（中国建筑科学研究院有限公司， 北京 100013）

［摘要］灌浆饱满度是影响装配式结构钢筋套筒灌浆连接可靠性的重要因素，考虑灌浆饱满度、钢筋位置、钢筋强度级别等因素，制作了51个GTJB4 20/20型半灌浆套筒钢筋接头试件进行试验，研究灌浆饱满度对接头抗拉强度和变形性能的影响。结果表明，随着灌浆饱满度的降低，接头的变形性能先于抗拉强度出现降低，钢筋拔出破坏时，接头变形性能大幅降低；灌浆饱满度为62.5%时，接头试件出现了灌浆端钢筋拔出破坏，灌浆端拔出破坏的试件抗拉强度与灌浆饱满度密切相关；灌浆端钢筋拔出破坏试件在达到最大力后会有二次锚固现象；当灌浆饱满度不小于87.5%时，接头残余变形基本一致，当灌浆饱满度减小至75%时，接头残余变形迅速增大；套筒与灌浆端钢筋的相对滑移占接头残余变形的比例随灌浆饱满度的降低而增大；灌浆端钢筋拔出破坏时，接头最大力下总伸长率大幅降低；钢筋偏置对接头抗拉强度的影响不明显，但钢筋偏置试件的最大力下总伸长率总体上要小于钢筋对中试件，且偏置试件的变形性能对灌浆饱满度更敏感。研究结果为套筒灌浆连接质量的验收和处理提供依据。

［关键词］灌浆饱满度； 半灌浆套筒； 力学性能； 抗拉强度； 变形性能； 装配式混凝土结构

中图分类号：TU758-14文献标识码：A文章编号：1002-848X(2020)09-0001-06

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Experimental study on effect of grouting fullness on connection performance of grout sleeve with mechanical splicing end

SUN Bin, MAO Shiyang, OUYANG Zhipeng, WANG Ni

(China Academy of Building Research, Beijing 100013， China)

Abstract:Grouting fullness is an important factor affecting the reliability of grout sleeve splicing of rebars in the precast concrete structures.  51 specimens of GTJB4 20/20 sleeve were fabricated to test, considering factors such as grouting fullness, steel bar position and steel bar strength level. Effects of grouting fullness on tensile strength and deformation properties of splice were studied. The results show that, with the decrease of grouting fullness, the deformation property of splice decreases before the tensile strength, and the deformation property of splice decreases greatly when the steel bar is pulled out. When grouting fullness is 62.5%, pull\|out failure of steel bar at grouting end occurs in specimens, and tensile strength of pull-out failure specimens at grouting end is closely related to grouting fullness. There will be secondary anchorage after the ultimate load of pull-out failure specimens of grouting end steel bar. When grouting fullness is not less than 87.5%, the residual deformation of splice is basically the same. When grouting fullness decreases to 75%, the residual deformation of splice increases rapidly. The ratio of relative slip between sleeve and rebar at grouting end to residual deformation of splice increases with the decrease of grouting fullness. When the steel bar at grouting end is pulled out, the total elongation of the splice decreases greatly under the maximum force. The influence of steel offset on the tensile strength of splice is not obvious, however, the total elongation of eccentric specimens is generally smaller than that of centric specimens, and the deformability of eccentric specimens is more sensitive to grouting fullness. Results provide a basis for acceptance and treatment for quality of grout sleeve splicing of rebars.

Keywords:grouting fullness; grout sleeve with mechanical splicing end; mechanical property; tensile strength; deformation properties; prefabricated concrete structure

*国家重点研发计划项目（2016YFC0701800），中国建筑科学研究院应用技术研究课题（20150112330730050），住房和城乡建设部科技项目（2016-K5-043）。

作者简介：孙彬，博士，研究员，Email：sunbinmail@163.com。