Advanced Steel Construction

Vol. 15, No. 3, pp. 232-241 (2019)


 FATIGUE REPAIRING CRAFTSMANSHIP OF DECK-TO-VERTICAL

STIFFENER WELD IN THE STEEL BRIDGE DECK

 

Yi-xun Wang 1, Bo-hai Ji 1, *, Zhong-qiu Fu 1 and Yue Yao 1

1 School of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

* (Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 22 April 2018; Revised: 9 September 2018; Accepted: 28 October 2018

 

DOI:10.18057/IJASC.2019.15.3.3

 

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ABSTRACT

Experiments and FE analysis were conducted on the fatigue repairing techniques of deck-to-vertical stiffener weld in the steel bridge deck. The steel bridge deck was modeled to analyze cracking reason of deck-to-vertical stiffener weld. The fatigue repairing experiment was carried out on three repairing techniques. The fatigue life and stress distribution of the deck-to-vertical stiffener weld were analyzed and repairing effects were compared. Repairing craftsmanship with different parameters was modeled to study change of stress distribution. Besides, influence of welding residual stress, stop-hole and CFRP reinforcement on fatigue repairing was discussed. The results showed that cracks of welding end on the deck were induced by out of plane deformation while those on the vertical stiffener were caused by combined out-of-plane and inplane deformation, which was more prone to cracking. Residual tensile stress reached yield strength of steel after re - welding, thus hammering and polishing after re-welding could improve fatigue life of the weld. The re-welding techniques had more favorable repairing effects than stop-hole and CFRP reinforcement.

 

KEYWORDS

Steel bridge deck, Vertical stiffener, Fatigue crack, Cracking reason, Repairing techniques


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