Effects of Welding Residual Stresses and Initial Deflection on Rigidity and Strength of Square Plates Subjected to Compression (Report II)

概要

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When welding is applied for construction of structures, shrinkage of welded portion may produce initial imperfections, such as residual stresses and distortion, in structural elements. This distortion is accompanied by local bending stresses which correspond to the curveture of the distortion. In this 2nd report, influences of residual stresses, geometrical changes and local bending stresses of the distortion upon the behavior of a square plates under thrust were studied. A series of theoretical analysis was carried out using the finite element method. From the results of analysis, it was found that these factors reduce ultimate strength of the plate under thrust, and welding residual stresses reduce buckling strength remarkably, but not so much ultimate strength. Finally, a relation between the ultimate strength and the allowable initial deflection specified by the Japan Shipbuilding Quality Standards was discussed.
大阪大学の論文