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RESEARCH PAPER
Time-dependent reliability analysis of corroded RC beams based on the phase-type fitting method
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Zijun Wu 1,2
 
 
 
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1
Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, China
 
2
School of Mechanical Engineering and Automation, Wuhan Textile University, China
 
3
Department of Mechanics, Huazhong University of Science and Technology, China
 
4
Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, Huazhong University of Science and Technology, China
 
 
Submission date: 2023-07-26
 
 
Final revision date: 2023-08-24
 
 
Acceptance date: 2023-09-17
 
 
Online publication date: 2023-09-18
 
 
Corresponding author
Zijun Wu   

Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, 430200, Wuhan, China
 
 
Eksploatacja i Niezawodność – Maintenance and Reliability 2023;25(4):172442
 
HIGHLIGHTS
  • A novel phase-type (PH) fitting method is developed for time-dependent reliability.
  • A reliability model of reinforced concrete beams is formulated by considering the timedependent chloride diffusion coefficient.
  • A new strategy is incorporated with Expectation Maximization algorithm to simply, efficiently and scientifically obtain the parameters of the PH method.
  • The proposed method shows excellent computational efficiency and accuracy.
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ABSTRACT
It remains an important challenge to quantitatively describe the corrosion of reinforced concrete (RC) structures under chloride penetration. When considering the uncertainties encountered throughout the life cycle of RC structures exposed to a corrosive environment and evaluating their safety and reliability, the complexity of the problem intensifies. To address these issues, this paper focuses on the time-dependent reliability analysis of corroded RC beams, utilizing the phase-type (PH) fitting method. Initially, a model for the time-dependent reliability of corroded RC beams is established, incorporating the time-dependent chloride diffusion coefficient. Subsequently, a novel PH fitting method is proposed. The effectiveness of this new method is demonstrated through numerical examples. Furthermore, the time-dependent reliability analysis of corroded RC beams is compared using both the PH fitting method and the Monte Carlo simulation. The results reveal that the proposed method can accurately and efficiently deal with time-dependent reliability problems.
ACKNOWLEDGEMENTS
This work is supported by the National Natural Science Foundation of China (nos. 52275266, 11832013 and 11572134), Hubei Provincial Department of Education Science and Technology Research Project (no. Q20221714), and the Opening Foundation of Hub ei Key Laboratory of Digital Textile Equipment (no. DTL2022012). The authors sincerely thank the editor and anonymous reviewers for the constructive comments on this paper.
 
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eISSN:2956-3860
ISSN:1507-2711
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