黄远1,2,张帆2,易伟建1,2.套筒约束灌浆料与钢筋黏结强度试验研究[J].湖南大学学报:自然科学版,2020,(9):69~75
套筒约束灌浆料与钢筋黏结强度试验研究
Experimental Study on Bond Strength between Sleeve Confined Grouting and Steel Bars
  
DOI:
中文关键词:  套筒灌浆  黏结强度  破坏形态  分析模型  试验研究
英文关键词:sleeve grouting  bond strength  failure mode  analytical model  experimental research
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作者单位
黄远1,2,张帆2,易伟建1,2 (1. 湖南大学 工程结构损伤诊断湖南省重点实验室湖南 长沙410082 2. 湖南大学 土木工程学院湖南 长沙410082) 
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中文摘要:
      为了对装配式混凝土结构中套筒灌浆连接接头钢筋与灌浆料的黏结性能进行研究,设计了30个灌浆套筒连接节点进行拉拔试验,研究了钢筋锚固长度、灌浆料抗压强度、灌浆料厚度和钢筋直径四个参数对黏结强度的影响.试验结果表明:随着锚固长度增加,钢筋与灌浆料之间的黏结强度降低;随着灌浆料抗压强度增加,钢筋与灌浆料之间的黏结强度增加;随着灌浆料厚度的增加,黏结强度降低,对于12 mm的钢筋,当灌浆料厚度在9 ~ 11 mm之间时,灌浆料厚度对黏结强度影响较小,当灌浆料厚度超过11 mm时,影响显著增加;黏结强度随着钢筋直径的增加而增大.根据试验量测的套筒应变和隔离体受力平衡模型,得到了黏结强度与约束应力、灌浆料抗压强度的关系式,可供工程实际中套筒灌浆连接节点锚固长度取值参考.
英文摘要:
      In order to study the bond behavior between the steel bar and the grouting material of the sleeve grouting joint in the precast concrete structure, 30 specimens of grouting sleeve are designed for pull-out tests. The effects of four parameters including steel anchorage length, grouting compressive strength, grouting thickness and steel bar diameter on the bond strength of steel bars were studied. The results show that as the anchor length increases, the bond strength between the steel bar and the grout decreases; with the increase of compressive strength of grouting material, the bond strength between reinforcement and grouting material increases. With the thickness of the grout increasing, the bond strength decreases. For 12 mm steel bars, when the thickness of the slurry is between 9 mm and 11 mm, the thickness of the slurry has little effect on the bond strength. When the thickness of the slurry exceeds 11 mm, the effect is significantly increased. The bond strength increases as the diameter of the bar increases. According to the measured sleeve strain and the balance distribution model of the spacer, the relationship between the bond strength and the restraint stress as well as the compressive strength of the grout is obtained, which can provide a reference for the anchorage length of grouted sleeve connections in the engineering practice.
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