Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (6): 113-118,125.doi: 10.3969/j.issn.1000-565X.2011.06.020

• Architecture & Civil Engineering • Previous Articles     Next Articles

Modal Parameter Identification and Model Analysis of Grand Double-Deck Highway Bridge

Wang Rong-hui1,2  Cai Lu-rong1  Huang Yong-hui1  Chen Kong-liang1   

  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
  • Received:2010-04-28 Revised:2011-01-11 Online:2011-06-25 Published:2011-05-06
  • Contact: 王荣辉(1959-) ，男，教授，博士生导师，主要从事桥梁结构计算理论及试验研究． E-mail:rhwang2005@ yahoo.com.cn
  • About author:王荣辉(1959-) ，男，教授，博士生导师，主要从事桥梁结构计算理论及试验研究．
  • Supported by:

    国家自然科学基金资助项目( 50978105) ; 广东省交通厅科技项目( 2007-15)

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Abstract:

Dongjiang Bridge is the first double-deck and three-main-truss steel bridge stiffened with rigid suspension in China. In order to determine the modal parameters and obtain a theoretical model of the whole bridge,a modal test based on ambient excitation was carried out before the open to traffic. Then,the vertical,horizontal and torsional modal parameters of the bridge were obtained by means of the frequency-domain identification method. Finally,a comparison was performed between the test results and the results calculated by the 3D finite element method. It is indicated that ( 1) the three-main-truss steel bridge is of strong integral bearing capacity; ( 2) the contribution of the precast bolting deck to the integral stiffness of the bridge is non-neglectable; ( 3) the model with rigid beamplate connections well describes the joint connection of the whole bridge,and the corresponding calculated intrinsic vibration mode accords well with the tested ones; and ( 4) due to the deficiency in considering the integral joint stiffness of the bridge,the theoretical vibration frequencies are slightly lower than the tested ones,with a first fourorder frequency difference being less than 4%.

Key words: modal parameter, double-deck highway bridge, ambient excitation, rigid suspension