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Investigation of fatigue performance of welded details in long-span steel bridges using long-term monitoring strain data

机译：使用长期监测应变数据调查长跨度钢结构焊接细节的疲劳性能

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Monitoring strain data provides possibilities for the fatigue assessment of the critical components in real structures under the operational conditions. This paper presents a case study on the investigation of fatigue performance of welded details. Long-term monitoring strain data of 4years between 2006 and 2009 collected by the structural health monitoring system mounted on the Runyang Suspension Bridge and Runyang Cable-stayed Bridge are utilized. The study focuses on two aspects: (i) the effects of different strain components in the raw strain data on the fatigue damage assessment and (ii) the necessity of long-term strain measurement for fatigue evaluation. The results indicate that temperature effect on the stress range spectrum is negligible. The enormous low-level stress cycles caused by random interference would result in erroneous equivalent stress ranges and number of cycles, and thus should be eliminated from the stress range spectrum. Through in-depth analysis of monitoring strain data in three special months and in 3years, respectively, it is revealed that short-term data monitored in a few days and medium-term data monitored in a few months are not adequate enough to reveal the actual fatigue behaviors of steel bridges and would give inaccurate fatigue life prediction. Finally, the fatigue life predictions of two types of welded details by considering traffic flow growth are carried out. Lessons learned from the long-term monitoring are expected to enhance our understanding in fatigue performances of steel bridges. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：监测应变数据提供了在操作条件下实际结构中的关键组分的疲劳评估的可能性。本文提出了焊接细节疲劳性能调查的案例研究。利用安装在润阳悬架桥和伦阳斜拉桥上的结构健康监测系统收集的2006年和2009年的4年间的长期监测应变数据。该研究侧重于两个方面：（i）不同应变成分在疲劳损伤评估的原始应变数据中的影响和（ii）疲劳评价的长期应变测量的必要性。结果表明对应力范围谱的温度效应可忽略不计。由随机干扰引起的巨大的低水平应力循环将导致错误的等效应力范围和循环次数，因此应从应力范围谱消除。通过深入分析三个特殊月份和3年的应变数据，分别揭示了几天内监测的短期数据，在几个月内监测的中期数据不足以揭示实际的钢结构的疲劳行为，并会产生不准确的疲劳寿命预测。最后，通过考虑交通流量增长，执行两种类型的焊接细节的疲劳寿命预测。预计从长期监测中汲取的经验教训将加强我们对钢结构​​疲劳性能的理解。版权所有（c）2015 John Wiley＆Sons，Ltd。

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