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钢纤维与水泥基材料界面过渡区的粘结强度是一项重要的力学性能参数,一般通过纤维拔出试验测得。为了研究钢纤维水泥基材料的粘结性能,利用内聚力模型模拟了钢纤维增强水泥基材料的界面荷载传递。内聚单元本构关系采用双线性张开应力-位移模型。采用试验与有限元相结合的方法确定内聚力模型的相关参数,并通过其他试验数据对选取参数进行验证。对内聚力参数进行分析,得到内聚力模型参数对纤维拔出特性的影响规律,结果表明内聚力模型的临界断裂能与界面承载力正相关而与界面刚度负相关,最大应力值与界面刚度正相关。给出了合理选取内聚力参数的方法以及纤维水泥基材料界面的内聚力参数值。
The bond strength of the interface between the steel fiber and the cement-based material is an important mechanical property parameter and is generally measured by the fiber pull-out test. In order to study the bond behavior of steel fiber cement-based materials, the cohesion model was used to simulate the interface load transfer of steel fiber reinforced cement-based materials. The cohesive element constitutive relation adopts bilinear open stress-displacement model. The experimental and finite element methods are used to determine the relevant parameters of the cohesion model and validate the selected parameters through other experimental data. The cohesion parameters were analyzed and the influence of cohesion model parameters on fiber pullout characteristics was obtained. The results show that the critical fracture energy of cohesion model is positively correlated with the interfacial bearing capacity and negatively correlated with interfacial stiffness, and the maximum stress value is positively correlated with interfacial stiffness. The reasonable selection of cohesion parameters and the cohesion parameters of fiber cement-based materials were given.