Abstract
As ships become larger and faster, attempts are being made to reduce weight by optimally arranging structures and expanding the application of high-strength steel. From the shipyard's perspective, this reduces construction costs, and from the shipping company's perspective, fuel efficiency increases. As weight is reduced, the use of thinner plates increases, resulting in excessive deformation even with the same welding heat, resulting in significant loss of time and cost during correction work. In particular, ship accommodations are structures that use the highest percentage of thin plates, so the time and cost involved in corrections are often an issue. In this study, we analyzed the standards for welding deformation for representative plates subjected to compressive loads in ship accommodations, and analyzed the reasonable initial deflection size for buckling strength design. Longitudinal and lateral compressive loads were selected as the main load components, and nonlinear finite element analysis was performed to summarize the strength pattern according to plate thickness. Through various considerations, the intermediate initial imperfection amount proposed by Smith’s equation was found to be the most physically feasible as it could take into account changes in plate width, yield strength, and thickness. The main contents discussed in this study are expected to be used as important data to predict changes in buckling strength due to welding deformation of thin plates.
Publisher
The Korean Welding and Joining Society