| 交叉钢筋的宏观锈蚀及其对钢筋混凝土构件抗力的影响 |
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| 引用本文： | 董征,顾祥林,张伟平,袁琴. 交叉钢筋的宏观锈蚀及其对钢筋混凝土构件抗力的影响[J]. 建筑结构学报, 2019, 40(1): 105-112 |
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| 作者姓名： | 董征 顾祥林 张伟平 袁琴 |
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| 作者单位： | 同济大学工程结构服役性能演化与控制教育部重点实验室,上海200092;同济大学土木工程学院,上海200092;同济大学土木工程学院,上海,200092 |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划（973计划） |
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| 摘 要： | 经现场调查及试验发现,混凝土中存在箍筋锈蚀较纵筋严重或交叉钢筋相交处锈蚀严重的现象。为了量化比较微观锈蚀与交叉钢筋间的宏观锈蚀,且不考虑力学损伤(如弯折)对钢筋锈蚀性能的影响,将配有交叉钢筋的混凝土试件置于海洋大气环境模拟箱中进行锈蚀试验。试验结果表明,交叉钢筋间的宏观电流密度i_g约占钢筋自腐蚀(微观)电流密度icorr1的1/10～1/1,钢筋的微观锈蚀占主导地位。基于试验结果,采用蒙特卡洛法对交叉钢筋间宏观锈蚀作用下混凝土梁、板的时变抗力进行了算例分析。结果表明,与仅考虑箍筋微观锈蚀的情况相比,当i_g与icorr1的比值接近于1时,微观与宏观锈蚀耦合作用下混凝土梁的失效模式会过早地由受弯破坏转变为受剪破坏;对混凝土板而言,i_g仅为icorr1的1/10时,也会使混凝土板在长期锈蚀过程中的失效概率增大。
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| 关 键 词： | 钢筋混凝土构件 交叉钢筋 模拟海洋大气环境 宏观锈蚀 时变抗力 |
Macro-cell corrosion between crossed steel bars and its influence on capacities of reinforced concrete structural members |
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| DONG Zheng,GU Xianglin,ZHANG Weiping,YUAN Qin. Macro-cell corrosion between crossed steel bars and its influence on capacities of reinforced concrete structural members[J]. Journal of Building Structures, 2019, 40(1): 105-112 |
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| Authors: | DONG Zheng GU Xianglin ZHANG Weiping YUAN Qin |
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| Affiliation: | (Key Laboratory of Performance Evolution and Control for Engineering Structures of the Ministry of Education, Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China) |
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| Abstract: | DONG Zheng;GU Xianglin;ZHANG Weiping;YUAN Qin(Key Laboratory of Performance Evolution and Control for Engineering Structures of the Ministry of Education, Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China) |
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| Keywords: | reinforced concrete structural member crossed steel bar simulated marine atmospheric environment macro-cell corrosion time-dependent capacity |
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