中文摘要：

混凝土在硫酸盐侵蚀下将发生化学一力学耦合作用，并导致其力学性能退化和耐久性降低。基于Fick第二定律建立考虑侵蚀损伤演化的硫酸根离子扩散一反应耦合模型，运用Matlab实现该耦合过程的数值求解，得到硫酸盐腐蚀下的细观损伤时变规律，在此基础上建立损伤后混凝土梁式构件开裂强度分析方法，并通过算例进行了性能分析。

英文摘要：

The chemical-mechanical coupling effect of concrete subjected to sulfate attack would cause the deterioration in mechanical properties and durability of concrete.According to Fiek＇ s second law,adiffusion-reaction model of sulfate ions in concrete based on evolution of erosion-induced damage is proposed and the numerical solution of the coupling process is realized by Matlab program, then it is obtained thatthe time-invariant meso-damage mechanism of concrete under sulfate attack.With the time-invariant meso-damage mechanism,this paper presents an analytical method for the cracking strength of beam concrete specimens.Finally,the mechanical behavior is analyzed through a numerical example.