屈服后钢筋黏结锚固性能试验研究

为研究屈服后钢筋黏结锚固性能，采用钢筋表面开槽埋置电阻应变片的方法测量钢筋的应变分布，以钢筋强度等级、混凝土强度、钢筋直径、保护层厚度、配箍率、锚固长度等为变量，完成了15个梁端式黏结锚固试验. 试验结果表明：钢筋屈服后，加载端相对滑移显著增加，钢筋屈服段黏结应力明显减小，最大屈服渗透深度与钢筋所受约束和钢筋直径等因素...

Experimental Study on Bond Anchorage Properties of Steel Bar After Yielding

In order to study the bond anchorage properties of steel bars after yielding, the strain distribution of steel bars was measured by the method of slotted steel bar surface and embedded resistance strain gauge. A total of 15 beam end bond anchorage tests were carried out by taking the strength grade of steel bars, the strength of concrete, the diameter of steel bars, the thickness of the protective layer, the ratio of the hoop, and the anchorage length as vari? ables. The test results show that the relative slip of the loading end increases significantly after steel bar yield, the bond stress of the yielding section decreases significantly, and the maximum yield penetration depth is related to the constraint of the steel bar and the diameter of the steel bar. Based on the test results, the formula for calculating the relative slip of the loading end after yielding is obtained by statistical regression. At the same time, a calculation method of the anchorage length after steel bar yielding is proposed, which can effectively calculate the anchorage length after steel bar yielding.