论文部分内容阅读
提出了一种适用于高温后带肋钢筋与混凝土黏结滑移关系的预测模型。根据拔出试验的破坏特征,将黏结滑移关系曲线的上升段按混凝土开裂与否分为两个阶段,分别建立力学模型以揭示锥楔作用的黏结机制。结合国家标准建议的钢筋外形,归纳了钢筋肋间距与直径之间的关系,提出了以肋间距为主要变化参数的高温后特征滑移,研究发现高温后黏结滑移关系曲线的下降段符合负指数函数衰减规律。除了高温作用对材性的影响之外,高温后界面滑移路径的改变也是影响黏结滑移关系的重要因素。与试验结果的对比表明,所提出的方法可对高温后配箍、短埋黏结试件的黏结滑移关系进行较准确的预测。
A prediction model suitable for the bond-slip between ribbed bar and concrete is proposed. According to the failure characteristics of the pull-out test, the rising section of the bond-slip relationship curve is divided into two stages according to whether the concrete is cracked or not. Mechanical models are established respectively to reveal the bonding mechanism of the cone-wedge action. According to the shape of rebar recommended by national standards, the relationship between the rib spacing and the diameter of the rib is summarized. The post-high-temperature characteristic slip with the rib spacing as the main parameter is proposed. It is found that the descending section of the bond- Exponential decay law. In addition to the effect of high temperature on the material properties, the change of the interface slip path after high temperature is also an important factor that affects the relationship between the bond slip and the slip. The comparison between the experimental results and the experimental results shows that the proposed method can accurately predict the bond-slip relationship between high-temperature bail and short-length bonded specimens.