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根据不同冻融循环次数下的混凝土应力—应变全曲线特性,研究了损伤变量的变化规律,并建立了冻融后混凝土损伤演化方程,探讨了损伤阈值对混凝土冻融损伤本构模型的影响。将统计学方法与细观力学方法结合,采用平行杆模型模拟混凝土等脆性材料单轴受压的损伤演化规律,在传统的两参数Weibull分布函数基础上引入损伤阈值参数,提出了考虑塑性变形的混凝土损伤本构方程。该模型可以较好地反应混凝土在受载初期时的力学特性。结合试验结果,求解出模型中的参数,并与试验结果对比分析,验证了所提出模型的合理性。
The variation law of damage variables was studied according to the characteristics of full stress-strain curve of concrete under different freeze-thaw cycles. The damage evolution equation of concrete after freezing-thawing was established and the influence of damage threshold on the freeze-thaw damage constitutive model of concrete was also discussed. Based on the traditional two-parameter Weibull distribution function, the damage thresholds are introduced based on the parallel rod model to simulate the damage evolution of uniaxial compression of brittle materials, such as concrete. The plastic deformation Concrete damage constitutive equation. The model can better reflect the mechanical properties of concrete at the initial stage of loading. Combined with the test results, the parameters in the model were solved and compared with the test results to verify the rationality of the proposed model.