摘要
在细观数值模拟时,水工混凝土可认为是由骨料、砂浆、界面和分布在界面单元中的初始缺陷四相材料组成,缺陷单元分布在界面单元中且符合蒙特卡洛随机分布规律.通过对不同形状的混凝土随机骨料模型进行细观数值模拟,可知骨料形状对细观结构计算的结果影响不明显,当缺陷单元数量是界面单元总数的1%时,随机多边形骨料模型的计算结果与试验结果最为接近.探讨混凝土内部初始缺陷含量对混凝土抗拉强度的影响,有利于在细观层次揭示混凝土宏观力学参数的非线性问题.
At the mesoscopic numerical sisulation,the hydraulic concrete is composed of four-phase materials,i.e.aggregate,mortar,interfacial transition zone（ITZ）and the initial defects,accordance with Monte Carlo random distribution in the ITZ.By simulating the random aggregate model of concrete with different shapes,it is found that the aggregate shape has little effect on the results of the fine structure calculation.When the number of the initial defects is 0.0 1 times of the total number of ITZ elements,the results of random polygon agree well with the experimental results.To investigate the influence of the content of initial defects on the tensile strength,which is helpful to reveal the nonlinear problem of macromechanical parameters of concrete at the mesoscopic level.
出处
《三峡大学学报（自然科学版）》
CAS
2016年第3期41-44,共4页
Journal of China Three Gorges University：Natural Sciences
基金
湖北省科技支撑计划项目(2015BCE079)
三峡大学研究生创新基金(2015032808)
关键词
水工混凝土
初始缺陷
单轴受拉
数值模拟
hydraulic concrete
initial defects
uniaxial tension
numerical simulation
