橋梁測定

[I-60] Investigation of effects of vehicles on dynamic characteristics of a steel girder bridge by long term monitoring

*吉中 正滋¹、小川 大智²、宮森 保紀¹、大胡 拓矢³、富岡 昭浩³、宮下 剛⁴ (1. 北見工業大学、2. IHIインフラシステム、3. 日本航空電子工業、4. 長岡技術科学大学)

Keywords:bridge health monitoring , vibration characteristics, traffic volume

The vibration characteristics of bridges obtained from monitoring data are affected by temperature and traffic vehicles, so it is necessary to investigate the changes of the vibration characteristics due to temperature and traffic effect. In this study, the number of vehicles was estimated from the monitoring data, investigating the influence of the number of vehicles on the variation of the predominant frequency. It was confirmed that the number of vehicles can affect the predominant frequency, and the predominant frequency tends to decrease with the increase of the number of vehicles.