At steel girder edges, remarkably reduced thickness, which is caused by steel corrosion due to water leakage from the expansion joint, is observed and leads to the reduction in the load-bearing capacity. However, in order to grasp the thickness reduction amount, the important challenge in many cases is to remove the rust. Additionally, it is also an obstacle for the health evaluation. For this reason, to understand vibration characteristics in the case where the lower end thickness of the web panel has been reduced, this study investigates soundness evaluation method based on the MAC by concentrating on web vibrations, local measurements, and numerical analysis.
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