Ultimate Strength of a Rectangular Plate under Thrust : with Consideration of the Effects of Initial Imperfections due to Welding(Welding Mechanics, Strength & Design)

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Steel structures are in general constructed by welding, and the structural elements are always accompanied by welding residual stresses and distortion. One of the most commonly used welded structure is a box girder such as ship hulls or some type of bridges. In these structures, the deck plates are the main strength members, which are usually subjected to compressive and/or tensile loads. The deck plates are reinforced by a number of stiffeners, and are sub-divided into narrow strip plate elements. When the ultimate strength of a deck plate is considered, that of a strip plate element plays an important role. From these view points, the ultimate strength of a rectangular plate under thrust is investigated taking into account of the effects of the shape and the magnitude of initial deflection. For this purpose, two series of the elastic large deflection analysis by the analytical method and the elastic-plastic large deflection analysis by the finite element method are carried out. From the results of the investigation, it was found that the minimum ultimate strength is attained when the aspect ratio of one half-wave at collapse is about 0.7 for small initial deflection, which decreases as the magnitude of the initial deflection increases.
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