（1 华北理工大学建筑工程学院， 唐山 063210；2 河北省地震工程研究中心省重点实验室， 唐山 063210）

［摘要］为研究二次补浆量对半灌浆钢制套筒灌浆连接性能的影响，以钢筋直径和二次补浆量为试验参数，设计制作了18个试件。通过单向拉伸试验主要研究了试件的破坏形式、极限承载力、应变分布、灌浆料损伤深度等。结果表明：试件破坏形式受钢筋直径和二次补浆量的影响较小，套筒两端钢筋发生颈缩破坏，接头强度满足要求，端部灌浆料呈锥形破坏。直径12mm和20mm钢筋连接试件极限强度分别大于和接近钢筋实测极限强度，其中直径12mm的钢筋连接试件与钢筋实测极限强度最大偏差约4.47%。随着二次补浆量增大，直径12mm钢筋连接试件纵向应变不再趋于均匀分布，各测点应变数值差异逐渐增大，直径20mm钢筋连接试件环向峰值应变位置改变。随着钢筋直径和二次补浆量的增大，灌浆料损伤深度数值及其占钢筋嵌入长度的百分比整体呈增大趋势，两种试件最大损伤深度所占百分比分别为8.54%和9.89%。

［关键词］二次补浆量； 钢筋直径； 半灌浆钢制套筒； 连接性能； 装配式结构

中图分类号：TU758-14文献标识码：A文章编号：1002-848X(2020)22-0045-06

Experimental study on effect of secondary grouting on connection performance of rebar sleeve grouting

WANG Zhanwen1, CHEN Jianwei1,2, JU Shilong1, LIU Ziye1

(1 College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan 063210, China;  2 Key laboratory of Earthquake Engineering Research Center of Hebei Province, Tangshan 063210, China)

Abstract:In order to study the effect of the amount of secondary grouting on the connection performance of semi-grouted steel sleeve grouting, 18 specimens were designed and fabricated with the rebar diameter and the amount of secondary grouting as test parameters. Through uniaxial tensile test, the failure form, ultimate bearing capacity, strain distribution and damage depth of grouting material were mainly studied. The results show that the failure mode of the specimen is less affected by   rebar diameter and the amount of secondary grouting. The rebars at both ends of the sleeve are damaged by necking, the splice strength meets the requirements, and the end grouting material is conical failure. The ultimate strength of the 12mm and 20mm rebar connection specimens is greater than and close to the measured ultimate strength of the rebar, respectively. The maximum deviation between the 12mm diameter rebar connection specimens and the measured ultimate strength of the rebar is about 4.47%. With the increase of the amount of secondary grouting, the longitudinal strain of the 12mm diameter rebar connection specimen no longer tends to be uniformly distributed, the difference of the strain values at each measuring point gradually increases, and the circumferential peak strain position of the 20mm diameter rebar connection specimen changes. As  rebar  diameter and the amount of secondary grouting increase, the damage depth of the grouting material and its percentage in the embedded length of the rebar increase as a whole. The percentages of the maximum damage depth of the two specimens are 8.54% and 9.89% respectively.

Keywords:amount of secondary grouting; rebar diameter; semi-grouted steel sleeve; connection performance; prefabricated structure

*国家自然科学基金项目（51678236）。

作者简介：王占文，硕士研究生，Email：wzw5756@163.com； 

通信作者：陈建伟,博士,教授,博士生导师, Email：jwchen@ncst.edu.cn。