Tests on cracked steel plates with different damage levels strengthened by CFRP laminates

Qian Qian Yu, Xiao Ling Zhao, Riadh Al-Mahaidi, Zhi Gang Xiao, Tao Chen, Xiang Lin Gu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)


Strengthening steel structures using carbon fiber reinforced polymer (CFRP) materials has attracted much attention in recent years owing to their potential for fatigue crack repair and their convenience in construction. However, little is known about the efficiency of this strengthening method when applied to steel plates at different crack propagation stages. An experimental study was carried out on notched steel plates strengthened using CFRP laminates. 20 specimens were tested to evaluate the fatigue performance of the strengthened steel plates with emphasis on various degrees of initial damage, simulated by different lengths of slots, including 2%, 10%, 20%, 30% and 40% of the plate width. The effects of the retrofitted configuration and CFRP stiffness were also investigated. The «beach marking» technique and crack propagation gauges were adopted to monitor the fatigue crack propagation. The experimental results were very encouraging, demonstrating that the CFRP patches could effectively slow crack growth and extend fatigue life, regardless of the initial damage levels. More effective strengthening was found by using ultra-high modulus CFRP laminates, covering the initial cracks with CFRP and repairing at an earlier stage (i.e. smaller damage level).

Original languageEnglish
Article number1450018
JournalInternational Journal of Structural Stability and Dynamics
Issue number6
Publication statusPublished - Aug 2014
Externally publishedYes


  • CFRP laminate
  • degree of damage
  • fatigue test
  • steel plate

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Aerospace Engineering
  • Ocean Engineering
  • Mechanical Engineering
  • Applied Mathematics


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