地铁钢筋混凝土界面多尺度腐蚀疲劳损伤及失效机理研究

项目名称： 地铁钢筋混凝土界面多尺度腐蚀疲劳损伤及失效机理研究

项目编号： No.51478183

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 王凯

作者单位： 华东交通大学

项目金额： 85万元

中文摘要： 疲劳荷载与杂散电流和氯离子形成的腐蚀疲劳是导致地铁轨道结构钢筋混凝土界面损伤劣化发生脱粘的主要原因。从工程应用角度，急需探明此类典型服役条件下地铁钢筋混凝土界面腐蚀疲劳损伤退化机制。针对这一科学问题，本项目拟利用疲劳与钢筋锈蚀耦合加载试验装置，采用超声红外热像技术研究疲劳荷载与杂散电流和氯离子共同作用对地铁钢筋混凝土界面粘结力学性能的影响。并在明确疲劳荷载应力水平、杂散电流强度和氯离子浓度对其以及界面微细观结构影响规律的基础上，探明宏观损伤与微细观损伤演变之间定量关系；然后通过多尺度过渡途径，将微细观损伤特性植入宏观表现中，建立基于界面微细观结构演变的多尺度腐蚀疲劳损伤模型，揭示地铁钢筋混凝土界面腐蚀疲劳损伤失效机理，为开发地铁高性能混凝土结构材料提供理论依据；同时采用有限元数值模拟地铁钢筋混凝土界面腐蚀疲劳损伤累积及渐近破坏过程，实现综合评价与预测实际地铁钢筋混凝土界面长期粘结性能。

中文关键词： 地铁钢筋混凝土；界面损伤；腐蚀疲劳；失效机理；多尺度分析

英文摘要： The corrosion fatigue formed by fatigue load, stray current and chloride ions is the main cause resulting in the damage degradation of the subway rail structure reinforcement and concrete interface to debond. From the perspective of engineering application, the corrosion fatigue damage degradation mechanism of subway reinforced concrete interface in such typical service conditions urgently need to ascertain. For the scientific problem, the effect of the combined actions of fatigue load, stray current and chloride ions on the bond mechanical properties of subway reinforced concrete interface by the coupled loading test device of fatigue and steel corrosion is investigated using ultrasonic infrared thermal image technology in the project. The quantitative relationship between macro- and micro-damage evolutions of subway reinforced concrete interface is then made clear after that the influence laws of fatigue load stress, stray current strength and chloride ions concentration on them are ascertained. And then the micro-damage characteristics is inserted in the macro-damage behaviors by way of multiscale transition method to establish a multiscale corrosion fatigue damage model based on the interface microstructure evolution, and the corrosion fatigue damage failure mechanism of subway rail reinforced concrete interface is revealed to provide the theoretical basis for the development of high performance concrete structural materials. The finite element numerical simulation of the corrosion fatigue damage accumulation and asymptotic failure process is carried out to evaluate comprehensively and predict the long-term bond properties of the actual subway reinforced concrete interface.

英文关键词： subway reinforced concrete;interface damage;corrosion fatigue;failure mechanism;multiscale analysis