Experimental study on Fe-SMA strengthening technique for cope hole fatigue cracks in orthotropic steel bridge decks

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-19 DOI:10.1016/j.ijfatigue.2025.109003

Zhilin Lyu , Xu Jiang , Xuhong Qiang

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引用次数: 0

Abstract

Iron-based shape memory alloys (Fe-SMAs) have emerged as innovative smart materials for structural rehabilitation. However, their application on fatigue repairing in steel bridges remains limited. This study aims to examine the effectiveness of Fe-SMA strengthening for repairing fatigue-cracked cope holes in orthotropic steel bridge deck (OSD). Experimental investigations were conducted on three full-scale specimens: one reference and two strengthened with unilateral and bilateral Fe-SMA configurations, respectively. Then a comprehensive fatigue testing was performed to evaluate failure mechanisms and fatigue performance improvement of diaphragm cope hole cracks. Finally, the feasibility of Fe-SMA strengthening for such cracks was verified through stress monitoring on an in-service steel bridge. Results demonstrate that Fe-SMA strengthening achieves a synergistic effect of prestressing introduction and local rigidity enhancement at the damaged cope holes, substantially improving fatigue performance. The equivalent fatigue lives of repaired cope hole increased by factors of 10.9 to 62. Bilateral reinforcement exhibited superior fatigue improvement compared to unilateral reinforcement, achieving complete suppression of crack propagation. Field monitoring revealed that under random traffic loading, all stress amplitudes at the cracked cope hole details after combined Fe-SMA bonding and stop-hole method were below the constant amplitude fatigue limit (CAFL), satisfying infinite-life design criteria.

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正交各向异性钢桥面孔疲劳裂纹Fe-SMA强化技术试验研究

铁基形状记忆合金（Fe-SMA）已成为用于结构修复的创新型智能材料。然而，它们在钢桥疲劳修复方面的应用仍然有限。本研究旨在考察 Fe-SMA 强化材料在修复正交异性钢桥面（OSD）疲劳开裂塞孔中的有效性。本研究对三个全尺寸试样进行了实验研究：一个参考试样和两个分别采用单侧和双侧 Fe-SMA 配置进行加固的试样。然后进行了全面的疲劳测试，以评估横隔梁斜孔裂缝的失效机理和疲劳性能改善情况。最后，通过对在役钢桥进行应力监测，验证了对此类裂缝进行 Fe-SMA 加固的可行性。结果表明，Fe-SMA 加固在受损的斜孔处实现了预应力引入和局部刚度增强的协同效应，大大改善了疲劳性能。修复后的斜孔等效疲劳寿命提高了 10.9 至 62 倍。与单侧加固相比，双侧加固的疲劳改善效果更好，能完全抑制裂纹扩展。现场监测结果表明，在随机交通荷载条件下，Fe-SMA 粘接和止动孔组合方法修复后的开裂坡口细节处的所有应力幅值均低于恒幅疲劳极限 (CAFL)，满足无限寿命设计标准。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.