赵军, 吴明训, 姚敦敏,等.高温后无缝钢管灌浆套筒单向拉伸试验研究[J].河南理工大学学报（自然科学版）,2024,43(4):186-196.

ZHAO J, WU M X, YAO D M, et al.Study on uniaxial tensile test of grouting sleeve of seamless steel pipe after high temperature[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):186-196.

高温后无缝钢管灌浆套筒单向拉伸试验研究

赵军, 吴明训, 姚敦敏, 马彬

1.桂林电子科技大学 建筑与交通工程学院，广西 桂林  541004;2.桂林理工大学 土木与建筑工程学院，广西 桂林  541004

摘要:  目的 为了解高温后无缝钢管灌浆套筒的力学性能， 方法  以温度、冷却方式、保护层厚度、钢筋直径等为研究参数，对高温后无缝钢管灌浆套筒进行单向拉伸试验。 结果  结果表明，灌浆料的抗折强度、抗压强度随着温度升高而降低，当温度达到800，1 000 ℃时，对抗折强度、抗压强度的影响更大，与常温相比，抗折强度分别下降了59%，81%，抗压强度分别下降了44%，72%，抗折强度下降幅度更大，说明温度对灌浆料抗折强度的影响大于抗压强度的；高温后试件有钢筋拉断和钢筋拔出两种破坏模式，浇水冷却和无保护层试件发生钢筋拔出破坏，临界温度相较于常温下降至800 ℃，浇水冷却和无保护层试件更容易出现钢筋拔出破坏，保护层可以有效提高灌浆套筒的延性和承载力；随着钢筋直径增加，接头试件极限承载力下降幅度变大，钢筋直径为18，20，22 mm的试件极限强度分别下降20.72%，24.24%，25.97%。推导了各参数影响下高温后灌浆套筒承载力计算公式，计算结果与试验结果吻合较好，该公式可对高温后全灌浆套筒的承载力进行预测。 结论  温度越高对灌浆料力学性能的影响越大；浇水冷却试件对高温更敏感，保护层能够有效提高灌浆套筒的耐高温性能。

关键词:装配式建筑;无缝钢管;灌浆套筒;单向拉伸

doi:10.16186/j.cnki.1673-9787.2023070001

基金项目:国家自然科学基金资助项目（12162010）；广西科技计划资助项目（AD20159085，AA20302006）

收稿日期:2023/07/01

修回日期:2023/09/08

出版日期:2024/07/15

Study on uniaxial tensile test of grouting sleeve of seamless steel pipe after high temperature

ZHAO Jun, WU Mingxun, YAO Dunmin, MA Bin

1.School of Architecture and Transportation Engineering，Guilin University of Electronic Technology，Guilin  541004，Guangxi，China;2.College of Civil Engineering and Architecture，Guilin University of Technology，Guilin  541004，Guangxi，China

Abstract:  Objectives  In order to understand the mechanical properties of the grouting sleeve of seamless steel tube after high temperature，  Methods  the uniaxial tensile test of the grouting sleeve of seamless steel tube after high temperature was carried out with temperature， cooling mode， thickness of protective layer， and diameter of steel bar as research parameters.  Results The flexural strength and compressive strength of the grouting material decrease with the increase of temperature. When the temperature reaches 800 °C and 1 000 °C， the influence on the flexural strength and compressive strength is greater. The flexural strength decreases by 59% and 81%， the compressive strength decreases by 44% and 72%， and the flexural strength decreases by more. It shows that the influence of temperature on the flexural strength of grouting material is greater than that on compressive strength. There are two failure modes of steel bar breaking and steel bar pulling out after high temperature. The critical temperature of steel bar pulling out failure of water- cooled and unprotected layer specimens is lower than that of normal temperature specimens at 800 °C. The water-cooled and unprotected layer specimens are more prone to steel bar pulling out failure. The protective layer can effectively improve the ductility and bearing capacity of the grouting sleeve. As the diameter of the steel bar increases， the ultimate bearing capacity of the joint specimens decreases. The ultimate strength of the specimens with steel bar diameters of 18， 20， and 22 mm decreases by 20.72%， 24.24%， and 25.97%， respectively. The calculation formula of bearing capacity of the grouting sleeve after high temperature is derived under the influence of various parameters. The calculation results are in good agreement with the experimental results. The formula can predict the bearing capacity of the full grouting sleeve after high temperature.  Conclusions The higher the temperature， the greater the influence on the mechanical properties of the grouting material. The water-cooled specimen is more sensitive to high temperature， and the protective layer can effectively improve the high-temperature resistance of the grouting sleeve.

Key words:fabricated building;seamless steel;pipe full grouting sleeve;monoaxial stretching