摘要
对2根相邻钢筋非均匀锈蚀膨胀引发的混凝土保护层破坏行为进行了细观数值模拟研究;考虑到混凝土细观结构非均质性的影响,将混凝土视为由骨料、砂浆和界面过渡区组成的三相复合材料,以施加强制位移的方式模拟钢筋的非均匀锈胀作用,建立了混凝土保护层开裂分析的细观尺度数值模型,并进行了影响参数分析。结果表明:细观数值模拟结果与已有文献中的试验结果吻合良好;相邻钢筋非均匀锈蚀时会发生内部裂纹相互贯通先于和落后于外部开裂2种破坏模式;钢筋直径不是影响混凝土保护层破坏的主要参数;混凝土保护层厚度主要影响外部开裂的发展;钢筋间距则主要控制内部裂纹的相互贯通。
In order to investigate the crack process of concrete cover induced by two adjacent rebar non-uniform corrosion ,a meso-scale numerical model was established .Considering the influence of concrete meso-structure , the concrete was assumed to be a three-phase composite material composed of aggregate ,mortar matrix and interfacial transition zone （ITZ） ,and the mechanical effect of rebar non-uniform corrosion was simulated by the forced displacement .A parametric study was conducted based on the model .The results show that the meso-scale simulation results are coincided with the test results from the literature ;there are two failure patterns including internal cracking penetration taken place more easily or difficult than external cracking ;rebar diameter is not a main parameter influencing the failure of concrete cover ; concrete cover thickness effects the development of external cracking principally ;and rebar distance controls internal cracking penetration predominantly .
出处
《建筑科学与工程学报》
CAS
北大核心
2014年第3期98-104,共7页
Journal of Architecture and Civil Engineering
基金
国家重点基础研究发展计划("九七三"计划)项目(2011CB013600)
北京市自然科学基金重大项目(8100001)
关键词
混凝土保护层
细观数值模拟
钢筋非均匀锈蚀
锈胀机理
破坏模式
concrete cover meso-scale numerical simulation rebar non-uniform corrosion corro-sion mechanism failure mode
