Bond-splitting strength of reinforced concrete member

提出了一种基于塑性理论和断裂力学的钢筋混凝土构件劈裂粘结分析方法。将钢筋截面建模为矩形。我们认为外功的增量和内功的增量是平衡的。我们用塑性理论来估算肋骨前面的内功增量。劈裂内功的增加包括混凝土内功的增加和侧向配筋的内功增加。我们用断裂力学来计算混凝土的内功增加量。将分析结果与实验结果进行了比较，得出了以下结论。对于粘结应力与滑移的关系，分析结果与试验结果吻合较好。侧向配筋率越大，钢筋轴线与肋前破坏面的夹角越小。分析结果高估了侧向配筋的应力大小，有待进一步研究解决。

We propose a method of splitting bond analyzes of reinforced concrete member based on plastic theory and fracture mechanics. Section of reinforcing bar is modeled into rectangular shape. We consider equilibrium between the increment of external work and that of internal work. We evaluate the increment of internal work in front of ribs using plastic theory. And the increment of internal work in splitting consists of the increase of internal work by concrete and that by lateral reinforcement. We use fracture mechanics for the purpose of calculating the increase of internal work by concrete. Analytical results are compared with experiments.The conclusions are as follow. Concerning the relation between bond stress and slip, the analyzes agreed with the experiments. The bigger the lateral reinforcement ratio, the smaller the angle between bar axis and failure surface in front of ribs. The analyzes overestimated the stress of lateral reinforcement, which should resolved by future research.