Abstract
The steel girder ends of existing bridges in the Hokuriku region are locally corroded due to deck joint leakage, and this may result in decreased thickness of steel material in some cases. To aim for an inspection method using web vibration mode, this study conducted experimental models based on an actual steel girder end and undergone different damage scenarios such as variation in the corrosion range and thinning amount. Then, the natural vibration analysis was carried out to investigate the influence of the simulated deteriorations on natural frequency and vibration mode shape. In particular, specimens simulating the corrosion part was manufactured, and vibration measurements were later performed to confirm the detectable frequency and the vibration mode shape, the influence of web thickness and corrosion range, the validity of the analysis values, and to figure out efficient approaches for on-site measurement. Based on the results of above investigations, an inspection method using vibration modes focusing on web vibration against the corrosion of steel girder end was proposed.
