西安建筑科技大学学报(自然科学版)

将再生混凝土看作由原生骨料、老砂浆基体、老界面区、新砂浆基体、新界面区组成的三维细观结构,运用具有动态语义特征的PYTHON语言编写基于蒙特卡罗法生成三维再生混凝土随机骨料模型的算法,通过PYTHON操纵ABAQUS软件内核,实现模型构建与数值分析的合理整合,采用该算法建立四种不同骨料含量的三维再生混凝土随机骨料模型,并对45%骨料含量的模型力学性能进行了数值计算分析. 结果表明:通过PYTHON建立的三维再生混凝土随机骨料模型与真实再生混凝土中骨料的随机性和投放率的切片细观结构相符合; 三维再生骨料模型的力学性能指标与试验结果吻合较好; 该方法较好地解决了构建再生混凝土三维随机骨料模型的技术难题,满足工程应用的需要.

A three-dimensional meso-structure model of recycled concrete is proposed which is composed of five-phase materials of newly hardened mortar, old hardened mortar, internal interface zone, external interface zone and natural aggregate. Using Python language with dynamic semantic features, an algorithm to generate three-dimensional recycled concrete random aggregate model is compiled based on Monte Carlo method. The kernel program of Abaqus software is manipulated by the algorithm to realize the reasonable integration of the model construction and numerical analysis. Three-dimensional recycled concrete random aggregate models are built with the above method based four different aggregate percent. The mechanical properties of the model with 45% aggregate percent are simulated and analyzed. The results show that the three-dimensional model established with Python is in good agreement with the real microstructure of recycled concrete. This method can meet the requirements of the aggregate generation randomness and the aggregate generation input rate. The mechanical properties of the model are in good agreement with the test results. This method is better able to solve the problem of constructing a three-dimensional random aggregate model of recycled concrete and can meet the needs of engineering applications.

引言
1 再生混凝土三维细观结构构建
2 再生混凝土三维模型程序研发
3 再生混凝土细观性能模拟计算
4 结论

图1 再生混凝土细观结构模型<br/>Fig.1 Microstructure model of recycled concrete

图1 再生混凝土细观结构模型
Fig.1 Microstructure model of recycled concrete

图2 设计流程
Fig.2 Design process

图3 不同骨料含量模型<br/>Fig.3 Different recycled aggregate models

图3 不同骨料含量模型
Fig.3 Different recycled aggregate models

表1 材料参数[14]<br/>Tab.1 Material parameters

表1 材料参数[14]
Tab.1 Material parameters

图4 模型荷载施加<br/>Fig.4 Model load application

图4 模型荷载施加
Fig.4 Model load application

图5 应力-应变曲线<br/>Fig.5 Stress-strain curves

图5 应力-应变曲线
Fig.5 Stress-strain curves

图6 单轴受压时应力和损伤状态<br/>Fig.6 Stress and damage state under uniaxial compression

图6 单轴受压时应力和损伤状态
Fig.6 Stress and damage state under uniaxial compression

图7 单轴受拉时应力和损伤状态<br/>Fig.7 Stress and damage state during uniaxial tension

图7 单轴受拉时应力和损伤状态
Fig.7 Stress and damage state during uniaxial tension

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备注

引言

1 再生混凝土三维细观结构构建

2 再生混凝土三维模型程序研发

3 再生混凝土细观性能模拟计算

4 结论

期刊信息