混凝土收缩徐变B3模型的修正与验证  

Modification and verification of model B3 for shrinkage and creep of concrete

作　　者：齐金振 朱劲松[1,2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《河北工业大学学报》2016年第3期100-108,共9页Journal of Hebei University of Technology

基　　金：国家自然科学基金(51178305);天津市应用基础与前沿技术研究计划(14JCYBJC21500)

摘　　要：对国际上认可程度较高的B3模型进行了形式的修正,解决了其含有不可积分系数、不能进行连续计算的弊端,给出了混凝土收缩徐变修正模型表达式.使用控制变量法分析了影响混凝土收缩徐变各因素的敏感度,并利用多组试验数据对修正模型进行了验证.结果表明:对于徐变系数而言,修正公式所得结果与B3公式所得结果趋势一致,数值差别不大,且修正公式所得结果与试验实测值更接近,其拟合效果要优于JTG D62-2004模型;对于收缩应变而言,修正公式所得结果与B3公式所得结果趋势一致,且数值差别不大.Based on the B3 model with a high degree of recognition in the world, a modified model of shrinkage and creep of concrete is given. This has solved the problem that contains an integral coefficient and can not be calculated continuously. Using the method of controlling variables, the sensitivity of the factors that affect the shrinkage and creep of concrete are qualitatively analyzed. In this paper, the modified model is verified by multiple sets of experimental data. From the contrast, we can see that the result of modified formula is consistent with the trend of B3 formula, and the numerical value has little difference; the modified formula results are more close to the measured values, and the fitting effect is better than JTG D62-2004 model when it comes to the creep coefficient. For the shrinkage strain, the results of modified formula and B3 formula are consistent. And the numerical value has little difference.

关 键 词：混凝土 收缩徐变 B3模型 修正模型 

分 类 号：TU312[建筑科学—结构工程]