Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (4): 1007-1015.doi: 10.13229/j.cnki.jdxbgxb.20220721

   

Evaluation of mechanical properties of non-uniform corroded rebars based on Monte Carlo method

Yi-fan LIU(),Zhi-wei MIAO(),Chen SHEN,Xiang-dong GENG   

  1. School of Civil Engineering，Southeast University，Nanjing 211189，China
  • Received:2022-06-09 Online:2024-04-01 Published:2024-05-17
  • Contact: Zhi-wei MIAO E-mail:230208109@seu.edu.cn;miaozhiwei@seu.edu.cn

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Abstract:

To enable a reliable analysis of the residual behavior of corroded rebars， a computationally-efficient method capable of considering the corrosion morphology characteristics was proposed by the probability distribution function of the cross-section area. The degraded mechanical properties of rebars under different corrosion rates were quantitatively studied based on the combination of Monte Carlo method and numerical tensile tests of corroded rebars. This method can accurately estimate the mechanical properties of corroded rebars verified with previous test results， especially for the deformation capacity. The effects of constitutive laws and gauge lengths were analyzed respectively. The results show that the strength yield ratio of rebars is the dominant issue governing deformation capacity after being corroded， and different gauge lengths are responsible for the different calculation results of the ultimate strain of corroded rebars.

Key words: structural engineering, Monte Carlo method, non-uniform corrosion, finite element model, mechanical properties

CLC Number: 

  • TU375

Fig.1

Stress-strain curves of notched reinforcement with different pit shape"

Fig.2

Non-uniform corroded rebar diagram"

Fig.3

Modified finite element model"

Fig.4

Load-displacement curves of corroded rebars under different corrosion rates"

Table 1

Average mechanical properties of corroded rebars with 40% corrosion rate under different sample sizes"

样本数量屈服应力/MPa极限应力/MPa极限应变/ε
50185.1253.60.0825
100184.8253.80.0864
200184.7253.80.0870

Fig.5

Degradation curve of mechanical properties ofcorroded rebars"

Fig.6

Curves between true stress， yield stress of rebars and average corrosion rates"

Fig.7

Three different constitutive models for corroded rebars"

Table 2

Ultimate displacement decline rate of cr1， cr2 and cr3 reinforcement"

材料本构40%锈蚀率钢筋极限位移/mm未锈蚀钢筋极限位移/mm极限位移退化率/%
cr10.782.569
cr21.362.546
cr32.785.549

Fig.8

Normalized ultimate strain of rebars with different strength yield ratio"

Fig.9

Degradation law of ultimate strain of corrodedrebars under different gauge length"

Fig.10

Strain cloud diagrams of rebars under differentcorroded length"

Fig.11

Normalized ultimate strain of rebars with different corroded length"

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