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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 9    September 2019

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Effect of crack-closure treatment on fatigue durability of cracked rib-to-deck welded joints in steel bridge decks
WANG Qiu-dong(王秋东), JI Bo-hai(吉伯海), FU Zhong-qiu(傅中秋), YE Zhi(叶枝)

College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Abstract:To evaluate the effect of treating long cracks with the impact crack-closure retrofit (ICR) technique, three rib-to-deck welded specimens with a crack length of about 100 mm were tested. The metallographic structure, crack section, crack propagation life, and stress variation were analyzed. Finite-element models were also developed, and some optimal values of certain parameters are suggested according to the simulated results. The results show that new crack sources are generated on both sides of the ICR-treated region because of the stress distribution. The fatigue lives of cracked specimens with long cracks are significantly improved by the technique. Considerable residual compressive stress is also induced, and so it is suggested that the optimal impact angle to be applied to real bridges should be 70°. The stress at the weld root is distributed uniformly with the crack closed, and the optimal crack-closure depth is 4 mm. To evaluate the effect of different crack-closure depths in tests, it is recommended that a hot-spot stress method which is extrapolated by three reference points should be adopted.

 

Key words: steel bridge deck; fatigue durability; impact crack-closure retrofit technique; fatigue life; stress distribution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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