钢筋不均匀锈蚀引起的混凝土保护层开裂有限元分析  

FEM analysis on the crack process of concrete cover induced by non-uniform corrosion of re-bar

作　　者：韦俊[1] 孟浩[2] 薛圣广 

机构地区：[1]苏州科技学院,江苏苏州215011 [2]苏州二建集团,江苏苏州215004 [3]温州建筑设计研究院,浙江温州325000

出　　处：《西安建筑科技大学学报（自然科学版）》2011年第5期747-754,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：建设部研究开发项目(2008-K2-35)

摘　　要：钢筋发生锈蚀,将导致混凝土保护层受拉而开裂,严重影响混凝土结构的耐久性.针对自然环境下混凝土构件中的钢筋往往是非均匀锈蚀,利用ABAQUS有限元软件,采用对钢筋周围混凝土施加不均匀锈胀位移的方法模拟钢筋非均匀锈蚀情况下保护层的开裂过程,基于有限元分析结果,得到保护层胀裂破坏时临界径向位移计算公式;以此为基础,推导了钢筋非均匀锈蚀时保护层开裂时钢筋锈蚀率的计算公式.最后,通过试验验证了本文提出的锈蚀率计算公式的合理性.Occurrence of re-bar corrosion will lead to the concrete cover cracking, which seriously affect the durability of concrete structures. In dealing with the non-uniform corrosion of re-bar in concrete components under natural environ- ment, the paper simulates the cracking process of concrete cover using a finite-element based method with ABAQUS soft- ware. Based on the FEM analysis results, the formula of the critical radial displacement at the cracking time is used to predict the corrosion ratio at the cracking time of cover concrete. Finally, the analytical corrosion ratio formula presented herein is verified with the laboratory test.

关 键 词：混凝土 保护层 钢筋非均匀锈蚀 钢筋锈蚀率 径向位移 

分 类 号：U441[建筑科学—桥梁与隧道工程]