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在正常使用条件下 ,钢筋混凝土受弯构件抗力的衰减 ,主要是由于钢筋腐蚀造成的 ,在考虑抗力随时间变化的情况下 ,结构在设计基准期内的可靠性下降。在氯盐环境下导致钢筋腐蚀的主要原因是氯离子侵蚀 ,本文通过试验确定了水灰比与氯离子扩散系数之间的统计关系 ,在此基础上以浪溅区的钢筋混凝土受弯构件为例 ,分析了混凝土保护层厚度、水灰比、设计基准期等与耐久性有关的非承载力因素对设计基准期内结构可靠性的影响
Under normal conditions of use, the resistance degradation of flexural members of reinforced concrete is mainly due to the corrosion of steel bars. The reliability of the structure during the design reference period is reduced when considering the change of resistance with time. In chloride environment, corrosion of steel is mainly caused by chloride ion erosion. In this paper, the statistical relationship between water-cement ratio and chloride diffusion coefficient is determined through experiments. Based on this, Example, the impact of non-bearing capacity factors such as concrete cover, water-cement ratio, design reference period and durability on structural reliability during design reference period