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首页> 外文期刊>International Journal of Fatigue >Fatigue life prediction for parallel-wire stay cables considering corrosion effects
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Fatigue life prediction for parallel-wire stay cables considering corrosion effects

机译：考虑腐蚀影响的平行线斜拉索的疲劳寿命预测

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摘要

Corrosion in stay cables of long-span cable-stayed bridges is a severe problem. This paper studies the quantitative influences of corrosion on fatigue life for parallel-wire stay cables. First, accelerated corrosion tests were conducted using acetic acid salt spray (AASS) for exposure periods from 1 d to 60 d; subsequently, a multi-parameter Weibull model for corrosion-stress-life (C-S-N) is employed to describe the influence of corrosion on fatigue life of such steel wires. Fatigue damage evolution models of multi-step loading are then used to establish recursion formulas for the probabilistic character of the fatigue life of parallel-wire stay cables. Monte Carlo simulation (MCS) is conducted to simulate the fatigue life of the stay cable, assuming load redistribution after the failure of each wire. Results indicate that the fraction of wires with short fatigue lives dominates the fatigue life of stay cable. Corrosion effects on fatigue life for both steel wire and stay cables are nearly the same. Although the variance of fatigue life of stay cable is much smaller than that of the steel wire, the fatigue performance of the stay cable becomes stable. The fatigue life of stay cable decreases significantly, as the corrosion degree of the steel wire increases, especially, in the lower stress ranges. Therefore, to prevent premature fatigue failures of parallel-wire stay cables, avoiding corrosion in the steel wires during the in-service period is crucial.
机译：大跨度斜拉桥的斜拉索腐蚀是一个严重的问题。本文研究了腐蚀对平行线斜拉索疲劳寿命的定量影响。首先，使用乙酸盐雾（AASS）进行从1 d到60 d的暴露时间的加速腐蚀测试；随后，采用腐蚀-应力-寿命的多参数威布尔模型（C-S-N）描述腐蚀对此类钢丝疲劳寿命的影响。然后，采用多步加载的疲劳损伤演化模型为平行线斜拉索的疲劳寿命概率特征建立递推公式。进行蒙特卡洛模拟（MCS）以模拟斜拉索的疲劳寿命，假设每根导线失效后负载会重新分配。结果表明，疲劳寿命短的电线占主导地位的斜拉索的疲劳寿命。腐蚀对钢丝和斜拉索的疲劳寿命几乎相同。尽管拉索的疲劳寿命的变化远小于钢丝的疲劳寿命的方差，但是拉索的疲劳性能变得稳定。随着钢丝的腐蚀程度增加，尤其是在较低的应力范围内，斜拉索的疲劳寿命显着降低。因此，为了防止平行线斜拉索过早疲劳失效，在使用期间避免钢丝腐蚀是至关重要的。

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  • 来源
    《International Journal of Fatigue》 |2018年第9期|81-91|共11页
  • 作者

    Chengming Lan; Yang Xu; Caiping Liu; Hui Li; B.F. Spencer;

  • 作者单位

    School of Civil and Resource Engineering, University of Science & Technology Beijing,Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign;

    Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, School of Civil Engineering, Harbin Institute of Technology;

    School of Civil and Resource Engineering, University of Science & Technology Beijing;

    Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, School of Civil Engineering, Harbin Institute of Technology;

    Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fatigue life; Corrosion; Weibull model; Monte Carlo simulation; Parallel-wire stay cable;

    机译：疲劳寿命腐蚀魏布尔模型蒙特卡罗模拟平行拉索;

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