Evaluation of Fatigue Crack Growth Behavior and Effect of Repair Work Based on Thermoelastic Stress Analysis for Steel Bridge Members
Evaluation of Fatigue Crack Growth Behavior and Effect of Repair Work Based on Thermoelastic Stress Analysis for Steel Bridge Members
复制标题
基于热弹性应力分析的钢桥构件疲劳裂纹扩展行为和修复效果评价
DOI：
10.1007/978-3-030-30098-2_18
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Hayashi
中科院分区：
文献类型：
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作者：
T. Sakagami;D. Shiozawa;Y. Terauchi;N. Arima;Y. Mizokami;M. Hayashi
疲劳损伤扩展的评估是保证钢桥安全和评估老化钢桥剩余寿命的必要条件。在这项研究中，热弹性应力分析（TSA）应用于现场测量疲劳裂纹周围的应力分布，并通过断裂力学方法估计未来的裂纹扩展行为。对钢桥焊接结构的部分模型试件进行了试验研究。应力强度因子由TSA技术测得的应力分布计算。此外，TSA技术被应用于评估缺陷部分的修复工程的有效性。TSA确认了实际钢桥构件处理后疲劳裂纹周围应力分布的严重降低。
Evaluation of fatigue damage propagation is necessary to ensure safety and to estimate the remaining life of the aging steel bridges. In this study, thermoelastic stress analysis (TSA) was applied for on-site measurement of stress distributions around fatigue cracks, and the future crack propagation behavior was estimated by the fracture mechanics approach. Experimental studies were conducted for laboratory specimens which modeled a part of welded structure in steel bridges. The stress intensity factors were calculated from stress distributions measured by TSA technique. Further TSA technique was applied to evaluate the effectiveness of repair works for defective portions. Severity reduction in stress distribution around the fatigue crack after treatment was confirmed for actual steel bridge members by TSA.