西安建筑科技大学学报(自然科学版)

编写MATLAB代码随机生成基于塑性损伤本构关系的随机骨料程序确定骨料的位置信息,针对再生骨料混凝土的损伤演化,从细观角度上认为再生骨料混凝土由多相材料夹杂而成并考虑其不同材料之间的层间效应,利用有限元软件DIANA分别建立二维再生随机骨料混凝土模型和多尺度耦合再生骨料混凝土梁模型,研究了单轴拉伸压缩下混凝土裂缝开展路径以及应力应变关系,并与已有实验结果进行比较,分析了三点受弯下不同骨料取代率再生混凝土梁的断裂行为.所建立的多尺度数值模型为再生骨料混凝土材料及结构分析提供了可行的研究途径.

MATLAB code was written to randomly generate random aggregate program based on plastic damage constitutive relation to determine the position information of aggregate. In view of the damage evolution of recycled aggregate concrete, it was considered from the mesoscopic point of view that recycled aggregate concrete was composed of multiphase materials. Considering the interlayer effect between different materials, two-dimensional recycled random aggregate concrete model and multi-scale coupled recycled aggregate concrete beam model were established respectively by using finite element software DIANA. The crack development path and stress-strain relationship of concrete under uniaxial tensile and uniaxial compression were studied and compared with the existing experimental results, and then, the fracture behavior of recycled concrete beams with different aggregate replacement ratios under three-point bending was analyzed. The established multi-scale numerical model can provide a feasible research approach for the material and structural analysis of recycled aggregate concrete.

引言
1 再生骨料混凝土细观模型
2 再生骨料混凝土分析
3 多尺度再生骨料混凝土梁数值模拟分析
4 结论

表1 各相材料参数<br/>Tab.1 Material parameters of each phase

表1 各相材料参数
Tab.1 Material parameters of each phase

图1 再生骨料混凝土网格模型<br/>Fig.1 Recycled aggregate concrete grid model

图1 再生骨料混凝土网格模型
Fig.1 Recycled aggregate concrete grid model

图2 单轴压缩下应力-应变关系<br/>Fig.2 Stress-strain relationship under uniaxial compression

图2 单轴压缩下应力-应变关系
Fig.2 Stress-strain relationship under uniaxial compression

图3 单轴拉伸下应力-应变关系<br/>Fig.3 Stress-strain relationship under uniaxial tension

图3 单轴拉伸下应力-应变关系
Fig.3 Stress-strain relationship under uniaxial tension

图4 单轴拉伸下随机骨料模型<br/>Fig.4 Random aggregate model under uniaxial tension

图4 单轴拉伸下随机骨料模型
Fig.4 Random aggregate model under uniaxial tension

图5 单轴压缩下随机骨料模型<br/>Fig.5 Random aggregate model under uniaxial compression

图5 单轴压缩下随机骨料模型
Fig.5 Random aggregate model under uniaxial compression

图6 受拉情况下再生骨料混凝土裂缝开展<br/>Fig.6 Crack development of recycled aggregate concrete under tension

图6 受拉情况下再生骨料混凝土裂缝开展
Fig.6 Crack development of recycled aggregate concrete under tension

图7 受压情况下再生骨料混凝土裂缝开展<br/>Fig.7 Crack development of recycled aggregate concrete under compression

图7 受压情况下再生骨料混凝土裂缝开展
Fig.7 Crack development of recycled aggregate concrete under compression

图8 模拟结果与试验结果-应力应变关系<br/>Fig.8 Simulation results and test results-stress-strain relationship

图8 模拟结果与试验结果-应力应变关系
Fig.8 Simulation results and test results-stress-strain relationship

图9 多尺度再生骨料混凝土梁网格模型<br/>Fig.9 Multi-scale recycled aggregate concrete beam grid model

图9 多尺度再生骨料混凝土梁网格模型
Fig.9 Multi-scale recycled aggregate concrete beam grid model

图10 三弯点加载方式随机骨料模型荷载以及约束方式<br/>Fig.10 Load and restraint method of random aggregate model under three points bend loading mode

图10 三弯点加载方式随机骨料模型荷载以及约束方式
Fig.10 Load and restraint method of random aggregate model under three points bend loading mode

图11 多尺度再生骨料混凝土梁荷载-位移曲线<br/>Fig.11 Load-displacement curve of Multi-scale recycled aggregate concrete beam

图11 多尺度再生骨料混凝土梁荷载-位移曲线
Fig.11 Load-displacement curve of Multi-scale recycled aggregate concrete beam

图12 受弯情况下不同取代率下的再生骨料混凝土裂缝开展对比(Ecw1表示裂缝宽度)<br/>Fig.12 Comparison of crack development of recycled aggregate concrete with different replacement rates under compression(Ecw1 represents the crack width)

图12 受弯情况下不同取代率下的再生骨料混凝土裂缝开展对比(Ecw1表示裂缝宽度)
Fig.12 Comparison of crack development of recycled aggregate concrete with different replacement rates under compression(Ecw1 represents the crack width)

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备注

引言

1 再生骨料混凝土细观模型

2 再生骨料混凝土分析

3 多尺度再生骨料混凝土梁数值模拟分析

4 结论

期刊信息