混凝土中氯离子扩散的二维有限元法数值模拟

现今研究者大多利用 Fick 第二定律及其数学模型的解析解对暴露于氯离子环境下的混凝土材料和构件进行一维分析.本研究建立了氯离子在混凝土中扩散的二维有限元数值模型,并将计算结果与解析解、无网格法和试验结果进行了比较.结果表明,与一维有限元方法、无网格法相比,使用二维有限元数值模型可以较好的预测混凝土中不同时间、位置变化的氯离子集聚和扩散情况,特别在角点等几何构造较为复杂的区域.

Two-dimensional finite element simulation for chloride diffusion in concrete

Fick's Second Law and its analytical solution were usually used for one-dimensional analysis of chloride diffusion in concrete by researchers.The two-dimensional finite element analysis of chloride diffusion in concrete is established,its result were compared by analytical solution,the mesh-free method and experimental results,respectively.Examples show that the two-dimensional finite element method achieves satisfied results in predicting the chloride concentration and diffusion in concrete under different time and location,especially in the corner or other places with complicated geometric profiles,compared with one-dimensional FEM and the mesh-free method.