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.
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.
作者
黄远
张帆
易伟建
HUANG Yuan;ZHANG Fan;YI Weijian(Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第9期69-75,共7页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51890901)。
关键词
套筒灌浆
黏结强度
破坏形态
分析模型
试验研究
sleeve grouting
bond strength
failure mode
analytical model
experimental research
