Dynamic characteristics estimation from the ambient vibration of existing bridge by realization theories

• Ali Md. Rajab

  Nagasaki University

• Okumatsu Toshihiro

  Dept. of Civil Eng., Nagasaki University

• Okabayashi Takatoshi

  Dept. of Civil Eng., Nagasaki University

• Jawaid Bashir Ahmed

  Nagasaki University

抄録

An automatic estimation system for bridge dynamic characteristics (frequency, damping ratio, and vibration mode) under ambient vibration by ERA, ERA/DC and PHCA method is presented in this paper. The Hankel matrix was derived from block covariance of ambient vibration data. The experiments were conducted under (a) strong wind, (b) weak wind and (c) under traffic condition to estimate the dynamiccharacteristics of existing steel langer girder bridge. As a result of this study, the better result is realized from the strong wind data. In contrast, the inducement of high frequency by the data under traffic condition leads to frequent estimation of higher mode with inconsistent level of accuracy. In the various method of analysis, ERA/DC method has the advantages for its simple algorithm and ability to provide accurate estimation with fast calculation speed.

収録刊行物

• 構造工学論文集 Ａ

  構造工学論文集 Ａ 55A 284-294, 2009

  公益社団法人 土木学会

キーワード

• ambient vibration
• system identification
• dynamic characteristics estimation
• realization theory

詳細情報

• CRID: 1390001205284085760
• NII論文ID: 130004950449
• DOI: 10.11532/structcivil.55a.284
• ISSN: 1881820X
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可