit state design approach", "membrane stress approach", orthotropic panel approach" and the rules of IACS-CSR. Then, the details of Smith method progressive collapse calculations have been described. In Chapter 3, the ultimate strength benchmark studies for structural elements, box girder, 1/3 scale frigate and real ships that have test and/or analysis results in the literature have been performed and the comparison results have been examined with tables and graphs. In Chapter 4, general results obtained after study and recommendations have been presented. Satisfactory results in terms of the main target have been obtained for both, load-end shortening curves and ultimate strength calculations.

       method, Marguerre plate equations, Orthotropic panel approach