河南理工大学学报（自然科学版）2024，Vol.43Issue(4)：186-196,11.DOI:10.16186/j.cnki.1673-9787.2023070001
高温后无缝钢管灌浆套筒单向拉伸试验研究
Study on uniaxial tensile test of grouting sleeve of seamless steel pipe after high temperature
摘要
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 ℃ and 1 000 ℃,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 wa-ter-cooled and unprotected layer specimens is lower than that of normal temperature specimens at 800 ℃.The water-cooled and unprotected layer specimens are more prone to steel bar pulling out failure.The pro-tective layer can effectively improve the ductility and bearing capacity of the grouting sleeve.As the diam-eter 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 tem-perature 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.关键词
装配式建筑/无缝钢管/灌浆套筒/单向拉伸Key words
fabricated building/seamless steel/pipe full grouting sleeve/monoaxial stretching分类
建筑与水利引用本文复制引用
赵军,吴明训,姚敦敏,马彬..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):186-196,11.基金项目
国家自然科学基金资助项目(12162010) （12162010）
广西科技计划资助项目(AD20159085,AA20302006) （AD20159085,AA20302006）
