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针对早龄期混凝土的蠕变松弛特性,以配比、强度以及不同加载龄期的混凝土蠕变试验数据为依据,对比研究了CEB-FIP模型、Muller模型、B3模型与笔者所建立变系数四参数Burgers模型的蠕变预测差异。研究结果表明:常用经验模型中,CEB-FIP模型具有较好的适应性,Muller模型对于高强混凝土的蠕变预测较好,基于固化理论的B3模型对于早龄期混凝土的蠕变预测值偏大,准确性较差。对比研究验证了变系数四参数Burgers模型中参数的物理意义与经验取值范围及其合理性与适用性。
According to the creep relaxation characteristics of early age concrete, the CEB-FIP model, Muller model and B3 model are compared with the creep test data of concrete with different mixing ratio, strength and loading age. Creep Prediction Difference of Four Parameters Burgers Model. The results show that: CEB-FIP model has good adaptability in common experience model, Muller model is better for creep prediction of high-strength concrete, B3 model based on solidification theory for early age concrete creep prediction value is too large , Less accurate. The comparative study verifies the physical meaning, the range of experience and the rationality and applicability of the parameters in the variable coefficient four parameter Burgers model.