高温后带肋钢筋与混凝土黏结滑移关系预测模型

发布时间：2018-10-24 09:26

【摘要】：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。
[Abstract]:A prediction model of bond slip relationship between ribbed steel bar and concrete after high temperature is proposed. According to the failure characteristics of pull-out test, the ascending section of the bond slip relation curve is divided into two stages according to whether the concrete is cracked or not, and the mechanical models are established to reveal the bonding mechanism of the tapered wedge. Combined with the shape of steel bars recommended by the national standard, the relationship between rib spacing and diameter is summarized, and the characteristic slip after high temperature with rib spacing as the main variable parameter is put forward. It is found that the descending section of the bond slip relation curve after high temperature is in accordance with the law of negative exponential function attenuation. In addition to the effect of high temperature on the properties of wood, the change of interface slip path after high temperature is also an important factor affecting the bond slip relationship. The comparison with the experimental results shows that the proposed method can accurately predict the bond slip relationship of the specimens with high temperature post-hoop and short burying bonding.
【作者单位】：中国矿业大学力学与建筑工程学院;中国电力科学研究院;
【基金】：国家自然科学基金项目(51474218) 教育部中央高校基本科研业务费专项(2011QL05)
【分类号】：TU375

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