In this study, we analyzed the detailed stress properties of the target part and estimated the crack initiation position by reproducibility analysis for the crack that occurred in the neck near the fulcrum of the I-beam bridge. In addition, welding repair construction tests were conducted to determine the repair method. After that, a load test was carried out on the repaired bridge, and the effect of the repair was confirmed from the difference in stress properties before and after the repair. Finite element analysis was then used to reproduce the tests and confirm detailed stress characteristics that could not be confirmed in the tests, as well as the effects of deformations occurring in the actual bridge on the stresses.
