千岛湖大桥钢管混凝土拱桥拱肋混凝土徐变效应研究

Research on Concrete Creep Effect of CFST Arch Rib Concrete of Qiandao Lake Bridge

结合千岛湖大桥施工及成桥的长期监测项目,通过实测数据分析,探讨了大跨径钢管混凝土拱结构的徐变效应问题。提出了实测弹性计算比的概念,根据该指标的分析,总结出四肢格构式钢管混凝土拱结构的长期受力状态和规律。这些结论和分析方法无论是对于钢管混凝土拱的徐变分析,还是大跨径钢管混凝土的拱桥设计,都提供了有益的参考。

Combined with the construction and the long-term monitoring project of the Qiandao Lake Bridge, the creep effect of long span concrete-filled steel tubular （CFST） arch bridge structure is discussed through measured data, the concept of the ratio of measurement and elastic calculation is proposed and then the long-term stressing condition and rule of the four-limb trellis type CFST arch structure are summarized according to that target analysis. In a word, these conclusions and analysis method provide beneficial reference either to the creep analysis of CFST arch structures or to the design of long span CFST arch bridge structures.