International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
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Fatigue Strength and Root-Deck Crack Propagation for U-Rib to Deck Welded Joint in Steel Box Girder

  • Zhiyuan, YuanZhou (College of Civil and Transportation Engineering, Hohai University) ;
  • Bohai, Ji (College of Civil and Transportation Engineering, Hohai University) ;
  • Di, Li (College of Civil and Transportation Engineering, Hohai University) ;
  • Zhongqiu, Fu (College of Civil and Transportation Engineering, Hohai University)
  • Received : 2017.11.06
  • Accepted : 2018.03.28
  • Published : 2018.12.31
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Abstract

Fatigue tests and numerical analysis were carried out to evaluate the fatigue performance at the U-rib to deck welded joint in steel box girder. Twenty specimens were tested corresponding to different penetration rates (80 and 100%) under fatigue bending load, and the fatigue strength was investigated based on hot spot stress (HSS) method. The detailed stress distribution at U-rib to deck welded joint was analyzed by the finite element method, as well as the stress intensity factor of weld root. The test results show that the specimens with fully penetration rate have longer crack propagation life due to the welding geometry, resulting in higher fatigue failure strength. The classification of FAT-90 is reasonable for evaluating fatigue strength by HSS method. The penetration rate has effect on crack propagation angle near the surface, and the 1-mm stress below weld toe and root approves to be more suitable for fatigue stress assessment, because of its high sensitivity to weld geometry than HSS.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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