Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (9): 41-47,53.doi: 10.3969/j.issn.1000-565X.2011.09.008

• Architecture & Civil Engineering • Previous Articles     Next Articles

Modal Parameter Identification of Cable-Stayed Bridge Based on Multiple Reference DOFs Stabilization Diagram

Ye Xi-jun1  Yan Quan-sheng1,2  Wang Wei-feng1  Li Jian3   

  1. 1. School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China; 2. State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China; 3. College of Environmental Engineering,University of Illinois at Urbana-Champaign,Champaign 61801,USA
  • Received:2011-03-28 Revised:2011-06-24 Online:2011-09-25 Published:2011-08-02
  • Contact: 叶锡钧(1984-) ，男，博士生，主要从事结构健康监测研究． E-mail:xijunye.scut@gmail.com
  • About author:叶锡钧(1984-) ，男，博士生，主要从事结构健康监测研究．
  • Supported by:

    广东省交通运输厅科技项目( 2010-02-015)

PDF

1686

Abstract:

As it is easy for the operational modal analysis with unkown excitation to miss true modes and produce spurious modes,an improved multiple reference degrees of freedom( DOFs) stabilization diagram algorithm is proposed based on eigensystem realization algorithm. In this algorithm,by setting different reference DOFs in each group of data,the modal parameters are identified by means of the natural excitation technique in junction with the eigensystem realization algorithm. Then,the most accurate modal parameters are determined with damping ratio,observability matrix-based consistent mode indicator and modal amplitude coherence as the identification indexes. Finally,the proposed algorithm and the enhanced frequency domain decomposition method are both evaluated by means of the modal identification of the measured data of a long-span cable-stayed bridge,the Yamen Bridge. The results show that the proposed algorithm is capable of accurately identifying the low modes,thus providing a good basis for finite element model updating.

Key words: cable-stayed bridge, operational modal analysis, multiple reference DOFs stabilization diagram, natural excitation technique, eigensystem realization algorithm, enhanced frequency domain decomposition

CLC Number: