毕继红1,2?覮,赵云1,鲍春3,霍琳颖1,王照耀1,乔浩玥1.不同体积掺量的钢纤维在混凝土中的分布研究[J].湖南大学学报:自然科学版,2021,(3):99~108
不同体积掺量的钢纤维在混凝土中的分布研究
Research on Distribution of Steel Fiber with Different Volume Content in Concrete
  
DOI:
中文关键词:  纤维体积掺量  纤维分布  纤维取向  混凝土的流变性  数值模拟
英文关键词:fiber volume content  fiber distribution  fiber orientation  rheological properties of concrete  numerical simulation
基金项目:
作者单位
毕继红1,2?覮,赵云1,鲍春3,霍琳颖1,王照耀1,乔浩玥1 (1. 天津大学 建筑工程学院天津 3000722. 天津大学 滨海土木工程结构与安全教育部重点实验室天津 300072 3. 天津市市政工程设计研究院天津 300392) 
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中文摘要:
      为研究不同体积掺量的钢纤维对钢纤维自密实混凝土中纤维分布和取向的影响,配制了4种不同纤维体积掺量的纤维自密实混凝土,首先探究了新拌混凝土的流变性质与纤维体积掺量之间的关系,同时分析了梁试件切割面上的纤维分布. 考虑纤维体积掺量对新拌混凝土流变性质的影响,采用ANSYS CFX软件模拟了具有4种不同纤维体积掺量的新拌混凝土的流动. 基于模拟得到的混凝土速度场,将纤维视为刚性连接的数个球形粒子,通过求解刚体动力学方程计算了纤维的运动. 通过与试验结果对比发现,本文提出的模拟方法能较好地确定纤维在混凝土中的分布与取向;模拟结果表明,随着纤维体积掺量的增加,纤维在梁竖直方向的离析程度减小,相反地,纤维与梁轴向的取向角度增大.
英文摘要:
      In order to investigate the influence of steel fiber content on fiber distribution and orientation in steel fiber reinforced self-compacting concrete,four kinds of concretes were prepared using four different fiber volume contents. The relationship between rheological properties of fresh concrete and fiber volume content was investigated and the fiber density in the cut planes of beam specimens was analyzed. The flow of fresh concrete with four different fiber volume contents was simulated by ANSYS CFX,where the effect of fiber volume content on the rheological properties was considered. Based on the velocity field of concrete obtained by simulation,the fiber is simplified as a number of particles that are rigidly connected and the motion of fibers is calculated by solving the rigid body dynamics equation. Through comparison between the experimental results,it is found that the proposed simulation method can determine the distribution and orientation of fiber immersed in the concrete. Furthermore,the simulation results show that the segregation degree of fiber in the vertical direction of beam decreases with the increase of fiber volume content. On the contrary,the orientation angle between fiber and beam axis increases.
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