论文部分内容阅读
以8根不同掺量的高性能粉煤灰混凝土无黏结预应力梁的收缩徐变试验为基础,提出了从混凝土模型梁短期试验值推算相应混凝土梁在该桥梁工作环境下收缩应变及徐变系数的方法,进而得出桥梁的徐变长期效应计算式;结合桥梁规范JTG D62—2004中收缩模型与徐变模型的思想,得出计算混凝土桥梁收缩应变及徐变系数的修正公式。该公式预测值与试验结果的比较表明:预测值具有较好的精度,且该预测方法不需做材料的收缩徐变试验,亦避免了从标准环境下用试验值推算桥梁工作环境下收缩徐变可能产生的误差。
Based on the shrinkage and creep tests of 8 prestressed concrete beams with different contents of high performance fly ash, this paper proposes the calculation of the shrinkage and creep of the corresponding concrete beams under the working conditions of the bridge from the short-term test values of the concrete model beams Coefficient, and then calculate the creep long-term effect of the bridge. Combining with the shrinkage model and the creep model in JTG D62-2004, a modified formula for calculating the shrinkage strain and creep coefficient of the concrete bridge is obtained. The comparison between the predictive value of the formula and the test result shows that the predicted value has better accuracy and the prediction method does not need to do the shrinkage and creep test of the material and avoids the shrinkage and creep test of the bridge under the standard environment from the experimental values Possible error.