Bridge fatigue damage evaluation and updating using non-destructive inspections
Bridge fatigue damage evaluation and updating using non-destructive inspections
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DOI：
10.1016/0013-7944(95)00136-0
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发表时间：
1996-03
影响因子：
5.4
通讯作者：
Zhengwei Zhao;A. Haldar
中科院分区：
文献类型：
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作者：
Zhengwei Zhao;A. Haldar
提出了一种利用无损检测信息来减轻疲劳损伤的方法。尽管疲劳敏感结构的设计有所改进，但行业仍然需要定期进行无损检查。提出了一种基于线弹性断裂力学的可靠性模型，该模型融合了许多不同来源的不确定性，包括无损检测结果中的不确定性。无论是否检测到任何裂纹，每次检查都会提供额外的信息，并且每次检查后都需要更新潜在的疲劳可靠性。更新的可靠性信息可以用作下一步做什么的决策工具，包括是否不采取任何措施、提前重新安排下一次检查，或者立即修复或更换结构。通过示例证明了该方法的应用潜力。结果表明，该方法比当前基于 S−N 曲线的 AASHTO 方法优越得多，可以作为其替代方法。
A method is proposed to mitigate fatigue damage using information from non-destructive inspections. In spite of improvements in the design of fatigue-sensitive structures, periodic non-destructive inspections are still required by the profession. A linear elastic fracture mechanics-based reliability model is proposed which incorporates uncertainties from many different sources, including uncertainty in the results obtained from the non-destructive inspections. Regardless of whether or not it detects any cracks, each inspection provides additional information and the underlying fatigue reliability needs to be updated after each inspection. The updated information on the reliability can be used as a decision making tool as what to do next, in terms of whether to do nothing, reschedule the next inspection at an earlier date, or repair or replace the structure immediately. The application potential of the method is demonstrated with the help of examples. It is shown that the proposed method is much superior to the current S−N curve-based AASHTO method and can be used as an alternative to it.