摘要
对长期观测的混凝土收缩徐变试验结果与不同规范模型的预测结果进行对比分析。研究结果表明:在恒温恒湿环境下,收缩徐变在前期发展较快,后期逐渐变缓,270 d后变化较小;长期观测的混凝土收缩徐变试验结果与不同规范模型的预测结果存在差异,CEB—FIP(1990)模型预测混凝土收缩应变和ACI 209R(1992)模型预测混凝土徐变系数的整体效果较好,而ACI 209R(1992)模型的收缩应变预测值和JTJ 023—85模型的徐变系数预测值与试验结果偏离较大。根据混凝土收缩徐变试验结果,引入混凝土收缩修正系数和徐变修正系数对JTG D62—2004预测模型进行修正,构建恒温恒湿环境下混凝土收缩应变、徐变系数的修正预测模型,提高混凝土收缩徐变预测模型的预测精度。
Experimental results of concrete shrinkage and creep of long-term observation and prediction values of different code models were compared and analyzed. The results show that according to the results of research, shrinkage and creep increased faster in the early period of experiment and gradually slower later in the environment with constant temperature and humidity. The change becomes smaller after 270 d. There is difference between experimental results of concrete shrinkage and creep of long-term observation and prediction values of different code models. The prediction of concrete shrinkage strain by CEB—FIP（1990） model and prediction of concrete creep coefficient by ACI 209R（1992） model are relatively more accurate. Prediction values of concrete shrinkage strain by ACI 209R（1992） model andconcrete creep coefficient by JTJ 023—85 model have a larger deviation from experimental results. Correction coefficients of concrete shrinkage and creep are introduced to modify JTG D62—2004 model based on experimental results. Correction prediction models of concrete shrinkage strain and creep coefficient are constructed with constant temperature and humidity, which can improve the predictive accuracy of prediction model of concrete shrinkage and creep.
作者
韩伟威
吕毅刚
HAN Weiwei LU Yigang(State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science ＆ Technology, Changsha 410114, China School of Traffic and Transportation Engineering, Changsha University of Science ＆ Technology, Changsha 410114, China Hunan Province Engineering Laboratory of Bridge Structure, Changsha University of Science ＆ Technology, Changsha 410114, China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第10期3515-3522,共8页
Journal of Central South University:Science and Technology
基金
长沙理工大学公路养护技术国家工程实验室开放基金资助项目(kfj140110)
长沙理工大学桥梁结构安全控制湖南省工程实验室开放基金资助项目(14KD13)
湖南交通科技进步与创新项目(201330)
国家重点基础研究发展计划(973计划)项目(2015CB057705)~~
关键词
混凝土
收缩
徐变系数
预测模型
修正系数
concrete
shrinkage
creep coefficient
prediction model
correction coefficient
