The mechanical behaviours of the rebar in steel half-grouted sleeve connections with constructional deficiencies in the water/binder grout ratio were experimentally investigated in this study. The experimental variables were the rebar diameter, which varied from a small value of 12 mm to a large value of 20 mm, and the water/binder ratio of the grout, which ranged from 0.12 to 0.24. Six groups of steel half-grouted sleeve specimens were manufactured and tested under a tensile load to ascertain the failure mode, ultimate bearing capacity, strain distribution, and damage depth. The results indicated that the load–displacement responses of all the specimens were similar. Specifically, the specimens exhibited a linear elastic range, yield range, strain-hardening range, and necking range. The displacements at the yield and failure points, the tensile strain of the sleeve surface, and the depth of the damage at the grouting end all increased with the rebar diameter. High water/binder ratios led to bond failure and increased the damage depth at the grouting end. The hoop strain near the vent hole gradually changed from a compressive strain to tensile strain. An analytical model was established and verified to predict the ultimate bearing capacity of the specimens, considering the effect of the water/binder ratio; the bearing capacities of the specimens with high water/binder ratios were in agreement with the experimental data.

在这项研究中，通过实验研究了钢在半灌浆套筒连接中钢筋的力学行为，该结构在水/粘合剂灌浆比方面存在结构缺陷。实验变量是钢筋直径（从小值12毫米变化到大值20毫米）以及灌浆的水/粘结剂比，范围从0.12到0.24。制造了六组钢半灌浆套筒试样，并在拉伸载荷下进行了测试，以确定破坏模式，极限承载力，应变分布和破坏深度。结果表明，所有样品的荷载-位移响应都相似。具体而言，样品表现出线性弹性范围，屈服范围，应变硬化范围和颈缩范围。屈服点和破坏点的位移，套筒表面的拉伸应变以及灌浆端的破坏深度都随钢筋直径的增加而增加。高的水/粘合剂比率导致粘结失败并增加了灌浆端的破坏深度。排气孔附近的环向应变从压缩应变逐渐变为拉伸应变。考虑水/粘合剂比的影响，建立了分析模型并进行了验证，以预测样品的最终承载力；高水灰比的试样的承载力与实验数据一致。排气孔附近的环向应变从压缩应变逐渐变为拉伸应变。考虑水/粘合剂比的影响，建立了分析模型并进行了验证，以预测样品的最终承载力；高水灰比的试样的承载力与实验数据一致。排气孔附近的环向应变从压缩应变逐渐变为拉伸应变。考虑水/粘合剂比的影响，建立了分析模型并进行了验证，以预测样品的最终承载力；高水灰比的试样的承载力与实验数据一致。