耐用性.混凝土结构使用寿命设计

[中文适用范围]： 本国际标准规定了验证混凝土结构耐久性的原则和建议程序，其中： - 已知或可预见的环境行为导致材料劣化，最终导致性能失效； ——在没有结构外部环境侵蚀的情况下材料劣化，称为自老化。 注：例如，如果环境中没有额外的氯化物进入，混凝土混合物中包含的氯化物可能会随着时间的推移而导致性能恶化。 本国际标准供国家标准化机构在建立或验证混凝土结构耐久性要求时使用。 它还可以应用于： ——评估现有结构的剩余使用寿命； ——对于新结构的使用寿命设计，提供了可靠性水平的量化参数，并且设计参数在本国际标准的国家附录中给出。 循环应力引起的疲劳破坏不属于本国际标准的范围。 [外文原描述]： This International Standard specifies principles and recommends procedures for the verification of the durability of concrete structures subject to: — known or foreseeable environmental actions causing material deterioration ultimately leading to failure of performance; — material deterioration without aggressiveness from the external environment of the structure, termed selfageing. NOTE The inclusion of, for example, chlorides in the concrete mix might cause deterioration over time without the ingress of additional chlorides from the environment. This International Standard is intended for use by national standardization bodies when establishing or validating their requirements for durability of concrete structures. It may also be applied: — for the assessment of remaining service life of existing structures; and — for the design of service life of new structures provided quantified parameters on levels of reliability and design parameters are given in a national annex to this International Standard. Fatigue failure due to cyclic stress is not within the scope of this International Standard.