Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (12): 2883-2891.doi: 10.13229/j.cnki.jdxbgxb20210420

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Pneumatic impact test on rib⁃to⁃diaphragm fatigue crack of steel box girder

Zhi-yuan YUANZHOU(),Bo-hai JI(),Jun-yuan XIA,Tong SUN   

  1. College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China
  • Received:2021-05-11 Online:2022-12-01 Published:2022-12-08
  • Contact: Bo-hai JI E-mail:supery.z@hotmail.com;bhji@hhu.edu.cn

Abstract:

Pneumatic impact technology was used to repair the fatigue crack which initiates from the arc profile of rib-to-diaphragm, and the maintenance effect was evaluated by fatigue test. The bending fatigue tests of 11 specimens were carried out. The fatigue properties and the crack propagation law of the arc profile were discussed. The variation of fatigue crack growth rate and local bearing capacity after pneumatic impact maintenance was analyzed. The maintenance effect of pneumatic impact technology on fatigue crack of rib-to-diaphragm was revealed. The results show that the fatigue strength of the rib-to-diaphragm arc profile is about 46 MPa, which is lower than the recommended value in the Chinese code (JTG D64—2015), under the action of out-of-plane deformation. This kind of fatigue crack is easy to initiate at the weld cover foot, and mainly propagates along the diaphragm base material, showing the characteristics of composite crack propagation. The cracks of all specimens have obvious growth lag after pneumatic impact maintenance, which indicates that the technology has a significant effect on the suppression of fatigue crack growth in this part. The results of more than 4 years engineering application also verify the effectiveness of the proposed method in the fatigue crack repair of rib-to-diaphragm.

Key words: bridge and tunnel engineering, mixed mode crack, pneumatic impact technique, steel box girder, fatigue test

CLC Number: 

  • U443.32

Fig.1

Specimen structure and test point layout"

Fig.2

Fatigue loading and pneumatic impact maintenance"

Table 1

Condition and number of specimens"

组号编号处理方式名义应力幅/MPa
1S80N1不维修80
S80P3~S80P6气动冲击
2S100N2不维修100
S100P7~S100P9气动冲击

Fig.3

Crack propagation life based on Paris formula"

Fig.4

Fatigue crack propagation path"

Fig.5

Fatigue crack growth rate"

Fig.6

S-N curve"

Fig.7

Comparison of expansion rates before and after pneumatic impact maintenance"

Fig.8

Stress of CD2 measuring point of S100P8 before and after maintenance"

Fig.9

Stress at CD4 measuring point before and after maintenance"

Table 2

Number of cycles for crack propagation to 100 mm"

试件编号循环次数N/万次
S100N2102.2
S100P9366.8
S100PS346.6
S100S217.9

Fig.10

Site repair and partial crack history information"

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