混凝土氯离子扩散系数预测的三相复合圆—格构模拟方法  

A three-phase composite circle-lattice modeling method for predicting the chloride diffusivity of concrete

作　　者：梁云滢[1] 郑建军[1] 丁建江 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032 [2]浙江交通投资集团,浙江杭州310014

出　　处：《浙江工业大学学报》2010年第2期207-211,共5页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(50878196);浙江省自然科学基金资助项目(Y107638)

摘　　要：提出了混凝土氯离子扩散系数预测的三相复合圆—格构模拟方法.基于骨料分布的体视学分析,给出了界面面积百分数的解析算法.应用能量等效原理,导出了梁单元和连续体氯离子扩散系数之间的解析关系式.将混凝土模拟成三相复合圆,应用格构模拟方法确定每一个梁单元的刚度矩阵,并计算混凝土氯离子扩散系数.在数值方法的有效性得到试验结果的证实后,定量评价了最大骨料直径、界面氯离子扩散系数、骨料级配和界面厚度对混凝土氯离子扩散系数的影响.A three-phase composite circle-lattice modeling method was presented for predicting the chloride diffusivity of concrete. Based on the stereological analysis of aggregate distribution, an analytical algorithm for the interfacial transition zone （ITZ） area fraction was given. By applying the principle of energy equivalence, an analytical relationship of chloride diffusivity between the beam element and continuum body was derived. By modeling concrete as a three-phase composite circle, the stiffness matrix of each beam element was determined and the chloride diffusivity of concrete was calculated with the aid of the lattice modeling method. After the validity of the proposed numerical method in this paper was verified with experimental results, the effects of the maximum aggregate diameter, chloride diffusivity of ITZ, aggregate gradation and ITZ thickness were evaluated in a quantitative manner.

关 键 词：混凝土 氯离子扩散系数 界面面积百分数 格构模拟方法 

分 类 号：TU528.1[建筑科学—建筑技术科学]