钢纤维混凝土浇筑过程中纤维运动的数值模拟
Numerical Simulation of Fiber Motion in the Process of Steel Fiber Reinforced Concrete Casting

纤维混凝土构件内纤维的分布形态对其受力性能有着直接的影响, 因此, 研究自密实混凝土浇筑过程中纤维的运动以及得到其在构件内部最终的分布形态具有十分重要的意义．本文利用ANSYS CFX软件中的流体计算模块及拉格朗日粒子追踪功能, 通过MATLAB自编程序调用和完善ANSYS CFX强大的流体计算能力, 得到一种模拟自密实钢纤维混凝土浇筑过程中纤维运动的新方法．将单根钢纤维简化为两个距离固定(为纤维长度)的球形粒子, ANSYS CFX模拟粒子在整个浇筑过程中的运动, MATLAB自编程序控制粒子之间的固定配对并保证每对粒子在计算过程中保持相对距离不变．通过数值模拟浇筑一根1 200 mm×150 mm×150 mm的梁来验证计算的精确性．将模拟结果与实验结果进行对比, 证明了模拟方法的适用有效性．这种新方法可用于各种掺量刚性纤维自密实混凝土的浇筑流动模拟．
It is of great significance to study the motion of fibers during the flow of concrete mixture and the final distribution and orientation of fibers in members，because the distribution and orientation of fibers could directly determine the mechanical properties and behaviors. A new method has been put forward to simulate the motion of steel fibers in self-compacting concrete mixture during the flow by the program written by MATLAB，which can call the fluid calculation module as well as Lagrangian particle tracking function in ANSYS CFX. The ends of a fiber are represented by two particles with fixed distance(the fiber length). ANSYS CFX simulates the motion of fibers during the flow，while MATLAB program control each particle belongs to a fixed fiber and guarantees that the length of each fiber remains unchanged. To verify the accuracy of the model，a beam of 1 200 mm×150 mm×150 mm was cast through numerical simulations. The simulation method is proved to be effective and feasible through the comparison between the simulation results and the experimental results. The new method can be used to simulate the flow of self-compacting concrete with different volume fraction of rigid fibers