CAJ | 학술논문

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。
대2근상린강근비균균수식팽창인발적혼응토보호층파배행위진행료세관수치모의연구；고필도혼응토세관결구비균질성적영향，장혼응토시위유골료、사장화계면과도구조성적삼상복합재료，이시가강제위이적방식모의강근적비균균수창작용，건립료혼응토보호층개렬분석적세관척도수치모형，병진행료영향삼수분석。결과표명：세관수치모의결과여이유문헌중적시험결과문합량호；상린강근비균균수식시회발생내부렬문상호관통선우화락후우외부개렬2충파배모식；강근직경불시영향혼응토보호층파배적주요삼수；혼응토보호층후도주요영향외부개렬적발전；강근간거칙주요공제내부렬문적상호관통。
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 .