（长沙理工大学土木与建筑学院， 长沙 410004）

［摘要］为研究锈蚀对钢绞线与混凝土粘结性能的影响，设计制作了12根钢绞线混凝土粘结试件。通过对试件进行室内加速锈蚀及拉拔试验，得到各试件混凝土表面锈胀裂缝分布、混凝土表面应变分布及粘结应力-滑移曲线。分析了锈胀裂缝宽度对粘结应力分布、粘结强度及粘结应力-滑移关系的影响。通过拉拔试件的粘结应力与先张法试件传递长度范围内的粘结应力的关系，建立了以平均锈胀裂缝宽度为变量的钢绞线传递长度计算公式。结果表明：钢绞线粘结应力沿整个试件呈不均匀分布，粘结应力峰值随锈胀裂缝宽度的增大呈下降趋势；试件自由端产生初始滑移及最大粘结应力下的粘结强度分别随锈胀裂缝宽度的增大而下降；锈胀裂缝对粘结应力-滑移曲线的初始线性段影响显著，不同锈胀裂缝宽度试件的粘结应力-滑移曲线差异明显；传递长度计算公式可为钢绞线试件锈胀开裂下的传递长度计算提供参考。

［关键词］钢绞线；  混凝土； 锈胀裂缝； 粘结应力； 传递长度

中图分类号：TU375， U441-4文献标识码：A文章编号：1002-848X(2017)04-0026-09

Study on bond performance between steel strand and concrete under corrosion-induced impact

Zhang Jianren, Yi Ju, Zhang Xuhui, Wang Lei

(School of Civil Engineering & Architecture, Changsha University of Science & Technology, Changsha 410004, China)

Abstract:To study the effect of corrosion on bond performance between steel strand and concrete, 12 steel strand concrete bonding specimens were made. On the basis of indoor accelerated corrosion test and pull-out test on specimens, results were obtained including the distribution of corrosion\|induced cracks on the concrete surface, the distribution of concrete surface strain and the bond stress-slip curves. The effects of corrosion-induced cracks on the bond stress distribution, bond strength and bond stress-slip curves were studied. The calculation formula of steel strand transfer length was established with average corrosion-induced crack width as variable, based on the relationship between bond stress and transfer length of pull-out specimens. The results show that the distribution of bond stress along the embedment length range is non-uniform, and the bond stress peak value gradually drops with the growth of corrosion-induced crack width. The initial slip generated of free end of specimen and bond strength under maximum bond strength obviously decline with the increase of corrosion-induced crack width. The corrosion-induced crack has an obviously effect on the initial linear section of bond stress-slip curves. Bond stress-slip curves of specimens with different corrosion-induced crack width have obvious difference. The transfer length calculation formula can provide appropriate reference for the calculation of transfer length of steel strand specimen with corrosion-induced crack.

Keywords:steel strand; concrete; corrosioninduced crack; bond stress; transfer length

*国家重点基础研究发展计划(973计划)(2015CB057705)，湖南省自然科学杰出青年基金项目(14JJ1022)。

作者简介：张建仁，博士，教授，博士生导师，Email: jianrenz@hotmail.com。