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Impact of corrosion on low-cycle fatigue degradation of reinforcing bars with the effect of inelastic buckling

机译:非弹性屈曲作用下腐蚀对钢筋低周疲劳降解的影响

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摘要

The combined effect of inelastic buckling and chloride induced corrosion damage on low-cycle high amplitude fatigue life of embedded reinforcing bars in concrete is investigated experimentally. A total of forty eight low-cycle fatigue tests on corroded reinforcing bars varied in percentage mass loss, strain amplitudes and buckling lengths are conducted. The failure modes and crack propagation are investigated by fractography of fracture surfaces using scanning electron microscope. The results show that the inelastic buckling, percentage mass loss and nonuniform corrosion pattern are the main parameters affecting the low-cycle fatigue life of reinforcing bars. It was found that the fatigue life of corroded reinforcing bars combined with inelastic buckling has a significant path dependency. The results show that in some cases the number of cycles to failure of corroded bars under constant amplitude fatigue test is increased.
机译:实验研究了非弹性屈曲和氯化物引起的腐蚀损伤对埋入式钢筋中低周高幅疲劳寿命的综合影响。在腐蚀的钢筋上进行了总共四十八次低周疲劳试验,这些试验的质量损失百分比,应变幅度和屈曲长度各不相同。使用扫描电子显微镜对断口进行分形,研究了破坏模式和裂纹扩展。结果表明,非弹性屈曲,质量损失百分数和腐蚀方式不均匀是影响钢筋低周疲劳寿命的主要参数。结果发现,锈蚀钢筋与非弹性屈曲相结合的疲劳寿命具有显着的路径依赖性。结果表明,在某些情况下,在恒定振幅疲劳试验下腐蚀钢筋破坏的循环次数增加了。

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