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钢筋组合方式对混凝土保护层锈胀开裂影响
程旭东,苏巧芝,向恩泽,梁晓岑,王子栋,张如林,黄思凝
(中国石油大学(华东)储运与建筑工程学院,山东青岛 266580)
摘要:
钢筋锈蚀是引发混凝土结构劣化的主要原因之一。给出一个二维的扩散-力学模型,通过有限元软件将氯离子侵蚀引起的非均匀腐蚀膨胀层作为位移荷载,模拟钢筋锈胀对周围混凝土的力学作用。基于该模型,分析不同钢筋组合对保护层锈胀开裂的影响。结果表明:不同钢筋组合会造成不同的裂缝扩展路径;根数少且直径大的钢筋组合不仅能延缓裂缝出现和贯通时间,而且有利于减小表面最大裂缝宽度和钢筋截面损失率。
关键词:  钢筋组合  钢筋锈蚀  开裂路径  裂缝宽度  钢筋截面损失率
DOI:10.3969/j.issn.1673-5005.2019.04.016
分类号::TU 375
文献标识码:A
基金项目:国家重点研发计划(2018YFC1504404,8YFC1504406);山东省自然科学基金项目(ZR2019MEE099)
Influence of reinforcement arrangements on concrete cover cracking due to corrosion
CHENG Xudong, SU Qiaozhi, XIANG Enze, LIANG Xiaocen, WANG Zidong, ZHANG Rulin, HUANG Sining
(College of Pipeline and Civil Engineering in China University of Petroleum (East China), Qingdao 266580, China)
Abstract:
Steel corrosion is one of the main causes for the deterioration of concrete structures. A 2D diffusion-mechanical model was established. The non-uniform corrosion expansion induced by chloride ingress was regarded as the displacement load through the finite element software, to simulate the mechanical effect of corrosion expansion on surrounding concretes.Based on this model, the influence of different reinforcement arrangements on the corrosion-induced cover cracking was investigated. The results show that different reinforcement arrangements will cause different cracking paths, and the reinforcement arrangements with fewer quantities and larger diameters can not only delay the crack initiation and through time, but also reduce the maximum crack width and section area loss ratio on the surface of the steel bar.
Key words:  reinforcement arrangement  steel corrosion  cracking paths  crack width  section area loss ratio of steel bar
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