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首页> 外文期刊>International journal of steel structures >Development of Fatigue Test Method and Improvement of Fatigue Life by New Functional Steel Plates for Welding of Trough Rib and Deck Plate of Orthotropic Decks
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Development of Fatigue Test Method and Improvement of Fatigue Life by New Functional Steel Plates for Welding of Trough Rib and Deck Plate of Orthotropic Decks

机译：正交各向异性甲板槽形肋板和甲板板焊接用新型功能钢板的疲劳试验方法的发展及疲劳寿命的提高

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摘要

Under heavy traffic conditions, some fatigue cracks have been found at welding joints between U-shaped ribs "trough ribs" and deck plates. Fatigue cracks along thickness direction of deck plate from root tip are important because visual crack detection from outside is limited. In this paper, new functional steel plates with initiation resistance of fatigue crack at weldment and propagation resistance at base material are applied to deck plate to evaluate improvement of fatigue life. We conducted fixed-point fatigue tests with real scale partial models consisted with one trough rib and a transverse girder, and the elastic FEM (Finite Element Method) analysis corresponding to the fatigue test specimen. Based on these results, we studied the fatigue properties which focused on the difference between conventional steel plates and newly developed steel plates, FCA (Fatigue Crack Arrester). Fatigue cracks were initiated from root tip of welded joints between a trough rib and a deck plate. It is clarified that FCA steel plates instead of conventional steel plates can improve the fatigue life under the same welding conditions. This improvement effect becomes much clearer in the high cycle region, which is noticeable at the operation and management stage of bridges.
机译：在繁忙的交通条件下，在U形肋“槽肋”和盖板之间的焊接接头处发现了一些疲劳裂纹。从根尖开始沿着甲板厚度方向的疲劳裂纹很重要，因为从外部视觉裂纹的检测受到限制。在本文中，将具有焊接时疲劳裂纹萌生抵抗力和母材传播阻力的新型功能钢板应用于甲板，以评估疲劳寿命的改善。我们使用由一个槽形筋和一个横梁组成的真实比例局部模型进行了定点疲劳试验，并根据疲劳试验样本进行了弹性有限元分析。基于这些结果，我们研究了疲劳性能，该疲劳性能集中于常规钢板和新开发的钢板FCA（疲劳裂纹避雷器）之间的差异。疲劳裂纹是由槽形肋和盖板之间的焊接接头的根尖引起的。需要说明的是，在相同的焊接条件下，FCA钢板代替传统钢板可以提高疲劳寿命。这种改善效果在高循环区域变得更加明显，这在桥梁的运营和管理阶段就很明显。

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