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为了建立物理意义明确、结果合理、精度较高的高性能混凝土(HPC)早龄期拉伸徐变的预测方法和公式,贡献于高精度的应力解析、早期开裂预测和裂缝控制,本研究在深入分析已有徐变模型的基础上,考虑硬化过程中HPC的物性发展特征,建立了硬化期间HPC拉伸徐变的预测式;通过大量实验数据的拟合和优化获得了预测式中的诸项待定参数,最后通过验证实验考察了该预测式的可靠性和精度。结果发现预测式计算值与验证实验获得的实测值吻合良好,二者之间的误差小于10%。可以认为,该研究以基本力学性能、加载龄期、初始应力强度比等为参数所建立的早龄期拉伸徐变预测式能较可靠地预测硬化过程中HPC的拉伸徐变。
In order to establish high-performance concrete (HPC) early age tensile creep prediction method and formula with clear physical meaning, reasonable result and high accuracy, which contribute to high-precision stress analysis, early cracking prediction and fracture control, Based on the analysis of the existing creep model, the property development of HPC during the hardening process is considered, and the predicting formula of the tensile creep of HPC during the hardening process is established. By the fitting and optimization of a large number of experimental data, Term to be determined parameters, and finally verified the reliability and accuracy of the predictive formula through the verification experiment. The results show that the predicted value is in good agreement with the measured value of the verification experiment, and the error between the two is less than 10%. It can be considered that this study predicts the tensile creep of the HPC during the hardening process based on the basic mechanical properties, loading age and initial stress intensity ratio as the parameters.