Remaining Fatigue Strength of an Orthotropic Steel Deck with Respect to a Repair Method by Cold Joining Techniques

ce/papers Pub Date : 2024-09-11 DOI:10.1002/cepa.3079
Florian Kalkowsky, Markus Schröder, Christoph Blunk, Ralf Glienke, Jörg Alex, Wilko Flügge
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Abstract

The increased traffic loads of the last decades led to an overload of the existing infrastructure. Especially for orthotropic steel decks of bridges, which are prone to fatigue fractures, this have led to structural damages of different categories. With respect to category 2 damages and their retrofit, this paper presents results of fatigue tests on the nonwelded constructional details of an old, demolished orthotropic steel deck. The samples were extracted from a highway bridge with an orthotropic steel deck built in Germany in the 1970s. In comparative fatigue tests on identical constructional details made of new material with the same steel grade, the remaining fatigue strength was determined. Based on the problem of manganese sulfides in old steels the potential of the repair method by cold joining techniques was emphasized. Characteristic load-bearing capacities for a Eurocode 3-compliant design of a structural blind fastener were determined and their use in a pilot project was reported.

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用冷接合技术修复正交异性钢甲板的剩余疲劳强度
过去几十年来,交通负荷的增加导致现有基础设施超负荷运转。特别是对于容易发生疲劳断裂的正交异性钢桥面,这导致了不同类别的结构损坏。关于第二类损坏及其改造,本文介绍了对已拆除的旧正交异性钢桥面非焊接结构细节的疲劳测试结果。样本取自德国上世纪七十年代建造的一座正交异性钢桥面的公路桥。在对相同钢级新材料制成的相同结构细节进行的对比疲劳试验中,确定了剩余疲劳强度。根据旧钢材中的锰硫化物问题,强调了冷连接技术修复方法的潜力。确定了符合欧洲规范 3 的结构盲孔紧固件设计的承载能力特征,并报告了其在试点项目中的应用。
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