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本文利用非线性有限元方法来处理钢筋混凝土的粘结问题,在建立材料模型时采用了单轴应力—应变全曲线,以及二维(三维)应力状态的破坏包络线(面),对钢筋和混凝土之间的滑移进行了模拟计算,得出了粘结剪应力、正应力与滑移量之间的关系曲线,以及钢筋附近的塑性变形区和裂纹分布呈圆锥形的分布图。计算结果与相应的拔出实验结果基本一致,另外还发现钢筋混凝土同样存在不连续强度。
In this paper, the nonlinear finite element method is used to deal with the bond problem of reinforced concrete. The uniaxial stress-strain curve and the failure envelope (surface) of two-dimensional (three-dimensional) And the slip between the concrete were calculated. The relationship curves between the bond shear stress, the normal stress and the slippage were obtained, and the distribution of the plastic deformation zone and the crack distribution in the vicinity of the rebar were conical. The calculated results are basically consistent with the corresponding pull-out test results. In addition, the discontinuous strength of reinforced concrete is also found.