Simple Prediction Methods for Welding Deflection and Residual Stress of Stiffened Panels(Welding Mechanics, Strength & Design)

概要

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In box-girder structures such as hulls of ships and bridges, deck plates play an important role for longitudinal bending strength. There have been a number of reports on the behavior of a stiffened deck plate subjected to in-plane compressive loads until the compressive ultimate strength. The authors also have studied this subject in series. It is known from the results of these researches that welding initial imperfections, such as initial deflection and residual stress, produced in a deck plate largely influence its compressive ultimate strength. Initial deflection and residual stress distribute very complicatedly in an actual deck plate panel. It takes much time to accurately obtain them. In this research, the production mechanism of initial imperfections is clarified and a new method is developed to estimate average initial imperfections so simply as by hand calculation. The new estimation method is applied to mild steel deck plate panels to show its good accuracy in comparing with actual measured initial deflections of ships. It is also applied to HT steel (high tensile strength steel) deck plate panels to investigate how initial imperfection varies among different kinds of steel.
大阪大学の論文