Compressive Strength of Plate Elements with Welding Residual Stresses and Deformation

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When steel structures are constructed by welding, the structural elements are always accompanied by welding residual stresses and distortion. Usually plate structure is considered to consist of plate elements of various sizes. Among these elements, deck and bottom plating play a most important role in the strength of ships and bridges. These plates are reinforced and sub-divided by stiffeners into narrow, strip plate elements. These sub-divided plate elements sustain mostly in-plane axial forces, which are either tensile and/or compressive. Accurate assessment of compressive strength of these plate elements containing welding residual stresses and distortion is very important to insure the safety of welded structures. The recent rapid development of high speed computers has enabled us to conduct nonlinear analyses. Using this advantage in this paper, buckling and ultimate strengths of rectangular plates and stiffened plates with welding residual stresses and/or deformation under compression have been comprehensively investigated both theoretically and experimentally. For theoretical analyses, several methods were applied including the finite element method which the authors have developed. From the results of the investigation, it was found that welding residual stresses and deformation reduce the buckling and ultimate strengths and their effects become greater for thicker plates up to (b/t)√<σ_Y/E><1.8. The one exception is the case when a stiffened plate buckles in the over-all mode.
大阪大学の論文

Compressive Strength of Plate Elements with Welding Residual Stresses and Deformation

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