Abstract Orthotropic steel decks offer many advantages in bridges, but they are prone to fatigue damage. One of the effective approaches to increase the fatigue resistance is to enhance the stiffness through applying a concrete layer, forming a composite section with the steel deck. However, once the concrete is cracked, the composite action is compromised. To improve the fatigue resistance, this study proposes a composite deck using engineered cementitious composite (ECC) and large U-ribs through experimentation and simulations. Two full-scale composite decks were tested to investigate the fatigue resistance and failure process, and validate a finite element model that was used to elucidate the effect of ECC on the fatigue performance. The test results showed that the composite deck had sufficient fatigue resistance, and the analysis results showed that the ECC overlay reduced the stress range by 90% at the rib-to-deck and diaphragm welded joints and 54% at the rib-to-diaphragm welded joints. One interesting finding is that the proposed deck has a robust fatigue resistance even after damages were caused in the deck system. This study is expected to advance the knowledge of the effect of ECC on the fatigue resistance, understand the underlying mechanisms, and promote further research and potential applications of the proposed composite deck.

中文翻译：

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钢与工程水泥基复合材料正交异性复合桥面板的疲劳性能

摘要 正交异性钢桥面在桥梁中具有诸多优点，但容易发生疲劳破坏。提高抗疲劳性的有效方法之一是通过施加混凝土层来提高刚度，与钢甲板形成复合截面。然而，一旦混凝土开裂，复合作用就会受到影响。为了提高抗疲劳性，本研究通过实验和模拟提出了一种使用工程水泥基复合材料 (ECC) 和大型 U 型肋的复合桥面板。测试了两个全尺寸复合材料甲板，以研究疲劳抗力和失效过程，并验证用于阐明 ECC 对疲劳性能影响的有限元模型。试验结果表明，复合桥面板具有足够的抗疲劳性能，分析结果表明，ECC 堆焊使肋对甲板和隔膜焊接接头的应力范围减小了 90%，在肋对隔膜焊接接头处的应力范围减小了 54%。一个有趣的发现是，即使在甲板系统中造成损坏之后，所提议的甲板仍具有强大的抗疲劳性。这项研究有望推进对 ECC 对疲劳抗力影响的认识，了解潜在的机制，并促进所提出的复合甲板的进一步研究和潜在应用。