混凝土徐变是造成大跨度预应力混凝土连续刚构桥跨中下挠的主要原因,笔者从徐变模型出发,综合比较了中国公路新旧桥规徐变模型的差异,以某二级公路上的一座特大桥为项目背景建立有限元模型,进行实例分析计算,同时比较了不同加载龄期对长期下挠的影响。计算结果对大跨连续刚构桥长期下挠的分析具有一定借鉴作用。 Concrete creep is the main reason for the span-to-mid-span deflection of long-span prestressed concrete continuous rigid-frame bridges. Based on the creep model, the author compares the differences between the new and old bridge gauge creep models in China. A large bridge for the project background to establish a finite element model for example analysis and calculation, while comparing the different loading age on the long-term deflection. The calculation results have some reference to the long-term deflection of long-span continuous rigid frame bridge.