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考虑到铁塔基础横截面形状对氯离子扩散性的影响,本文对应力损伤下钢筋混凝土结构氯离子二维扩散机理进行了数值研究。在综合分析氯离子扩散系数影响因素的前提下,首先建立了混凝土氯离子扩散的有限元模型,具体研究了应力损伤下横截面形状、钢筋直径和保护层厚度对混凝土氯离子传输特性的影响。研究表明,横截面形状对混凝土氯离子扩散性有重要影响,矩形截面角点附近的氯离子浓度要高于其他截面。对于相同的横截面形状,钢筋与混凝土交界面处的氯离子浓度明显高于远离钢筋的位置。
Considering the influence of the basic cross-sectional shape of the tower on the chloride diffusion, a numerical study of the two-dimensional chloride ion diffusion mechanism of reinforced concrete structures under stress damage is carried out. Based on a comprehensive analysis of the influencing factors of chloride ion diffusion coefficient, a finite element model of chloride ion diffusion in concrete was established. The influence of cross-sectional shape, rebar diameter and protective layer thickness on concrete chloride ion transport properties was studied. Research shows that the cross-sectional shape of concrete chloride ion diffusion has a significant impact, near the rectangular cross-section of the chloride concentration higher than the other cross-section. For the same cross-sectional shape, the concentration of chloride ions at the interface between steel and concrete is significantly higher than the distance away from the reinforcement.