解琳琳, 钟勃健, 苗启松, 陈曦, 孙海林, 杨参天, 冯雪. 缺陷可检修型半灌浆套筒连接高应力反复拉压性能试验研究[J]. 工程力学, 2022, 39(5): 96-104. DOI: 10.6052/j.issn.1000-4750.2021.01.0054
引用本文: 解琳琳, 钟勃健, 苗启松, 陈曦, 孙海林, 杨参天, 冯雪. 缺陷可检修型半灌浆套筒连接高应力反复拉压性能试验研究[J]. 工程力学, 2022, 39(5): 96-104. DOI: 10.6052/j.issn.1000-4750.2021.01.0054
XIE Lin-lin, ZHONG Bo-jian, MIAO Qi-song, CHEN Xi, SUN Hai-lin, YANG Can-tian, FENG Xue. EXPERIMENTAL INVESTIGATION ON PERFORMANCE OF DEFECT DETECTABLE AND REPAIRABLE HALF GROUTED SLEEVE CONNECTION UNDER HIGH STRESS CYCLIC TENSION-COMPRESSION LOAD[J]. Engineering Mechanics, 2022, 39(5): 96-104. DOI: 10.6052/j.issn.1000-4750.2021.01.0054
Citation: XIE Lin-lin, ZHONG Bo-jian, MIAO Qi-song, CHEN Xi, SUN Hai-lin, YANG Can-tian, FENG Xue. EXPERIMENTAL INVESTIGATION ON PERFORMANCE OF DEFECT DETECTABLE AND REPAIRABLE HALF GROUTED SLEEVE CONNECTION UNDER HIGH STRESS CYCLIC TENSION-COMPRESSION LOAD[J]. Engineering Mechanics, 2022, 39(5): 96-104. DOI: 10.6052/j.issn.1000-4750.2021.01.0054

缺陷可检修型半灌浆套筒连接高应力反复拉压性能试验研究

EXPERIMENTAL INVESTIGATION ON PERFORMANCE OF DEFECT DETECTABLE AND REPAIRABLE HALF GROUTED SLEEVE CONNECTION UNDER HIGH STRESS CYCLIC TENSION-COMPRESSION LOAD

  • 摘要: 为解决灌浆套筒饱满度缺陷引起的连接性能不可靠问题,研究团队前期提出了一种缺陷可检修型半灌浆套筒连接。为明确高应力反复拉压荷载下该套筒的连接性能,该研究考虑2种钢筋直径、4种灌浆缺陷率和2种修补方式影响,制作了26个试件进行高应力反复拉压试验,对比分析无缺陷、不同缺陷和缺陷修补套筒连接的破坏形态、承载力和变形能力的异同。结果表明:反复拉压荷载对较高缺陷率试件影响显著,当缺陷率达到一定阈值时,试件出现钢筋滑移破坏,承载力和变形能力显著低于无缺陷构件,该阈值随着钢筋直径的增大而减小;对于直径为20 mm、缺陷率为60%的试件,在钢筋尚未屈服前即发生粘结滑移破坏;无缺陷和缺陷修补试件破坏模式则均为钢筋拉断,且承载力和变形能力基本一致,采用灌浆料和植筋胶修补均可满足规范要求,验证了新型套筒修补的合理性和可靠性。

     

    Abstract: To improve the unreliable connection performance of grouted sleeves caused by the filling defect, a defect detectable and repairable half grouted sleeve connection had been proposed by the authors. In order to identify the performance of this new connection under high stress cyclic tension-compression load, 26 specimens, with the consideration of two different diameters of rebar, four grouting defect ratios and two repair methods, were manufactured and tested. The failure modes, bearing and deformation capacities of the specimens without defection, with different defect ratio and the repaired specimens were compared and analyzed. The results indicate that the connection performance of the specimens with high defect ratio is significantly affected by the cyclic tension-compression load. Once the ratio reaches a threshold, a bar slip failure mode is observed for these specimens, and the tensile capacity as well as deformation capacity are significantly lower than those of the specimens without defection. The threshold decreases with the increase of the diameter of rebar. For the specimen with a diameter of 20 mm and a defect ratio of 60%, the bar slip failure is observed before the rebar yields. In contrast, the repaired specimens and specimens without defection both exhibit a tensile failure mode, and the bearing as well as deformation capacities are approximately identical for these specimens. In addition, grout-repaired and epoxy-repaired specimens both satisfy the requirements specified in the associated code, thus validating the rationality and reliability of this new type of half grouted sleeve.

     

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