摘    要：以钢纤维在受力方向均匀分布的纤维混凝土板为模型，对不同载荷、不同纤维长径比的几个算例进行了ANSYS有限元分析。各个情况下纤维和基体应力和应变情况的对比研究表明，裂纹的开裂扩展由基体的材料性能决定，纤维混凝土与基体材料具有相同的弹性阶段，纤维的作用在基体开裂后才能得到充分发挥。此外，纤维在混凝土硬化过程中的主要效应为降低塑性裂纹和内部微裂纹的数量和尺度，提高混凝土材料介质的连续性，并最终改善混凝土的综合性能。

Abstract：The ANSYS finite element analysis of several examples with the different loads, different fiber aspect ratio is carried out, through the evenly distributed fiber reinforced concrete slabs with steel fiber in the direction of the force as the model. Compared with the stress and strain of fiber and concrete in each case, the results show that  crack extension of the crack is determined by the material properties of the matrix, fiber reinforced concrete and the base material have the same elastic stage, the role of the fiber can give a full play after cracking of the base body. In addition, the main effect of the fiber in the concrete hardening process is to reduce the number and scale of plastic cracks and micro-cracks, improve the continuity of the concrete material medium, and ultimately improve the overall performance of the concrete.