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反复拉伸荷载对装配式建筑钢筋灌浆套筒连接性能的影响
作者：洪明1，蔡军1，凌宏杰2，刘金涛2
（1.浙江华东工程咨询有限公司，浙江 杭州 311122；2.浙江工业大学 土木工程学院，浙江 杭州 310023）
摘要：对带缺陷的装配式建筑钢筋灌浆套筒在反复拉伸荷载作用下的性能进行研究，以缺陷位置、缺陷大小、缺陷分布形式和钢筋偏心为变量，分析了缺陷对灌浆套筒拉伸荷载下的破坏形态、滑移量、承载力的影响。结果表明：不同类型的缺陷灌浆套筒在高应力反复拉伸下均发生钢筋拉断的破坏模式，套筒灌浆滑移量随着高应力反复拉伸循环次数增加而显著增大；相同高应力反复拉伸循环次数下，不同缺陷对试件滑移量、残余变形和残余应变影响程度分别为：偏心锚固缺陷＞均布缺陷＞中部缺陷＞水平缺陷＞端部缺陷。
关键词：装配式建筑；钢筋套筒；连接性能；灌浆缺陷；反复拉伸
中图分类号：TU58 文献标识码：A 文章编号：1001-702X（2022）08-0073-07
Influence of repeated tension on the joint performance of reinforced grouting sleeve in prefabricated buildings
HONG Ming1，CAI Jun1，LING Hongjie2，LIU Jintao2
（1.Zhejiang Huadong Engineering Consulting Co. Ltd.，Hangzhou 311122，China；
2.College of Civil Engineering，Zhejiang University of Technology，Hangzhou 310023，China）
Abstract：The performance of the prefabricated reinforced grouting sleeve with defects under repeated tensile load is studied. The influence of defects on the failure mode，slip amount and bearing capacity of the grouting sleeve under tensile load is analyzed by taking the location，size，distribution form of defects and eccentricity of reinforcement as variables. The test results show that the failure mode of reinforcement fracture occurs in the five kinds of defective grouting sleeves under high stress and repeated tensile load. The slip amount of sleeve grouting increases significantly with the increase of the number of high stress tensile cycles. Under the same number of high stress repeated tensile cycles，the influence degree of different defects on the slip amount，residual deformation and residual strain of the specimen is in the order of eccentric anchorage defects>uniform defects>middle defects>horizontal defects>end defects.
Key words：prefabricated building，steel sleeve，connection performance，grouting defect， repeated stretching