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提出了一种Cl-侵蚀的数值模拟方法。针对结构所处的水下区、潮差区、浪溅区和大气区不同的侵蚀机理,考虑温度、相对湿度、混凝土龄期、结合Cl-及对流影响,参考国内外研究成果建立相应的理论公式;以COMSOL为基础,将温度、湿度和Cl-运输进行多场耦合,开发出数值模拟程序,并对青岛海湾大桥某桥墩的Cl-侵蚀情况进行数值模拟。结果表明:该数值方法可以很好地模拟沿海混凝土结构Cl-侵蚀;钢筋去钝化依次出现在潮差区、浪溅区、水下区和大气区;对本实例,如不做特殊防护,钢筋去钝化最先开始的位置约为高程-2.200 m处(潮差区中心位置附近),该处钢筋去钝化时间约为25 a。
A Cl-erosion numerical simulation method is proposed. In view of the different erosion mechanisms of underwater, tidal range, splash zone and atmosphere in the structure, taking into account temperature, relative humidity, concrete age, combined with the effect of Cl- and convection, reference to the domestic and foreign research results to establish the corresponding theory Based on COMSOL, multi-field coupling of temperature, humidity and Cl-transport was carried out to develop a numerical simulation program. The Cl-erosion of a bridge pier in Qingdao Bay Bridge was numerically simulated. The results show that the numerical method can well simulate the Cl-erosion of coastal concrete structures; the de-passivation of steel bars occurs in the tidal range, wave-splashing zone, underwater zone and atmosphere zone in turn; for this example, without special protection, The first place to depassivation is about elevation -2200 m (near the center of the tide zone) where the bar depassivation time is about 25 a.