摘要
混凝土在硫酸盐侵蚀下将发生化学-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-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。
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.
出处
《混凝土》
CAS
北大核心
2017年第1期39-43,共5页
Concrete
基金
国家973计划项目(2011CB013801)
国家自然科学基金(51308285)
江苏省自然科学基金(BK20130943)
江苏省高校自然科学面上项目(13KJB560004)
江苏省高校自然科学研究重大项目(14KJA560001)
江苏省产学研联合创新资金--前瞻性联合研究项目(BY2014005-05)
关键词
硫酸盐侵蚀
数值模拟
损伤强度
sulfate attack
numerical simulation
damage strength
