抄録
Recently, HT steel is widely used to reduce the weight of a ship's hull. Because of this, the plate thicknesses in ship structures have become thin. However, to prevent the buckling, there exist some restrictions to thin the plate thicknesses. So, to use the HT steel effectively, this restriction should be removed and the elastic panel buckling has to be allowed. When the panel elastic buckling is allowed, it is necessary to get precise understandings about the post-buckling behaviour of thin plates. From this point of view, this paper discusses the post-buckling behaviour of thin plates under thrust including the secondary buckling phenomenon. Series of elastic large deflection analyses were perfomed on rectangular plates with various boundary conditions applying the analytical method and the FEM. The aspect ratio of the plate is chosen to be around 1.0. It has been found that: (1) The primary buckling mode of a simply supported rectangular plate is represented by a single deflection component. However, above the primary buckling load, other deflection components also increase with the increase of compressive load. (2) After the primary buckling, the secondary buckling takes place, of which deflection mode is three half waves in the loading direction for a simply supported plate and is two half waves for a clamped plate. (3) The inplane rigidity, which is reduced after the primary buckling, is much more reduced after the secondary buckling.
