（1南阳理工学院土木工程学院， 南阳 473000； 2 长沙理工大学桥梁工程安全控制教育部重点实验室， 长沙 410114；  3 南阳市高速公路有限公司， 南阳 473000）

［摘要］针对锈蚀导致钢筋与混凝土间变形不协调而对结构承载力的影响，引入一个变形不协调系数来表示锈蚀钢筋与混凝土之间的应变关系，根据6个RC梁的试验结果得到变形不协调系数随锈蚀率的变化关系。在平截面假定不成立的前提下，考虑变形不协调系数的影响，根据代数几何关系和内力平衡方程求得混凝土的受压区高度，进而得到相应正截面抗弯承载力计算公式。最后，利用已有文献的试验结果验证了该计算公式的正确性。

［关键词］钢筋混凝土梁； 锈蚀； 变形不协调系数； 平衡方程； 抗弯承载力

中图分类号：TU441-4文献标识码：A文章编号：1002-848X(2017)04-0044-05

Calculation and analysis of flexural bearing capacity of corroded reinforced concrete beams

Guo Shihui1,2， Liu Bing3

(1 School of Civil Engineering， Nanyang Institute of Technology, Nanyang 473000, China; 

2 Key Laboratory for Safety Control of Bridge Engineering, Changsha University of Science & Technology, Changsha 410114, China;  

3 Nanyang Expressway Limited Company, Nanyang 473000, China)

Abstract:The impact of deformation non-coordination between the steel bars and concrete caused by steel bar corrosion on the flexural bearing capacity of   structure was investigated. A deformation non-coordination coefficient was introduced to express the strain relationship between corroded steel bars and concrete. The relationship between the deformation non-coordination coefficient and the corrosion ratio was obtained based on test results of six  RC beams. On the premise that the plane section assumption was not satisfied and deformation non-coordination coefficient was considered, the compression zone height of concrete was obtained by  algebraic geometry relations  and force equilibrium equations. The corresponding calculation formula of flexural bearing capacity of cross-section  was obtained. Finally, the correctness of the calculation formula was verified by the experimental results from existing literatures.

Keywords:reinforced concrete beam; corrosion; deformation non-coordination coefficient; equilibrium equation; flexural bearing capacity

*河南省基础与前沿技术研究计划项目(152300410017)， 长沙理工大学桥梁工程湖南省高校重点实验室开放基金项目(14KA01)。

作者简介：郭诗惠，硕士，副教授， Email:guoguo91@126.com。