混凝土收缩徐变预测模型的分析比较

Analysis and Comparison of Prediction Models for Concrete Shrinkage and Creep

提高对混凝土收缩徐变的长期预测精度,是大跨度桥梁设计中要解决的一个关键问题。通过从模型建立的机理、影响因素的考虑、预测精度的比较以及通过短期试验确定预测模型中材料参数的可行性与可靠性等方面对常用的5种收缩徐变模型进行了比较,得出一些有益的结论。

Improving the prediction accuracy of the long-term concrete shrinkage and creep is a critical problem that needs to be resolved in the design of long-span concrete bridges. Five commonly-used prediction models for concrete shrinkage and creep are compared and analyzed from aspects of the mechanism of prediction model establishment, considerations of the related influential factors, comparison of prediction accuracy, and the feasibility and reliability of determining the material parameters in the prediction models through short-term tests. From the comparison and analysis, some helpful conclusions are generalized.