桥梁缆索钢丝腐蚀疲劳失效机理研究进展

Research progress on corrosion fatigue failure mechanism of bridge cable steel wire

桥梁缆索是缆索桥梁的主要承重结构之一。由于在长期服役过程中涉及潮湿、腐蚀与疲劳,缆索内钢丝在湿-热-力作用下易发生腐蚀疲劳损伤与断裂,危及桥梁安全运营,因此研究缆索的腐蚀疲劳损伤机理,对评估缆索腐蚀疲劳损伤对桥梁整体结构性能的影响,保障桥梁运营安全有重要理论意义和应用价值。本文对近年来缆索钢丝及相关金属材料腐蚀疲劳的研究进展进行了综述。在简要介绍了金属腐蚀疲劳机理与缆索腐蚀疲劳失效形式的基础之上,介绍了宏观尺度缆索腐蚀疲劳研究进展,讨论了典型损伤失效模型与寿命预测方法;从裂纹萌生与裂纹扩展两方面介绍了微观尺度缆索腐蚀疲劳的研究现状,讨论了其作用机制及影响因素;进行了总结和展望,提出了复杂环境模拟、多机制耦合作用与宏微观跨尺度模型的研究方向,从而为高性能、长寿命缆索钢丝的设计与开发提供理论基础。

Bridge cable is one of the main load-bearing structures of cable bridge.Since the process of long-term service involves moisture,corrosion and fatigue,the steel wire in the cable is prone to corrosion fatigue damage and fracture under the action of wet-heat-force,which endangers the safe operation of the bridge.Therefore,studying the corrosion fatigue damage mechanism of the cable has important theoretical significance and application value for evaluating the influence of corrosion fatigue damage of the cable on the overall structural performance of the bridge and ensuring the operation safety of the bridge.This paper reviews the research progress of corrosion fatigue of cable wire and related metal materials in recent years.Based on the brief introduction of the mechanism of metal corrosion fatigue and the failure mode of cable corrosion fatigue,the research progress of cable corrosion fatigue at macroscopic scale is introduced,and the typical damage failure models and life prediction methods are discussed.The research status of corrosion fatigue of microscale cables is introduced from two aspects of crack initiation and crack propagation,and its mechanism and influencing factors are discussed in detail.The research direction of complex environment simulation,multi-mechanism coupling and macro and micro cross-scale model is proposed,which provides a theoretical basis for the design and development of high-performance and long-life cable wire.