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根据预应力混凝土结构的耐久性特点,分别定义了结构构件在碳化环境和氯离子侵蚀环境下的耐久性极限状态,建立了以可靠性数学和随机过程为理论基础的数学模型,并对耐久性失效概率进行了理论分析.提出了碳化环境下的预应力混凝土结构构件的耐久性实用设计方法.计算结果表明:预应力混凝土结构的耐久性优于传统钢筋混凝土结构;现行国家规范(GB50010—2002)中规定的混凝土保护层厚度是不足的;根据碳化和氯离子侵蚀环境的不同,混凝土保护层厚度应该分别不小于35mm和45mm.
According to the durability characteristics of prestressed concrete structures, the durability limit state of structural members in carbonized environment and chloride ion eroded environment are respectively defined. The mathematical model based on reliability mathematics and stochastic process is established, and the durability The probability of failure is theoretically analyzed.The practical design method for durability of prestressed concrete structural members under carbonation environment is proposed.The calculation results show that the durability of prestressed concrete structures is superior to the traditional reinforced concrete structure.The current national standard (GB50010-2002 ) Of the thickness of the concrete cover is insufficient; according to the carbonation and chloride ion erosion of the environment, the thickness of the concrete cover should be not less than 35mm and 45mm respectively.