Abstract Design for internal limit states of steel grid reinforcement in mechanically stabilized earth (MSE) walls must provide for loss of steel thickness due to corrosion. The paper combines key features of zinc and steel corrosion models used in North American practice with corrosion rate statistics reported in the literature for the zinc coating on buried galvanized steel strips and for steel rebar. Examples of loss of strength and pullout capacity of steel grid elements constructed with different member diameters and up to 120 years after construction are presented in probabilistic terms. Results of reliability-based analysis for the tensile strength and pullout limit state at design lives of 75 and 120 years are demonstrated for a typical wall under operational conditions using tensile load and resistance models in combination with non-aggressive soils recommended in North American design codes. The results of calculations show that for the wall example the influence of different zinc cover thickness on probability of tensile failure of longitudinal members is detectable at the end of design life. However, the typical minimum specified zinc thickness of 0.086 mm recommended in North American practice is likely sufficient to keep probabilities of failure to 1% or less (i.e., reliability index of 2.33 or greater). The influence of a range of initial zinc thickness reported in the literature on probability of pullout failure of the same steel grid elements was found to be negligible.

中文翻译：

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腐蚀对钢格板MSE墙基于可靠性设计的影响

摘要 机械稳定土 (MSE) 墙中钢格网钢筋内部极限状态的设计必须考虑到由于腐蚀造成的钢厚度损失。该论文将北美实践中使用的锌和钢腐蚀模型的关键特征与文献中报道的埋地镀锌钢带和钢筋的锌涂层腐蚀率统计数据相结合。用不同的构件直径建造的钢格栅元件在建造后长达 120 年的强度和拉拔能力损失示例以概率术语呈现。使用拉伸载荷和阻力模型，结合北美设计规范中推荐的非侵蚀性土壤，对典型墙体在 75 年和 120 年设计寿命下的抗拉强度和拉拔极限状态进行了基于可靠性的分析结果. 计算结果表明，对于墙体示例，在设计寿命结束时，可以检测到不同锌层厚度对纵向构件拉伸失效概率的影响。然而，北美实践中推荐的典型最小指定锌厚度 0.086 毫米可能足以将失效概率保持在 1% 或更低（即，可靠性指数为 2.33 或更高）。