Safety Evaluation of I-Girder Bridge Repaired by Welding(Mechanics, Strength & Structural Design)

概要

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It is often expected that steel structures, which have been damaged by an increase of vehicle load, corrosion, and so on, need repair or strengthening. For repair or strengthening, the evaluation of the safety of damaged structures is usually performed. The estimation of the safety of structures, which are subjected to heating, such as cutting and welding, in procedures of repair or strengthening, is difficult but important. However, the safety evaluation methods of damaged structures following repair or strengthening are not yet well enough established. In this paper, a correction coefficient and the equation of load-carrying-capacity with respect to heat input for the safety evaluation of damaged structures following repair or strengthening were proposed. The validity of this correction coefficient and the equation of load-carrying capacity was confirmed by repair welding experiments and 3-D thermal elastic-plastic FEM analysis of a damaged I-Girder bridge. According to the results, tensile residual stress was generated on account of shrinkage after heating. After the repair work, the residual camber displacement was increased.
大阪大学の論文