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中文摘要：
有限元法是分析氯离子在混凝土中扩散常用的方法，但它需要在时间域上做细密的离散网格，增加了计算时间及模型的复杂性。首次采用边界元法建立二维混凝土结构中氯离子一维扩散分析模型，提出了计算长度的概念及其表达式，使得计算模型中避免了对时间域的离散。同时由于边界元法可以将二维问题降低为一维离散问题，所以该计算模型可以大大简化计算过程，提高计算精度。算例分析验证了该方法的计算效率和可行性。
英文摘要：
The finite element method（ FEM ） is usually adopted for chloride diffusion in concrete, which require much fine mesh of discretization in time domain as well as spatial one,and results in a fairly long time of computation.The boundary element method （BEM） for one-dimensional diffusion analysis of chloride ion is established in two-dimensional concrete structures along with the concept of computing length and its expression for the first time.No discretizing mesh is required for the time domain,while the spatial domain is discretized along the boundary of the computing diffusion field in the BEM model,which reduces the computation time steeply,compared with the FEM.An example demonstrates the efficiency and accuracy of the presented method,in which the results by the BEM is compared with those by the FEM and the analytical one.
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