钢筋与再生混凝土黏结破坏过程的能量机制研究

Energy mechanism of the bonding failure process between the rebars and the recycled concrete

提出外力作用下钢筋与再生混凝土间的滑移可以看作是界面材料在外力作用下产生的变形,指出用能量的方法研究黏结破坏问题的合理性;分析了黏结破坏过程中的能量种类、相互转化过程以及对黏结破坏所起的不同作用;揭示了黏结破坏过程中的能量耗散和能量释放特性,并从能量的角度划分了黏结破坏过程的3个阶段;结合钢筋与再生混凝土的黏结滑移本构模型,对能量变化的微观机制进行了探讨;最后,推导出含有界面内能变化量的平均黏结应力计算表达式,从能量角度对黏结应力的变化情况进行了分析。

Propose an idea the slip between the rebar and the recycled concrete can be seen as the deformation of interface material under exter-nal force,point out the rationality of the method that using the energy policy to study the problem of bond failure;analyze the type of the energy during the process of bond failure,bond mutual conversion process and the different roles played by destruction;reveal the characteristics of ener-gy dissipation and energy release,and divide the three stages of the bond failure process from the perspective of the energy;with the bond-slip con-stitutive model,discuss the microscopic mechanism of energy changing.Finally,deduce to the formula of the average bond stress,and analyze the bond stress from the energy point of view.