大跨度PC斜拉桥收缩和徐变变形分析的研究

Analysis on the Contraction and Time Deformation of Long-spanned PC Cable-stayed Bridges

文章以荆州长江大桥(一座主跨为500 m的PC斜拉桥)为例介绍了PC斜拉桥静力变形监测数据的采集方法,通过分析温度变形,剔除实测变形中的温度影响,得到因混凝土材料的收缩徐变而导致的结构变形。进一步按桥梁规范的计算模型和计算参数得到的收缩徐变影响的理论计算值得到了桥梁健康监测结果较好的验证。这对于大跨度PC斜拉桥的设计、施工和成桥后的计算分析具有重要的意义和作用。

The paper, taking as an example Jinzhou Yangtze River Bridge, a PC cable-stayed bridge with the main span of 500 meters, introduces monitoring data collection of static deformation, and after analyzing temperature deformation, the influence of temperature is excluded in measuring deformation and the structure deformation is caused by the contraction and time deformation of concrete materials. The monitoring result of the bridge health is proved by the theoretical calculated values influenced by time deformation achieved from the computation models and parameters of bridge specifications, which is of great significance for the design, construction and computation analysis of long-spanned PC cable-stayed bridges.