中文摘要：

对处于氯盐环境中的混凝土结构，为使其在设计使用寿命期内具有合格的可靠度要求，基于结构抗力劣化过程的动态计算模型及动态可靠度分析，在我国现行结构可靠度设计表达式基础上，引入结构耐久性系数y0来考虑抗力衰减对可靠指标的影响，并给出了耐久性系数的确定方法。针对50年设计使用年限情况，考虑港口结构3种荷载组合以及5种可变荷载与恒载效应比影响，给出不同的环境条件、水灰比、保护层厚度下结构耐久性系数y0的取值。从而建立了基于耐久性的可靠度设计实用方法。

英文摘要：

For concrete structures in chloride environment, in order to meet the qualified reliability requirement during their design service life, a method of determining the durability parameter is proposed by introducing the structural durability coefficient TD tO consider the influence of resistance attenuation on reliability index, based on the dynamic calculation model and dynamic reliability analysis of structural resistance deterioration process as well as the existing reliability expressions. For the design service life of 50 years, considering three load combinations and five ratios of variable load to permanent load effect, the value of structural durability parameter yD is determined according to different environmental conditions, water-cement ratios and concrete cover thicknesses. Consequently, the practical reliability design method based on durability is established.