灌浆缺陷对半灌浆套筒接头力学性能影响的试验研究

Experimental study on the effect on the mechanical performance of semi-grouted sleeve connections with grouting defects

为研究不同程度竖向顶部脱空灌浆缺陷对半灌浆套筒接头力学性能的影响,设计和制作了灌浆饱满度分别为60%~100%的五种钢筋试件,并对其进行了单向拉伸、高应力反复拉压和大变形反复拉压试验,分析了不同加载工况下半灌浆套筒接头的破坏模式、抗拉强度、残余变形和灌浆料破坏深度。结果表明:在单向拉伸荷载作用下,灌浆饱满度超过60%后,各试件均未发生钢筋拔出破坏,抗拉强度和残余变形基本一致;在高应力反复拉压和大变形反复拉压荷载作用下,60%灌浆饱满度的试件出现钢筋拔出破坏;随着灌浆饱满度提高,试件残余变形逐渐减小。

To study the mechanical performance of semi-grouted sleeve connections with different vertical grouting defects at top,five kinds of semi-grouted sleeve connection specimens with grout fullness of 60%~100%were designed and produced to conduct monotonic tensile,high stress repeated tension-compression and large deformation repeated tension-compression tests.The damage mode,tensile strength,residual deformation,and grout damage depth were analyzed under different loading conditions.The results show that after the grouting fullness exceeded 60%under monotonic tensile loading,no rebar pullout damage occurrs in each specimen,and the tensile strength and residual deformation are basically the same.Under the high stress repeated tension-compression and large deformation repeated tension-compression loading,rebar pullout damage appears in the specimen of 60%grouting fullness.With the increase of the grouting fullness,the residual deformation of semi-grouted sleeve connection is gradually reduced.