钢筋与砼之间的粘结锚固,随拉、压荷载的重复作用或反复作用而逐渐退化。本文通过重复拉拔加载、压入加载和拉、压反复加载试验,研究了粘结退化的机理和影响粘结退化的主要因素,并提出了计算粘结强度退化率的公式。最后,根据试验研究的结果,建议了抗震设计时应考虑的附加锚固长度的数值。 Bonding and anchorage between steel bars and concretes gradually degrades with the repeated or repeated action of tensile and compressive loads. In this paper, the mechanism of bond degradation and the main factors influencing the degradation of bond are studied by repeated drawing and loading, and repeated loading tests under tension and compression. The formula for calculating the degradation rate of bond strength is proposed. Finally, based on the results of the pilot study, the value of the additional anchorage length that should be taken into account in the seismic design is proposed.