高强钢筋套筒灌浆连接的力学性能研究

Study on Mechanical Properties of Grouting Connection of High-Strength Steel Sleeve

通过预制不同缺陷类型的灌浆套筒,进行单向拉伸试验,研究套筒的破坏形式及力学性能。试验结果表明,端部缺陷长度≤2d(d为钢筋直径)时,灌浆套筒的破坏形式及力学性能与灌浆饱满试样相似;当端部缺陷≥3d时,套筒力学性能降低,出现灌浆端的钢筋拔出破坏;中部缺陷与端部缺陷有相似的破坏形式,但缺陷当量等效的情况下,套筒连接强度对中部缺陷更为敏感;水平缺陷下,套筒的连接强度随着缺陷径向厚度的增加显著降低,而偏心缺陷对套筒连接强度影响较小。

The one-way tensile test was carried out by prefabricating grouting sleeves with different defect types to study the failure mode and mechanical properties of the sleeve.The test results show that when the length of the end defect is≤2d(d is the diameter of the steel bar),the failure mode and mechanical properties of the grouting sleeve are similar to those of the full grouting sample.When the end defect is≥3d,the mechanical properties of the sleeve decreases,and the steel bar at the grouting end is pulled out and damaged.The middle defect has a similar failure form to the end defect,but when the defect equivalent is equivalent,the sleeve connection strength is more sensitive to the middle defect.Under horizontal defects,the connection strength of the sleeve decreases significantly with the increase of the radial thickness of the defect,while the eccentric defect has little influence on the connection strength of the sleeve.