本研究通过试验研究和海洋工程耐久性参数大数据集的调研，明确了中国北方海洋工程耐久性设计参数的取值、范围和分布类型。基于修正的氯离子扩散理论模型和可靠性理论，计算了浪溅区、潮汐区和水下区混凝土结构的服役寿命。设计了满足100 年或120 年服役寿命要求的混凝土配合比，并提出了保护层厚度要求。此外，对比了边界条件（C_s）和扩散系数（D_f）的不同时变关系对服役寿命的影响，结果表明，本研究采用的时变关系（即C_s持续增加后保持稳定，D_f持续降低后保持稳定）对于海洋环境下混凝土结构的耐久性设计具有有利效应。

In this study, through experimental research and an investigation on large datasets of the durability parameters in ocean engineering, the values, ranges, and types of distribution of the durability parameters employed for the durability design in ocean engineering in northern China were confirmed. Based on a modified theoretical model of chloride diffusion and the reliability theory, the service lives of concrete structures exposed to the splash, tidal, and underwater zones were calculated. Mixed concrete proportions meeting the requirement of a service life of 100 or 120 years were designed, and a cover thickness requirement was proposed. In addition, the effects of the different time-varying relationships of the boundary condition (C_s) and diffusion coefficient (D_f) on the service life were compared; the results showed that the time-varying relationships used in this study (i.e., C_s continuously increased and then remained stable, and D_f continuously decreased and then remained stable) were beneficial for the durability design of concrete structures in marine environment.