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基于应变等效原理与钢纤维再生砖骨料混凝土(SFRBC)微元强度服从Weibull统计分布的规律,建立了SFRBC的统计损伤本构模型.为更好地反映SFRBC实际受压情况,考虑材料残余强度修正系数与损伤应变阈值对模型的影响.基于分布参数模型曲线,拟合出考虑纤维掺量的纤维因子与分布参数的表达式,得出了以纤维因子为变量的统计损伤本构曲线,并与试验结果进行对比.结果表明:修正后的理论曲线与试验曲线符合较好,能有效反映钢纤维掺量的增加、SFRBC的韧性增强及宏观平均强度提高等特点.通过分析SFRBC的累计损伤演化过程可知:纤维掺量的增加可有效延缓SFRBC在峰后的累计损伤发展以及损伤发展速率,模型曲线的下降度应变硬化明显,其韧性及延性随纤维掺量的增加而得到不同程度的增强.
The statistical damage constitutive model of SFRBC was established based on the principle of strain equivalence and the strength of SFRBC micro-element obeying Weibull statistical distribution.In order to better reflect the actual compression of SFRBC, the material residual Strength correction coefficient and damage strain threshold on the model.According to the distribution parameter model curve, the expression of the fiber factor and the distribution parameter considering the fiber content is fitted out, the statistical damage constitutive curve with the fiber factor as the variable is obtained, The results show that the corrected theoretical curve is in good agreement with the experimental curve, which can effectively reflect the increase of steel fiber content, the toughness of SFRBC and the increase of macroscopic average strength.Through analyzing the cumulative damage of SFRBC The evolution process shows that the increase of fiber content can effectively delay the cumulative damage development and the rate of damage development of SFRBC after peak, and the strain hardening of the model curve is obvious. The ductility and ductility of the SFRBC increase with the increase of fiber content to some extent .