Structural Monitoring and Maintenance

  • 제6권4호
  • /
  • Pages.291-315
  • /
  • 2019
  • /
  • 2288-6605(pISSN)
  • /
  • 2288-6613(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

An overview of different retrofitting methods for arresting cracks in steel structures

  • Karamloo, Mohammad (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Mazloom, Moosa (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Ghasemi, Ali (Department of Civil Engineering, Shahid Rajaee Teacher Training University)
  • 투고 : 2019.06.04
  • 심사 : 2019.10.31
  • 발행 : 2019.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Fatigue cracks are inevitable in circumstances in which the cyclic loading exists. Therefore, many of mechanical components are in a risk of being in exposure to fatigue cracks. On the other hand, renewing the facilities or infrastructures is not always possible. Therefore, retrofitting the structures by means of the available methods, such as crack arrest methods is logical and in some cases inevitable. In this regard, this paper considers three popular crack arrest methods (e.g., drilling stop-hole, steel welded patch, and carbon fiber reinforced (CFRP) patch), which have been compared by using extended finite element method (XFEM). In addition, effects in terms of the width and thickness of patches and the configuration of drilling stop holes have been evaluated. Test results indicated that among the considered methods, CFRP patches were the most effective means for arresting cracks. Besides, in the case of arresting by means of drilling stop holes, drilling two holes next to the crack-tip was more effective than blunting the crack-tip by drilling one hole. In other words, the results indicated that the use of symmetric welded metal patches could lead to a 21% increase in fatigue life, as compared to symmetric stop holes. Symmetric CFRP patches enhanced the fatigue life of cracked specimen up to 77%, as compared to drilling symmetric stop holes. In addition, in all cases, symmetric configurations were far better than asymmetric ones.

키워드

과제정보

연구 과제 주관 기관 : Shahid Rajaee Teacher Training University

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피인용 문헌

  1. Fracture behavior of monotype and hybrid fiber reinforced self-compacting concrete at different temperatures vol.9, pp.4, 2019, https://doi.org/10.12989/acc.2020.9.4.375