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中文摘要：
针对混凝土结构设计规范中环境作用等级和耐久性设计指标开展对比分析，研究了氯盐环境下国内外混凝土结构耐久性设计规范中环境作用等级划分的方式、依据和各规范之间的差异，以及该差异对混凝土结构耐久性设计指标造成的影响。通过案例分析表明：各国标准和规范对混凝土结构在氯盐环境下耐久性设计指标均根据其所处的环境作用等级确定；环境作用等级主要根据混凝土结构在腐蚀环境中的空间位置和环境作用强度进行划分；各国规范对相同环境条件同一混凝土结构的耐久性设计指标的取值有所区别，我国规范对于氯盐环境的作用等级分类更细。
英文摘要：
Environment exposure class and durability design index of concrete structure codes were analyzed contrastively.The method, theoretical basis and the differences of categorizing exposure classes on concrete structure in chloride environment of concrete durability codes at home and abroad were studied.The research results showed that durability design index in chloride environment was determined by environment exposure class.The exposure class of concrete structure in chloride environment was judged mainly by the spatial position of concrete member and the severity of corrosion on the concrete structure in the codes at home and abroad.The values of durability design indices for same environment and concrete structure in concrete design codes at home and abroad were different.
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