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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.
The B3 model, which has a high degree of international acceptance, has been formally revised to solve the drawbacks of non-integral coefficients that can not be calculated continuously and the expression of modified model for shrinkage and creep of concrete is given. The influence of influence Concrete shrinkage and creep, and verify the correction model by using a plurality of sets of experimental data.The results show that for the creep coefficient, the results obtained by the modified formula are consistent with the results obtained by the B3 formula, the difference is not significant, The results obtained by the modified formula are closer to the experimental ones, and the fitting results are better than the JTG D62-2004 model. For the shrinkage strain, the result obtained by the modified formula is consistent with that obtained by the B3 formula, and the difference is not significant.