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通过分析混凝土强度、名义徐变系数、环境相对湿度、环境温度和预应力荷载等徐变参数的变异性及其概率统计特征,探明了徐变参数的随机扰动对混凝土徐变系数的影响规律。通过对跨径布置为85m+130m+85m的预应力混凝土连续梁桥进行徐变变形分析,明确了不同随机性徐变参数对预应力混凝土桥梁主跨跨中挠度的影响,获得了预应力混凝土桥梁10年期间的跨中挠度变异系数、均值及95%置信区间值。结果表明,徐变参数随机性对混凝土桥梁徐变系数具有重要的影响作用,通过控制随机性置信区间上下限值可达到控制混凝土桥梁长期变形的目的,研究成果具有重要的工程应用价值。
By analyzing the variability of creep parameters such as concrete strength, nominal creep coefficient, relative humidity, ambient temperature and prestressing load, as well as their probability and statistical characteristics, the influence of random perturbation of creep parameters on creep coefficient of concrete . Through the analysis of creep deformation of prestressed concrete continuous girder bridge with span of 85m + 130m + 85m, the effect of different random creep parameters on the mid-span deflection of main span of prestressed concrete bridge is clarified. The influence of prestressed concrete Mid-span deflection variation coefficient, mean value and 95% confidence interval value of bridges over a 10-year period. The results show that the randomness of creep parameters plays an important role in the creep coefficient of concrete bridges. The purpose of controlling the long-term deformation of concrete bridges can be achieved by controlling the upper and lower bounds of the confidence interval of randomness. The research results have important engineering application value.