December 2024
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Japanese Journal of JSCE
Effective inspection of noise barriers installed along expressways and high-speed railways is required since they can suffer damage due to corrosion of anchor bolts, aging of the anchorage, and external forces caused by earthquakes, typhoons, and traffic. This study focuses on the vibration behavior of noise barrier posts and experimentally reveals that asymmetric vibrations occur due to differences in base constraint conditions. Furthermore, using a multi-degree-of-freedom model with torsional springs, asymmetric vibrations were numerically replicated. As a result of investigating damage detection focusing on modal vibration frequencies and shapes, it was shown that instantaneous vibration frequencies can be identified with less than 1% error from non-contact displacement measurements. Additionally, the potential for assessing the state of anchorage based on instantaneous displacement was demonstrated.