[1] Li Zhijun, Li Aiqun, Han Xiaolin,. Operational modal identification of suspension bridgebased on structural health monitoring system [J]. Journal of Southeast University (English Edition), 2009, 25 (1): 104-107. [doi:10.3969/j.issn.1003-7985.2009.01.022]

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Operational modal identification of suspension bridgebased on structural health monitoring system()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

25

Issue:

2009 1

Page:

104-107

Research Field:

Traffic and Transportation Engineering

Publishing date:

2009-03-30

Info

Title:

Operational modal identification of suspension bridgebased on structural health monitoring system

Author(s):

Li Zhijun;  Li Aiqun;  Han Xiaolin

School of Civil Engineering, Southeast University, Nanjing 210096, China

Keywords:

suspension bridge;  operational modal identification;  structural health monitoring system;  ambient vibration test

PACS:

U441.3

DOI:

10.3969/j.issn.1003-7985.2009.01.022

Abstract:

An output-only modal identification method by a combination use of the peak-picking method and the cross spectrum methods are presented.Meanwhile, a novel mode shape optimum method of the deck is proposed.The methods are applied to the operational modal identification system of the Runyang Suspension Bridge, which can be used to obtain the modal parameters of the bridge from out-only data sets collected by its structural health monitoring system(SHMS).As an example, the vibration response data of the deck, cable and tower recorded during typhoon Matsa excitation are used to illustrate the program application.Some of the modal frequencies observed from deck vibration responses are also found in the vibration responses of the cable and the tower.The results show that some modal shapes of the deck are strongly coupled with the cable and the tower.By comparing the identification results from the operational modal system with those from field measurements, a good agreement between them is achieved, but some modal frequencies identified from the operational modal identification system(OMIS), such as L1 and L2, obviously decrease compared with those from the field measurements.

References:

[1] Li Aiqun, Miao Changqing, Li Zhaoxia, et al.Health monitoring system for the Runyang Yangtse River Bridge [J].Journal of Southeast University:Natural Science Edition, 2003, 33(5):544-548.(in Chinese)
[2] Koh B H, Dyke S J.Structural health monitoring for flexible bridge structures using correlation and sensitivity of modal data[J].Computers and Structures, 2007, 85(3/4):117-130.
[3] Gentile C, Gallino N.Ambient vibration testing and structural evaluation of a historic suspension footbridge [J].Advances in Engineering Software, 2008, 39(4):356-366.
[4] Peeters B, Ventura C E.Comparative study of modal analysis techniques for bridge dynamic characteristics[J].Mechanical Systems and Signal Processing, 2003, 17(5):965-988.
[5] Magalhaes Filipe, Caetano Elsa.Challenges in the application of stochastic modal identification methods to a cable-stayed bridge [J].Journal of Bridge Engineering, 2007, 12(6):746-754.
[6] Petrin F, Giuliano F, Bontempi F.Comparison of time domain techniques for the evaluation of the response and the stability in long span suspension bridges [J].Computers and Structures, 2007, 85(11/12/13/14):1032-1048.
[7] Nakamuraa Shun-Ichi, Kawasakib Toshitsugu.Lateral vibration of footbridges by synchronous walk [J].Journal of Constructional Steel Research, 2006, 62(11):1148-1160.
[8] Ren Weixin, Peng Xuelin.Experimental and analytical studies on dynamic characteristics of a large span cable-stayed bridge [J].Engineering Structures, 2005, 27(4):535-548.
[9] Chen Changsong, Tian Zhongchu, Zheng Wangan.A study on the modal experiment technique of long-space cable-stayed bridge [J].China Civil Engineering Journal, 2005, 38(10):72-75.(in Chinese)

Memo

Memo:

Biographies: Li Zhijun(1978—), male, graduate; Li Aiqun(corresponding author), male, doctor, professor, aiqunli@seu.edu.cn.
Foundation item: The National High Technology Research and Development Program of China(863 Program)(No.2006AA04Z416).
Citation: Li Zhijun, Li Aiqun, Han Xiaolin.Operational modal identification of suspension bridge based on structural health monitoring system[J].Journal of Southeast University(English Edition), 2009, 25(1):104-107.

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