Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (10): 2869-2878.doi: 10.13229/j.cnki.jdxbgxb.20211370

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Transverse mechanical properties of assembled T beam bridge after main girder damage

Chun-liang LI1(),Lei HOU1,Luo-luo ZHAO1,Xiang LIU2,Hong-jun ZHANG3(),Yun-long ZHANG1   

  1. 1.School of Communication Science and Engineering，Jilin Jianzhu University，Changchun 130118，China
    2.The First Construction Co. ，Ltd. of CSCEC 7th Division，Beijing 100162，China
    3.Zhongqing Construction Co. ，Ltd. ，Changchun 130062，China
  • Received:2021-12-15 Online:2023-10-01 Published:2023-12-13
  • Contact: Hong-jun ZHANG E-mail:lichli3300@163.com;550673296@qq.com

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Abstract:

In order to study the variation law of the transverse distribution coefficient of the assembled T beam bridge after any girder damage， based on the rigid-jointed beam method， a transverse mechanical model is established， which is suitable for the different positions and the numbers of girder damage. And the change degree of the transverse distribution coefficient is analyzed with the model. The results show that a transverse unloading occurs after the girder damage. And the larger the girder damage degree is or the more the damaged girders are，the larger the reduction rate of the transverse distribution coefficient of the damaged girder is， while the larger the increasing rate of the transverse distribution coefficient of the intact girder is. And the increasing rate is inversely proportional to the cross range to the damaged girder. In addition， when it is rigid connection between the girders， the transverse unloading capacity and the influence area of the damaged girder are larger than hinged connection between the girders. If the damaged girder is not reinforced in time， the intact girder will be damaged in the order of the closer to the damaged one， the earlier the damage occurs.

Key words: bridge engineering, assembled T beam, main girder damage, transverse distribution coefficients, rigid-connected beam

CLC Number: 

  • U443.3

Fig.1

Force diagram between beams"

Fig.2

Deformation of beams under shear force"

Fig.3

Deformation of beams under moment"

Fig.4

Force diagram between beams when load acts on1# or n# beam"

Fig.5

Force diagram between beams when load acts on s# beam"

Fig.6

Cross section of rigid-connected beam"

Fig.7

Transverse influence lines of pre- and post- 1#beam damage"

Fig.8

Transverse influence lines of pre- and post-2# beam damage"

Fig.9

Transverse influence lines of pre- and post-3# beam damage"

Fig.10

Transverse influence lines of beams of pre- and post-1# beam damage"

Fig.11

Transverse influence lines of beams of pre- and post-3# beam damage"

Fig.12

Transverse distribution coefficients of beams of pre- and post-1# and 2# beams damage"

Fig.13

Transverse distribution coefficients of beams of pre- and post-2# and 3# beams damage"

Fig.14

Transverse distribution coefficients of beams of pre- and post-1# and 3# beams damage"

Fig.15

Transverse distribution coefficients of beams with 1# beam different damages"

Fig.16

Transverse distribution coefficients of beams with 2# beam different damages"

Fig.17

Transverse distribution coefficients of beams with 3# beam different damages"

Fig.18

Transverse distribution coefficients of beamsof pre- and post-1#，2# and 3# beamsseparate damage"

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