新旧混凝土凹凸咬合界面剪切滑移的破坏形态与承载力分析

Analysis of Failure Mode and Bearing Capacity of New-Old Concrete Occlusal Interface Under Shear Load

为揭示新旧混凝土界面的剪切滑移受力机理并分析其受剪承载力,以规则凹凸咬合的新旧混凝土界面为研究对象,分析界面剪切滑移受力特征,推断出齿剪断、界面钢筋剪断、界面钢筋拉断、齿滑脱四种破坏形态;根据每种破坏形态的受力特征分别建立其受剪承载力方程,推导每种破坏形态发生的条件;将本文公式计算结果与已有试验结果进行对比,发现两者吻合较好。

In order to reveal the shear slip mechanism of the new and old concrete interface and analyze its shear bearing capacity,the shear performance of the simple regular occlusal interface of the new and old concrete was tested.Based on the analysis of the characteristics of shear stress on the interface,it is inferred that four failure modes of teeth-cut,reinforcement-shear cut,reinforcement-pull cut and teeth-slide out could happen.The bearing capacity equations were established according to the mechanical characteristics of each failure mode,and the conditions of the four failure modes were also deduced.Comparation between the formula calculation shows that there are good agreements with each other.