Long-term remote monitoring of a cable stayed bridge and seasonal fluctuation of modal parameters

摘要：

In vibration based health monitoring,a little change of natural frequencies would be observed.However changes of modal parameters are also observed on intact civil structures by environmental effects.Hence it is worth to investigate the effects of environmental fluctuation as basic information of long term structural monitoring.The authors continue remote vibration monitoring of a cable stayed bridge in Hokkaido,Japan.9 accelerometers and 2 thermometers are installed in the bridge.More than 1,200 samples of ambient vibration have been collected in 2 years.The Natural Excitation Technique(NExT)and the Eigensystem Realization Algorithm(ERA)are applied to ambient vibration data for detecting little changes of modal parameters.Temperature in the pylon fluctuates between-10 to 30 degrees Celsius throughout a year.And the natural frequency of the most predominant mode changes 3％ according to temperature fluctuation.The relationship between modal parameters and temperature fluctuation is investigated in this study.

关键词： Remote monitoring ERA Long-term monitoring Cable Stayed Bridge

作者: Y. Miyamori H. Kimura T. Oshima T. Ayame

作者单位: Kitami Institute of Technology,Kitami,Hokkaido,Japan Engaru Town Office,Engaru,Hokkaido,Japan

会议类型: 国际会议

会议名称: The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)

会议地点: 重庆·南京

会议语种:英文

在线出版日期: 2007-05-01（万方平台首次上网日期，不代表论文的发表时间）