（1 包头铁道职业技术学院建筑工程系， 包头 014060； 2 内蒙古科技大学土木工程学院， 包头 014010）

［摘要］以栓钉直径、埋深及是否设置钢筋网片为参数，进行了8个试件在重复荷载作用下的拉拔试验，分析了不同参数对栓钉连接件抗拔性能劣化机理的影响。研究结果表明：低应力重复荷载下，栓钉与混凝土几乎没有损伤；荷载达到栓钉屈服荷载的80%～86%时，试件变形明显增加，栓钉直径较小的试件损伤出现较早；栓钉直径和埋深较大的试件，其混凝土的冲切体积较大，损伤出现较晚；试件累积弹塑性变形随着荷载级别增加呈二次函数曲线增长,设置钢筋网片并增加栓钉埋深，可减小试件重复拉拔过程中的累积弹塑性变形；相同栓钉直径时，发生栓钉拉断破坏试件比发生混凝土破坏试件的刚度退化速度更快，设置钢筋网片并增大栓钉直径有助于减缓试件刚度退化的速度。

［关键词］栓钉连接件；重复荷载；抗拔性能；累积变形；刚度退化

中图分类号：TU398+.9文献标识码：A文章编号：1002-848X(2021)07-0052-07

Study on deterioration mechanism of anti-pulling performance of stud connector under repeated loads

TIAN Chunyu1, ZHAO Gentian2, JIA Ran2

(1 Architectural Engineering Department, Baotou Railway Vocational & Technical College, Baotou 014060， China;2 School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010， China)

Abstract:Taking the diameter, embedment depth of stud and whether or not to install steel mesh as parameters, the pull-lifting test of 8 specimens under repeated loads was carried out, and the influence of different parameters on deterioration mechanism of anti-pulling performance of stud connectors was analyzed. The research results show that the damage of the stud and concrete  almost does not appear under low stress repeated loads. When the load reaches 80%～86% of the yield load of the stud, the deformation of the specimen increases significantly, and the specimen with smaller diameter of the stud is damaged earlier. For specimens with larger diameter and embedment depth of stud, the punching volume of the concrete is larger, and the damage appears late. The cumulative elasto-plastic deformation of specimens increases with the increase of the load level in a quadratic function curve，setting steel mesh and increasing the embedment depth of stud can reduce the cumulative elasto-plastic deformation of specimens during the repeated pull-lifting process. When the diameter of the stud is same, the stiffness degradation rate of the specimen with stud breakage failure is faster than that of the specimen with concrete failure，setting up steel mesh and increasing the diameter of stud helps to slow down the rate of stiffness deterioration rate of specimens.

Keywords:stud connector;repeated load;anti-pulling performance;cumulative deformation;stiffness degradation

*国家自然科学基金项目（51268042），内蒙古自然科学基金项目（2016MS0546）。

作者简介：田春雨，硕士，讲师，一级注册结构工程师，Email:150152826@qq.com；通信作者：赵根田，博士，教授，Email:zhaogentian9311@sina.com。