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Development of a Fatigue Life Assessment Model for Pairing Fatigue Damage Prognoses with Bridge Management Systems

机译：桥梁管理系统配对疲劳损伤预测的疲劳寿命评估模型的发展

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Fatigue damage is one of the primary safety concerns for steel bridges reaching the end of their design life. Currently, federal requirements mandate regular inspection of steel bridges for fatigue cracks with evaluative reporting to bridge management systems. The quality of the inspection is subjective and time delayed due to inspection cycles, which are scheduled for every two years. However, structural health monitoring (SHM) data collected between inspection-intervals can provide supplementary information on structural condition that ameliorates some drawbacks of current inspection methods. Through the use of SHM and finite element models, fatigue performance assessments can be utilized throughout the service life of fatigue sensitive bridge elements for mitigating fatigue damage and preventing sudden fatigue failure. These assessments will additionally be useful to inspectors when reporting bridge condition evaluations to bridge management systems.The main goal of this study is to develop a fatigue life assessment method used for determining the remaining useful life of steel bridges and to map these results to existing bridge management systems. In order to achieve this goal, the current practices and methodologies associated with fatigue life of bridge elements and the use of bridge management systems are investigated.For analyses of fatigue damage, the fatigue life is split into two different periods of analyses: a crack initiation period and crack growth period. In order to quantify the effects of fatigue damage, each period of the fatigue life is associated with a unique assessment method, an empirical correlation assessment and a fracture mechanics assessment. Structural health monitoring techniques are employed to monitor the behavior of the bridge components and bridge elements. These two assessment methods are combined to form a damage accumulation model to estimate the fatigue life. The proposed damage accumulation model uses the acquired data from structural health monitoring alongside finite element modeling to derive a damage prognosis of bridge elements. The damage prognosis attempts to forecast the structure's performance by measuring the cumulative fatigue damage, estimating future loads, and ultimately determining the remaining useful life of the bridge element. A technique for mapping the results of the damage prognosis into condition state classifications is proposed.The suitability and applicability of the proposed damage accumulation model is illustrated on an existing highway bridge. This bridge was selected as a good candidate for fatigue monitoring due to the average daily truck traffic and the identification of existing and active fatigue cracks. The application of the damage accumulation model is demonstrated and a damage prognosis is derived. Finally, the damage accumulation results are integrated with current condition state classifications used in bridge management systems.
机译：疲劳损坏是钢结构达到其设计生活结束的主要安全问题之一。目前，联邦要求授权定期检查钢结构对桥梁管理系统的评价报告的疲劳裂缝。检查的质量是由于检查周期而延迟的主观性，每两年安排每两年。然而，在检查间隔之间收集的结构健康监测（SHM）数据可以提供关于结构条件的补充信息，这些信息可以改善电流检测方法的一些缺点。通过使用SHM和有限元模型，可以在整个疲劳敏感桥元件的使用寿命中使用疲劳性能评估，以减轻疲劳损伤并防止突然疲劳失效。当报告桥接条件评估到桥接管理系统时，这些评估将对检查员有用。本研究的主要目标是开发一种用于确定钢结构剩余使用寿命的疲劳寿命评估方法，并将这些结果映射到现有的桥梁管理系统。为了实现这一目标，研究了与桥接元件的疲劳寿命相关的当前实践和方法以及桥梁管理系统的使用。分析疲劳损伤，疲劳寿命分为两次不同的分析时期：裂纹启动期间和裂缝增长期。为了量化疲劳损伤的影响，疲劳寿命的每个时期与独特的评估方法相关，经验相关评估和骨折力学评估。采用结构健康监测技术来监测桥梁部件和桥接元件的行为。将这两种评估方法组合以形成损伤累积模型以估计疲劳寿命。所提出的损坏累积模型使用来自结构健康监测的所获取的数据以及有限元模型，从而导出桥接元件的损伤预后。损害预后试图通过测量累积疲劳损坏，估算未来载荷以及最终确定桥接元件的剩余使用寿命来预测结构的性能。提出了一种将损伤预后的结果进行映射到病态状态分类。所提出的损坏积累模型的适用性和适用性在现有的公路桥上说明了。由于平均每日卡车交通和现有和有源疲劳裂缝的鉴定，这座桥被选为疲劳监测的良好候选者。证明了损伤累积模型的应用，衍生损伤预后。最后，损坏累积结果与桥接管理系统中使用的当前条件状态分类集成。

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