钢纤维-混凝土基体界面粘结性能数值分析

Numerical Analysis of the Bonding Performance of Steel Fiber-Concrete Interface

钢纤维混凝土破坏时纤维一般为拔出破坏,纤维未得到充分利用。为充分发挥钢纤维对混凝土的增强、增韧、阻裂作用,利用PFC^(3D)建立了不规则粗骨料混凝土离散元模型,通过控制变量法分析不同参数对钢纤维与混凝土基体间粘结力的影响。研究结果表明:粘结层厚度、摩擦系数和钢纤维埋深的增加,均使得钢纤维与混凝土基体间的粘结力增强;平行粘结变形模量的增加,会导致粘结力的降低。为钢纤维混凝土离散元数值模型的建立及参数的选择提供了依据,为工程应用提供了参考。

Steel fiber is usually pulled out and not fully used when steel fiber concrete is damaged.In order to make the most of the reinforcement of steel fiber,the discrete element model of irregular coarse aggregate concrete was established by PFC^3D,and the influence of different parameters on the bonding force was analyzed by the method of controlling a single variable to research the bonding performance of steel fiber-concrete matrix interface.The results show that as the thickness of bond layer,friction coefficient and embedding depth of steel fiber increases,the bonding force between steel fiber and concrete matric increases.The increase of the additional deformability provided by the parallel bond will lead to the decrease of bonding force.This paper is helpful for developing discrete element numerical model of steel fiber concrete and the selecting parameters selection.At the same time,a reference for engineering application was provided as well.