缺陷可检修型半灌浆套筒连接拉伸性能试验研究

EXPERIMENTAL STUDY ON TENSILE PERFORMANCE OF DEFECT DETECTABLE AND REPAIRABLE HALF GROUTED SLEEVE CONNECTION

为解决灌浆套筒的施工质量检测和修补的难题,提出了一种缺陷可检修型半灌浆套筒(defect detectable and repairable half grouted sleeve,DDRHGS)。为了验证DDRHGS连接接头的拉伸性能和修补功能的可靠性,综合考虑有无灌浆缺陷、灌浆缺陷率、是否修补、修补材料种类、钢筋直径等因素影响,设计制作了26组78个连接接头试件,开展了单向拉伸加载试验。结果表明:无灌浆缺陷连接接头试件的拉伸性能可满足相关规范要求;灌浆缺陷率对连接接头试件的拉伸性能影响最为显著,较高的缺陷率会导致钢筋滑移破坏,试件的承载能力和变形能力无法满足相关规范要求;新型套筒灌浆缺陷修补功能整体可靠,48个试件的破坏模式、承载能力和变形能力与无缺陷试件基本相当,同等级灌浆料和植筋胶作为修补材料均可保证其修补质量。

To solve the problem of detecting and repairing defects of constructed grouted sleeve,a defect detectable and repairable half grouted sleeve(referred to as DDRHGS hereafter)is proposed.To investigate the tensile performance of the connection using DDRHGS and validate the reliability of its repair function,26 groups with 78 specimens were tested under uniaxial tensile load.Numerous factors were comprehensively considered,including with or without grouting defects,grouting defect ratio,with or without repair,material used to repair,and diameter of the rebar.Test results indicate that the specimens without defects exhibit a good tensile performance and meet the requirements specified in relevant codes.Grouting defect ratio has significant influence on the corresponding tensile performance.A higher defect ratio will lead to the bond-slip failure mode,and the tensile capacity as well as deformation capacity of such specimens can not meet the requirements in codes.The defect repairing function of DDRHGS is overall proved to be reliable.The 48 repaired specimens all exhibited the desirable failure mode,and correspondingly,the tensile capacity and deformation capacity were basically identical with those of specimens without defects.Grout and epoxy mortar can both be used as the repairing material to ensure the repair quality.