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基于像素网格法的再生混凝土弹性性能细观分析

Meso-scale Analysis of Elastic Properties of Recycled Concrete Based on Pixel Grid Method
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摘要 基于考虑了再生骨料及其内部天然骨料随机分布的再生混凝土二维细观模型,采用与蒙特卡罗法相结合的有限元方法,通过MATLAB编程仿真实现了再生混凝土弹性问题的数值模拟。利用像素网格法避免了骨料间距离较近时网格划分的困难,试验结果验证表明,此方法在保证计算精度的情况下提高了计算效率。进一步研究了再生骨料及其内部天然骨料随机分布、骨料含量、骨料级配及骨料种类对于再生混凝土弹性性能的影响。结果表明,骨料随机分布是造成再生混凝土弹性性能随机性的重要因素;再生混凝土弹性参数均值随着骨料含量、骨料等效弹性参数的增大而增大,骨料级配对于弹性参数的影响不明显;弹性参数的变异性随着骨料含量、再生骨料与新砂浆弹性参数间差异、骨料粒径的增大而增大,但在实际工程中可忽略骨料含量的影响。 Based on the two - dimensional meso - scale model of recycled concrete with random distribution of recycled aggregates and inside natural aggregates, the finite element method com-bined with Monte Carlo method was used to simulate the elastic-ity of recycled concrete in MATLAB. The pixel grid method was used to avoid the difficulty of meshing when the distance between the aggregates m small, and experimental results proved that it can improve the computing efficiency under enough preci-sion. The effects of the random distribution of recycled aggregates and inside natural aggregates, the content of aggregate, the aggregate gradation and the aggregate type on the elastic properties of recycled concrete were studied. The results showed that the ran-dom distribution of aggregates is an important factor in elastic properties of recycled concrete. The mean value of elastic param-eters of recycled concrete increases with the increase of the elas-tic properties of aggregate and the content of aggregate. The varia-bility of the elastic parameters increases with the increase of the aggregate content, the difference of the elastic parameters be-tween the recycled aggregate and the new mortar, and the in-crease of the aggregate size.
出处 《四川建材》 2017年第3期1-3,共3页 Sichuan Building Materials
基金 国家自然科学基金项目(10972162)
关键词 再生混凝土 弹性性能 像素网格法 细观数值模拟 随机分布 recycled concrete elastic property pixel grid method meso - scale numerical simulation random distribution
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