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良好的粘结性能是确保再生混凝土与钢筋能够共同工作的前提条件。通过120个试件的拉拔试验,并结合非平衡态热力学与损伤力学的相关理论分析再生混凝土与钢筋间的粘结滑移性能。提出三段式的粘结滑移本构模型,对比表明该模型对实测粘结滑移曲线具有较好的模拟效果。分析了粘结破坏过程中的能量守恒与能量耗散特性,给出了耗散能与弹性变形能代表值的计算公式,探讨了初始弹性变形能与极限弹性变形能的关系,并基于本构破坏能,对影响粘结性能的因素进行了分析。提出相对损伤变量的概念,定义了界面相对损伤变量,推导出相对损伤滑移方程,分析了界面初始损伤、界面损伤发展阶段以及界面损伤的发展速度。研究结果可为推广应用钢筋再生混凝土结构提供基础研究资料。
Good bonding properties are a prerequisite for ensuring that recycled concrete and rebar work together. The pull-out test of 120 specimens and the theory of non-equilibrium thermodynamics and damage mechanics were used to analyze the bond-slip properties between recycled concrete and steel bar. A three-stage model of bond-slip constitutive model was proposed. The comparison shows that the model has a good simulation effect on the measured bond-slip curve. The energy conservation and energy dissipation in the process of bond failure were analyzed. The formulas for calculating the representative values of dissipative energy and elastic deformation energy were given. The relationship between initial elastic deformation energy and ultimate elastic deformation energy was discussed. Destructive energy, the factors that affect the bonding performance were analyzed. The concept of relative damage variables is defined, the relative damage variables are defined, and the relative damage slip equations are deduced. The initial interface damage, the development stage of interface damage and the development speed of interface damage are analyzed. The research results can provide basic research data for popularizing and applying reinforced concrete recycled structure.