International Journal of Steel Structures

, Volume 18, Issue 4, pp 1284–1296 | Cite as

Prediction of Bending Fatigue Life of Cracked Out-of-Plane Gusset Joint Repaired by CFRP Plates

  • Risa MatsumotoEmail author
  • Takafumi Komoto
  • Toshiyuki Ishikawa
  • Atsushi Hattori
  • Hirotaka Kawano


Carbon fiber reinforced polymer (CFRP), plates bonding repair method is one of the simple repair methods for cracked steel structures. In this study, the influence of width of CFRP plates on bending fatigue life of out-of-plane gusset joint strengthened with CFRP plates was investigated from the experimental and numerical point of view. In the bending fatigue test of cracked out-of-plane gusset joint strengthened with CFRP plates, the effect of width of CFRP plates on crack growth life was clarified experimentally. Namely, it was revealed that the crack growth life becomes larger with increasing the width of CFRP plates. In the numerical approach, the stress intensity factor (SIF) at the surface point of a semi-elliptical surface crack was estimated based on the linear fracture mechanics. Furthermore, the extended fatigue life of cracked out-of-plane gusset joint strengthened with CFRP plates was evaluated by using the estimated SIF at the surface point and the empirical formula of the aspect ratio of semi-elliptical crack. As the results of numerical analysis, the estimated fatigue life of the specimen strengthened with CFRP plates showed the good agreement with the test results.


CFRP plate Out-of-plane gusset joint Bending moment Stress intensity factor Linear fracture mechanics 


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Copyright information

© Korean Society of Steel Construction 2018

Authors and Affiliations

  • Risa Matsumoto
    • 1
    Email author
  • Takafumi Komoto
    • 2
  • Toshiyuki Ishikawa
    • 3
  • Atsushi Hattori
    • 1
  • Hirotaka Kawano
    • 1
  1. 1.Department of Urban ManagementKyoto UniversityKyotoJapan
  2. 2.Metropolitan Expressway CompanyTokyoJapan
  3. 3.Department of Civil, Environmental, and Applied System EngineeringKansai UniversityOsakaJapan

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