光圆钢筋与活性粉末混凝土的粘结性能研究

The Research of Bond Capability between Round Steel Bars and Reactive Powder Concrete

为了研究光圆钢筋与活性粉末混凝土的粘结性能,本文改变钢筋直径与锚固长度测定了粘结应力和滑移量。通过理论分析与数据拟合,研究了粘结应力的影响因素、计算公式及粘结-滑移本构关系。结果表明:粘结应力受钢筋埋长、钢筋直径等因素的影响,随着埋长与钢筋直径的增大而减小。提出的以相对保护层厚度(c/d)和相对埋长(l/d)为主要参数的极限粘结应力计算公式,与试验结果吻合良好。分析给出不同直径光圆钢筋的锚固长度,并按GB 50010-2002的模式提出相应的锚固长度计算公式。本文提出的粘结-滑移本构方程与实测结果相关性好,可为活性粉末混凝土结构理论分析提供依据。

To study the bond capability between round steel bars and reactive powder concrete, the bond stress and slippage are measured with steel bars of different diameters and anchorage lengths. On the basis of theoretical analysis of experimental data, the author presents factors that affect the bond stress and the bond-slip constitutive relationship. The research indicates the bond stress decreases with the increase of the diameter and the embedded length of a steel bar. The formulations of the limit bond stress carry the main parameters of the thickness of the protective coat（c/d） and the relative embedded length （l/d） and agree well with the experiments. According to GB 50010-2002, the paper gives a new formulation to calculate the anchorage length, which can provide foundation for theoretical analysis of reactive powder concrete structures.