重庆大学学报2017，Vol.40Issue(3)：70-75,6.DOI:10.11835/j.issn.1000-582X.2017.03.008
钢筋非均匀锈蚀引起混凝土保护层内裂分析
Analysis on the internal cracking of concrete cover caused by rebar non-uniform corrosion
摘要
Abstract
According to the corrosion development of rebar that occurred before concrete cover cracking under natural conditions,the corrosion layer was simplified as a non-uniform distribution with semielliptical shape to model the non-uniform corrosion of rebar.Formulas were obtained to calculate the corrosion expansion stress of the concrete cover by using theoretical analysis,and its accuracy was verified by compared with finite element results.According to the theoretical solution,the maximum circumferential stress is on the horizontal axis,so the development of the corrosion layer can induce the horizontal internal crack inside the cover.Increasing rebar diameter can effectively decrease the corrosionexpansion stress and improve the ability of anti-rust crack of reinforced concrete structure.Calculated results indicate that the critical thickness of corrosion layer in the uniform corrosion model is far less than that in the non-uniform corrosion model and the result of uniform corrosion model is conservative.Therefore,the non-uniform corrosion model is validated to be much closer to the truth to analysis the corrosion problems.关键词
非均匀锈蚀/混凝土/开裂/理论模型Key words
non-uniform corrosion/concrete/crack/theoretical model分类
建筑与水利引用本文复制引用
汪奔,王弘,张志强,周蒙蛟..钢筋非均匀锈蚀引起混凝土保护层内裂分析[J].重庆大学学报,2017,40(3):70-75,6.基金项目
国家自然科学基金资助项目(51478396,51078318) （51478396,51078318）
四川省青年科技创新团队基金资助项目(2013TD0004).Supported by the National Natural Science Foundation of China (51478396,51078318),the Sichuan Provincial Youth Science and Technology Innovation Team (2013TD0004). （2013TD0004）
