Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Prediction of steel corrosion in magnesium cement concrete based on two dimensional Copula function

  • Feng, Qiong (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology) ;
  • Qiao, Hongxia (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology) ;
  • Wang, Penghui (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology) ;
  • Gong, Wei (Department of Civil Engineering,Nanjing University of Aeronautic and Astronautic)
  • Received : 2017.05.05
  • Accepted : 2017.10.19
  • Published : 2018.02.25
⟨ Previous Next ⟩

Abstract

In order to solve the life prediction problem of damaged coating steel bar in magnesium cement concrete, this study tries to establish the marginal distribution function by using the corrosion current density as a single degradation factor. Representing the degree of steel corrosion, the corrosion current density were tested in electrochemical workstation. Then based on the Copula function, the joint distribution function of the damaged coating was established. Therefore, it is indicated that the corrosion current density of the bare steel and coated steel bar can be used as the boundary element to establish the marginal distribution function. By using the Frank-Copula function of Copula Archimedean function family, the joint distribution function of the damaged coating steel bar was successfully established. Finally, the life of the damaged coating steel bar has been lost in 7320d. As a new method for the corrosion of steel bar under the multi-dimensional factors, the two-dimensional Copula function has certain practical significance by putting forward some new ideas.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, National Natural Science Foundation of Gansu

References

  1. Anoop, M.B., Rao, K.B. and Raghuprasad, B.K. (2016), "Performance-based remaining life assessment of reinforced concrete bridge girders", Comput. Concrete, 18(1), 69-97. https://doi.org/10.12989/cac.2016.18.1.069
  2. Cao, Y., Chang, W., Wang, X. and Zuo, W. (2004), "Research and development of magnesite products and modifying technique", Fiber Reinf. Plast. Compos., 5, 46-48.
  3. Department of Civil Engineering and Architecture, Chinese Academy of Engineering (2004), Durability Design and Construction Guide for Concrete Structures, China Architecture & Building Press, Beijing, China.
  4. Hu, Q. (2013), "The selection of copula function and its application in the dual degradation model", Master Thesis, East China Normal University, China.
  5. Li, Q. (2012), "The study of financial market risk measurement based on Copula theory and GPD model", Master Thesis, Chongqing University, China.
  6. Luo, G. and Shi, Y. (2002), "Review of non-destructive methods in assessment corrosion in reinforced concrete member", Fujian Arch. Construct., 8(4), 55-57.
  7. Ma, H., Guan, B., Wang, Y., Yu, Y., Liu, K. and Zhang, J. (2015), "Research progress of magnesium oxychloride cement gelled material", Mater. Rev., 29(15), 103-107.
  8. Qiao, H., Zhu, B., Feng, Q. and Lu, C. (2017), "Accelerated life testing of concrete based on stochastic approach and assessment", Comput. Concrete, 12(1), 111-120.
  9. She, X. (2016), "Research on financial market dependence modeling and risk measures: An analysis based on the GARCHEVT-Vine Copula model", Ph.D. Dissertation, East China Normal University, China.
  10. Tian, H. and Li, F.Y. (2016), "Probabilistic-based prediction of lifetime performance of RC bridges subject to maintenance interventions", Comput. Concrete, 17(4), 499-521. https://doi.org/10.12989/cac.2016.17.4.499
  11. Wang, B. (2012), "Failure mechanism and degradation model of RC structure corroded by Chloride attack", Ph.D. Dissertation, China University of Mining and Technology, China.
  12. Wang, L. (2011), "The research on estimation of distribution algorithm based on Copula theory", Ph.D. Dissertation, Lanzhou University of Technology, China.
  13. Wen, J., Yu, H., Wu, C., Li, Y., Dong, D. and Zheng, L. (2013), "Hydration Kinetic and influencing parameters in hydration process of magnesium oxychloride cement", J. Chin. Ceram. Soc., 41(5), 588-596.
  14. Wen, L. (2010), "Origin and distribution characteristics of saline soil in China", Ph.D. Dissertation, HeFei University of Technology, China.
  15. Xu, Y. (1993), Saline Soil Foundation, China Architecture & Building Press, Beijing, China.
  16. Yang, X.M., Liu, B.D. and Li, J. (2007), "Correlation analysis of the Shanghai-Shenzhen stock index based on Gaussian Copula and t-Copula", J. Shandong Univ., 42(12), 63-68.
  17. Yao, L., Zhang, L.L., Zhang, L. and Li, X.L. (2015), "Prediction of initiation time of corrosion in RC using meshless methods", Comput. Concrete, 16(5), 669-682. https://doi.org/10.12989/cac.2015.16.5.669
  18. Yi, W. (2011), Dependent Structure Model of Financial Risk and its Application based on Copula Theory, China Economic Publishing House, Beijing, China.
  19. Zhang, C.M., Yang, H.J. and Ma, X.J. (2014), "Research progress of magnesium oxychloride cement", Bull. Chin. Ceram. Soc., 33(1), 117-121.
  20. Zheng, H. (2009), "Randomness of Chloride ion erosion in concrete and service life prediction under natural environment", Master Thesis, Zhejiang University of Technology, China.