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钢纤维混凝土的力学性质和本构关系是其应用的基础,因此研究其本构模型具有十分重要的意义。通过ODF得出纤维正交各向异性弹性本构,并结合混凝土的损伤塑性本构模型,利用ABAQUS提出一种新的钢纤维混凝土的非线性本构模型。根据纤维的分布状态对550mm×150mm×150mm的纤维混凝土梁进行合理划分,并分别求解体积单元中相应的纤维本构关系,结合混凝土本构模型提出钢纤维混凝土的本构模型。最后通过对比四点弯曲试验和相应数值模拟的结果来验证提出的本构模型的正确性和有效性,以及研究钢纤维的加入对混凝土力学性能的影响。
The mechanical properties and constitutive relationship of steel fiber reinforced concrete are the basis of its application, so it is of great significance to study its constitutive model. The fiber orthotropic elastic constitutive model was derived by ODF. A new nonlinear constitutive model of steel fiber reinforced concrete was proposed by ABAQUS based on the damage plastic constitutive model of concrete. According to the distribution of fiber, the fiber reinforced concrete beams of 550mm × 150mm × 150mm are reasonably divided, and the corresponding fiber constitutive relations in volume elements are solved respectively. The constitutive model of steel fiber reinforced concrete is proposed based on the constitutive model of concrete. Finally, by comparing the results of four-point bending test and corresponding numerical simulation, the correctness and validity of the proposed constitutive model are verified, and the influence of the addition of steel fiber on the mechanical properties of concrete is also studied.