高性能混凝土早龄期拉伸徐变预测  

Tensile Creep Prediction of HPC at Early Ages

作　　者：杨杨[1] 江晨晖[2] 叶德艳[1] 许四法[1] 孔德玉[1] 

机构地区：[1]浙江工业大学建筑工程学院,杭州310032 [2]浙江建设职业技术学院建工系,杭州311231

出　　处：《武汉理工大学学报》2009年第7期77-80,共4页Journal of Wuhan University of Technology

基　　金：浙江省自然科学基金(Y106856)

摘　　要：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。For the purpose of evaluating risks of pre-mature cracking and subsequent control of crack in concrete structure, exact prediction model and formula of early-age tensile creep is one of indispensable prerequisite. A prediction formula on tensile basic creep, which takes into account the effects of fundamental mechanical properties at early ages, age at loading and initial stress-strength ratio and so forth, is built by modifying previous classical creep models and with material behavior of hardening HPC, and a set of the parameters in the formula are obtained by fitting a great deal of experimental data. The reliability and precision of the formula are verified by means of comparing predict values and experimental data of tensile creep. As a conclusion, the proposed prediction formula can be used for predicting tensile basic creep of hardening HPC effectively and exactly.

关 键 词：HPC 早龄期 拉伸徐变 预测式 加载龄期 初始应力强度比 

分 类 号：TU528[建筑科学—建筑技术科学]