| 摘要: |
| 腐蚀环境和反复荷载共同作用下混凝土结构的疲劳问题愈发突出，特别是混凝土结构在荷载作用下产生和发展的裂缝为腐蚀介质提供了快速传输通道，引起开裂区域钢筋局部坑蚀。动态荷载作用下疲劳裂纹在蚀坑底部形成并扩展，导致钢筋脆性断裂，进而导致混凝土构件的疲劳失效。回顾并分析了混凝土裂缝对钢筋疲劳性能的影响、坑蚀钢筋疲劳性能研究进展和基于弱磁效应的钢筋疲劳研究，指出掌握坑蚀钢筋的裂纹扩展行为是进行服役混凝土结构疲劳寿命预测的关键。弱磁效应能够实时地表征锈蚀钢筋的疲劳断裂行为，建立基于弱磁理论的锈蚀钢筋等效裂纹扩展长度和应力强度因子变幅表征方法，是服役钢筋混凝土结构疲劳寿命预测的一个创新方法。 |
| 关键词: 混凝土结构 锈蚀钢筋 钢筋疲劳 弱磁理论 寿命预测 |
| DOI：10.12170/201906003 |
| 分类号:TU375 |
| 基金项目:国家自然科学基金资助项目（51820105012，51908496）；浙江省自然科学基金资助项目（LQ19E080011）；宁波市自然科学基金资助项目（2017A310313） |
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| A review on fatigue research of corroded reinforcing steel bars inside reinforced concrete structures |
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ZHANG Jun1, JIN Weiliang2, ZHANG Kai1,2, MAO Jianghong1, LI Qiang1
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1.Ningbo Institute of Technology, Zhejiang University, Ningbo;2.Institute of Structural Engineering, Zhejiang University, Hangzhou
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| Abstract: |
| The fatigue of concrete structures under the combined action of corrosive environment and repeated loads is becoming much severer. Cracks of reinforced concrete structures are easily induced by static and cyclic loading. These compromising transmission paths for corrosive medium will result in non-uniform corrosion of reinforcing steel bars, especially etch pits. At the bottom of hazardous etch pits, fatigue cracks will form and grow under dynamic loading until brittle fracture. We reviewed and analyzed the influence of concrete cracks on the fatigue properties of steel bars, the research progress of fatigue properties of pitting corroded steel bars and the fatigue of steel bars based on weak magnetic theory. Understanding the crack propagation behavior of pitting corroded steel bars is very essential for predicting the fatigue life of concrete structures inservice. Finally, a fatigue research method based on weak magnetic field theory is proposed to characterize the fatigue fracture behavior of corroded steel bars in real time. The corresponding characterization methods of equivalent crack propagation length and stress intensity factor variation of corroded steel bars may be novel for predicting the fatigue life of reinforced concrete structures-inservice. |
| Key words: reinforced concrete structures corroded steel bars steel fatigue weak magnetic theory life prediction |
