东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (2): 290-293.DOI: 10.12068/j.issn.1005-3026.2014.02.031

• 资源与土木工程 • 上一篇    下一篇

混凝土结构保护层开裂时钢筋的临界锈蚀率模型

邱兆国1,2，梁力1，张凤鹏3   

  1. (1东北大学 资源与土木工程学院， 辽宁 沈阳110819； 2东北大学 理学院， 辽宁 沈阳110819；3东北大学 深部金属矿山安全开采教育部重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2013-03-06 修回日期:2013-03-06 出版日期:2014-02-15 发布日期:2013-11-22
  • 通讯作者: 邱兆国
  • 作者简介:邱兆国(1974-)，男，江苏徐州人，东北大学博士研究生；梁力(1955-)，男，辽宁丹东人，东北大学教授，博士生导师；张凤鹏(1967-)，男，辽宁葫芦岛人，东北大学教授.
  • 基金资助:
    国家自然科学基金资助项目(41201007).

Critical Corrosion Rate Model for Reinforcement During Cracking of Concrete Cover

QIU Zhaoguo1,2， LIANG Li1， ZHANG Fengpeng3   

  1. 1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. School of Sciences， Northeastern University， Shenyang 110819， China; 3. Key Laboratory of Ministry of Education on Safe of Deep Metal Mines， Northeastern University， Shenyang 110819， China.
  • Received:2013-03-06 Revised:2013-03-06 Online:2014-02-15 Published:2013-11-22
  • Contact: LIANG Li
  • About author:-
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摘要： 基于弹性理论与Bazant理论模型，引入拉伸损伤的概念，对混凝土保护层内环向应力进行修正，建立了混凝土保护层开裂时的临界锈胀力与钢筋临界锈蚀率模型.考虑钢筋混凝土界面间隙及锈蚀产物在裂缝中的填充效应，探讨了完全弹性、Bazant理论模型与拉伸损伤3种不同的环向应力下，钢筋直径、保护层厚度、锈胀系数对临界锈蚀率的影响.结果表明:临界锈蚀率随钢筋直径的增大而减小，随保护层厚度、锈胀系数的增大而增大.弹性下的临界锈蚀率大于Bazant理论模型与拉伸损伤下的临界锈蚀率.最后，与Morinaga的基于试验的临界锈蚀率模型比对，验证了模型的合理性.

关键词: 保护层开裂, 锈蚀率, 锈胀系数, 理想塑性, 拉伸损伤

Abstract: Based on the theory of elasticity and Bazant’s physical model， the loop stress in concrete cover was modified correspondingly by introducing the concept of tensile damage， and models of critical corrosionexpansion stress and reinforcement corrosion rate were built at the moment when the concrete cover began to crack. By considering the filling effect of corrosion products in clearance between reinforcement and concrete and in the cracks， focus was given on the influences of the reinforcement diameter， concrete cover thickness and corrosionexpansion coefficient on the critical corrosion rates under 3 different loop stress conditions. These 3 conditions are proposed as perfect elasticity， Bazant model and tensile damage hoop stress， respectively. The results show that the critical corrosion rate decreases with the increase of the bar diameter， and increases with the increase of concrete cover thickness and corrosionexpansion coefficient. The critical corrosion rate in perfect elasticity is higher than that in Bazant model and in tensile damage. Finally， by comparing with Morinaga’s models， the models introduced in this paper are proved to be reasonable.

Key words: cover cracking, corrosion rate, corrosionexpansion coefficient, ideal plasticity, tensile damage

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