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中文摘要：
针对钢筋锈蚀是影响钢筋混凝土结构使用寿命的重要因素,以及锈胀开裂为结构耐久性寿命的临界点的现象,假定混凝土满足双剪强度准则,利用厚壁圆筒理论,对均匀锈胀开裂过程进行弹塑性分析,建立了均匀锈胀厚壁圆筒模型.结合Faraday腐蚀定律,得到了锈胀开裂时间计算式.通过对计算式各主要参数的分析,发现增大混凝土保护层厚度、减小钢筋直径以及降低铁锈膨胀率,能有效提高钢筋混凝土结构的耐久性;混凝土强度等级对结构耐久性影响较小.理论计算值与已有试验值吻合较好,计算式合理、可行.
英文摘要：
Steel corrosion is an important factor on service life of reinforced concrete（ RC） structures,and concrete cracking induced rebar corrosion is a critical point of structural durability life. Based on the assumption of concrete following twin shear strength criterion,according to thick-walled cylinder theory,the elastoplastic analysis of rebar uniform corrosion expansion process was conducted,and the thickwalled cylinder model of uniform rust expansion was established. Combined with the Faraday law,the time equation of concrete cracking induced rebar rust was calculated. The main factors affecting the equation were analyzed. The results show that with the increasing of cover thickness,decreasing of rebar diameter and reducing volume expansion of corrosion products, the durability of RC structures is improved. The concrete strength has little effect on the durability of RC structures. The theoretical values of calculation are in good agreement with the existing experimental results,and the proposed equation is reasonable and feasible.
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