多场耦合作用下氯离子侵蚀混凝土的数值模拟研究

项目名称： 多场耦合作用下氯离子侵蚀混凝土的数值模拟研究

项目编号： No.11302034

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 李荣涛

作者单位： 大连大学

项目金额： 23万元

中文摘要： 沿海地区的钢筋混凝土结构，长期受到氯离子的侵蚀，从而致使混凝土中的钢筋产生锈蚀，结构的承载能力明显下降，导致结构较早损坏，给钢筋混凝土结构的耐久性带来极大危害。本项目在以复杂氯盐环境下的混凝土构件和结构氯离子侵蚀破坏这一重大安全隐患问题为背景，开展混凝土结构耐久性与使用寿命的预测及提高的数值模拟研究。发展混凝土中热-湿-气-力学全耦合的氯离子传输模型，全面有效地预测和评估渗有氯盐混凝土中的氯离子传输和分布规律；建立氯离子侵蚀下的混凝土弹塑性－损伤耦合本构模型及其相应的求解方法，数值模拟渗有氯盐的混凝土中化学-热-湿-力学耦合作用下的材料非线性力学行为；利用建立的数值模型和方法探讨各种氯离子侵蚀预防措施的有效性及改进方法，寻找预防氯盐腐蚀的最优解决方案。本项目的研究成果将可广泛用于混凝土构件和结构的减防腐蚀灾害设计中，服务于工程实际，具有重要的理论意义和广阔的应用前景。

中文关键词： 混凝土；氯离子侵蚀；多场耦合；有限元法；数值模拟

英文摘要： Reinforced concrete structures in the littoral long-timely suffer the erosion of chloride ions, which leads to the corrosion of reinforcement embedded in concrete and further arouses significantly carrying capacity reduction of structure, and the results of these do damage to the durability of structure. With the potential safety hazard of concrete structures in the complicated chloride environment as the background, a numerical simulation on prediction and prevention of chloride ions erosion in concrete structure under multifactor coupling will be done in this project. The emphases of this project are focused on the three aspects of the subject. Firstly, a coupled thermo-hygro-mechanical mathematical model to quantitatively predict the transportation and distribution of chloride ions in concretes exposed to chloride environment will be proposed. Secondly, a coupled elastoplastic-damage constitutive model taking into account chloride-induced elastoplastic-damage effects for the simulation of coupled chemo-thermo-hygro- mechanical behavior in concretes under chloride environment will be developed. Finally, various methods for protecting concrete structures against excessive degradation in chloride conditions will be numerically analyzed by means of the proposed model. According to efficiency of these methods, the

英文关键词： concrete；chloride ions penetration；coupled multiphase；finite element method；numerical analysis