Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (1): 225-232.doi: 10.13229/j.cnki.jdxbgxb20200451

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Analysis of free vibration characteristics of cracked box girder bridge based on finite element method

Qing-wen KONG1(),Guo-jin TAN1,Long-lin WANG2(),Yong WANG3,Zhi-gang WEI4,Han-bing LIU1   

  1. 1.College of Transportation，Jilin University，Changchun 130022，China
    2.Guangxi Transportation Science and Technology Group Co. ，Ltd. ，Nanning 530007，China
    3.Jilin Provincial Highway Administration，Changchun 130021，China
    4.Jilin Provincial High Class Highway Construction Bureau，Changchun 130033，China
  • Received:2020-05-06 Online:2021-01-01 Published:2021-01-20
  • Contact: Long-lin WANG E-mail:kongqw18@mails.jlu.edu.cn;wangll18577888161@gmail.com

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Abstract:

The free vibration characteristics of cracked box girder bridges were analyzed in this paper. Firstly， the additional flexibility matrices of box girder in the cases of deep crack and shallow crack were derived based on the basic principle of local flexibility formation， and the stiffness matrix of cracked beam element was obtained， and then the free vibration characteristic analysis method of cracked box girder bridge based on finite element method was formed. Next， the dynamic characteristics of the cracked cantilever steel beam were tested， and the experimental results were compared with the natural frequency calculation results to verify the accuracy and reliability of the proposed method. Finally， the numerical analysis of continuous reinforced concrete box girder was carried out， and the influence of crack location， depth and number on the natural frequency of box girder bridge and the influence of crack on vibration mode were analyzed.

Key words: bridge engineering, box section beam bridge, crack, free vibration characteristics

CLC Number: 

  • U446

Fig.1

Cracked beam element"

Fig.2

Box cross section with cracks"

Fig.3

Geometric dimensions of cantilever steel beam"

Fig.4

Box section beam test site"

Fig.5

Change rate of the first second order natural frequency of steel cantilever beam"

Fig.6

Bridge elevation (unit: cm)"

Fig.7

Cross section of bridge (unit: cm)"

Fig.8

Change rate of the first two-order natural frequency of the steel cantilever beam"

Fig.9

Change rate of the first two-order natural frequency of continuous box girder bridge"

Fig.10

The first two-order mode shape of continuous box girder bridge"

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