钢纤维对混凝土单轴受压损伤本构模型的影响

发布时间：2018-04-27 08:10

本文选题：Weibull分布 + 纤维因子　；参考：《建筑材料学报》2015年02期

【摘要】：基于Weibull统计分布理论和等效应变假设,推导出纤维混凝土(SFRC)受压损伤本构模型.为更好地描述钢纤维对混凝土受压损伤的影响,模型中引入考虑纤维体积分数与纤维几何特征的纤维因子.结合纤维混凝土单轴受压试验数据,对模型中的参数进行修正,并将修正后的理论曲线与试验曲线进行比较.为验证模型的有效性,分别选取压应变为1.5εpk,2.0εpk处的压应力试验值与预测值进行对比.结果表明:理论曲线与试验曲线吻合较好,该模型在压应变为0~1.5εpk时可有效地描述单轴受压状态下纤维混凝土的损伤扩展过程以及纤维对峰值应力后的混凝土受压性能的改善作用.
[Abstract]:Based on the Weibull statistical distribution theory and the equivalent strain hypothesis, the compressive damage constitutive model of fiber reinforced concrete (SFRC) is derived. In order to better describe the effect of steel fiber on the compressive damage of concrete, the fiber factor, which takes into account the fiber volume fraction and fiber geometry characteristics, is introduced into the model. Based on the uniaxial compression test data of fiber reinforced concrete, the parameters of the model are modified, and the modified theoretical curve is compared with the experimental curve. In order to verify the validity of the model, the compressive stress test values of 1.5 蔚 PKG 2.0 蔚 competition were selected to compare with the predicted values. The results show that the theoretical curve is in good agreement with the experimental curve. The model can effectively describe the damage propagation process of fiber reinforced concrete under uniaxial compression and the effect of fiber on the compressive performance of concrete under peak stress when the compressive strain is 0 ~ 1.5 蔚.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金资助项目(51078058)
【分类号】：TU528.572

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