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Computers and Concrete Volume 21, Number 2, February 2018 , pages 181-187 DOI: https://doi.org/10.12989/cac.2018.21.2.181 |
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Prediction of steel corrosion in magnesium cement concrete based on two dimensional Copula function |
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Qiong Feng, Hongxia Qiao, Penghui Wang and Wei Gong
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| 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. | ||
| Key Words | ||
| corrosion current density; marginal distribution function; joint distribution function; Frank-Copula function; life prediction | ||
| Address | ||
| Qiong Feng, Hongxia Qiao, Penghui Wang: Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, 730050 Lanzhou, China Wei Gong: Department of Civil Engineering,Nanjing University of Aeronautic and Astronautic, Nanjing 20016, China | ||