2024 Volume 12 Issue 2 Article ID: 23-13137
The arch aqueduct bridge has a lower load than other bridges and its dynamic behavior is complicated. In this study, we verified the effectiveness of vibration monitoring to detect the damage of hanging members comparing the bridge with damage and the one without damage, as a case study of the Musota aqueduct bridge in Wakayama City. After that, a three-dimensional finite-element (FE) model of this bridge was developed to simulate its dynamic properties of the bridge. The corrosion effects of hanging members to the natural frequency of the aqueduct bridge were considered by changing the cross-section area of hanging members with 10, 25, 50, and 80 percent, respectively. As a result, the microtremor observation, as well as FE analysis, showed that the natural frequency of damaged bridge is lower than that of non-damaged bridge. By considering the corrosion of hanging members at different levels, the frequency decreased. The research findings, derived from both micro-tremor observation and FE analysis, consistently indicated that the natural frequency of the bridge with structural damage is notably lower than that of its undamaged counterpart. Furthermore, as the extent of corrosion applied to the hanging members incrementally increases, there is a corresponding gradual reduction in natural frequency. These results align coherently, highlighting the detrimental impact of corrosion on the bridge’s structural integrity and its direct correlation with diminished natural frequencies.