沈海高速公路辽宁段沿线桥梁混凝土碳化概率特征研究

对沈海(沈阳—海口)高速公路辽宁段沿线混凝土桥梁的碳化实测数据进行了统计分析，建立了以混凝土抗压强度和时间为主要参数的不同地区桥梁和单个桥梁混凝土碳化深度的随机过程模型。将混凝土碳化到钢筋表面的状态作为大气环境中的耐久性极限状态，分析了沿线上海湾大桥不同服役时间的耐久性失效概率。结果表明:混凝土碳化深度随混凝土抗压强度的增大而减小，但受多种复杂因素影响，混凝土碳化深度离散性很大；混凝土碳化系数计算模型的不确定性系数服从对数正态分布；海湾大桥混凝土使用到第100年时的耐久性失效概率小于10%。

Study on Probability Characteristics of Concrete Carbonation for Bridges of Shenyang-Haikou Highway in Section of Liaoning Province

Statistical analysis for concrete carbonation data acquired from bridges on Shenhai (Shenyang-Haikou) highway in section of Liaoning province was carried out, and stochastic process models regarding compressive strength of concrete and time as main parameters for bridges in different regions and individual bridge were developed. Taking the state of concrete carbonization to the surface of the reinforcement as the assumed durability limit state in the atmospheric environment, the durability failure probabilities of Haiwan bridge under different service time were analyzed. The results show that the carbonation depth of concrete decreases with increase of the compressive strength of concrete, but the carbonation depth has large discreteness due to various complex factors. The model uncertainty of concrete carbonation coefficient follows logarithmic normal distribution. The durability failure probability of Haiwan bridge is less than 10% at expire time of 100 years.