钢管混凝土粘结性能研究综述分析

Review analysis on study of bond behavior of concrete-filled steel tube

根据国内外关于钢管混凝土粘结滑移性能的理论和试验研究成果,介绍了钢管混凝土的粘结机理,对钢管混凝土粘结强度的研究现状、粘结强度的取值和影响粘结强度的主要因素进行了综合分析和比较。分析结果表明,混凝土强度、养护条件、收缩性能、试件长细比和抗剪键的设置等因素对钢管混凝土粘结强度的影响尚未达成统一认识,特别是工程中应用较多的抗剪键的设置机理还需做进一步的深入探讨;提出了一种新型的花纹钢管混凝土结构,此结构利用钢管内壁的凸起花纹来提高钢管与混凝土的自然粘结强度,具有安全、经济、施工方便的优点,值得推广和研究。

Based on the extensive literature reviews and experiment researches on the bond-slip behaviors of concrete-filled steel tube（ CFST） from home and abroad,the bond mechanism of CFST structures was introduced. The status quo of study on the bond strength of CFST structures was systematically analyzed and compared as well as determination of bond strength value and main factors influencing bond strength. The analysis results indicate that there has not yet formed a unified understanding on the impacts of influencing factors such as concrete strength,curing condition,shrinkage performance,slenderness ratio of specimens and the setting of shear connectors on bond strength of CFST,and it still needs to be further investigated especially for the setting mechanism of the shear connector in engineering. A new type of concrete-filled checkered steel tube structure was proposed to increase the nature bond strength of steel tube and concrete with the checkered pattern in inside wall of the steel tube. The concrete-filled checkered steel tube structure has the merits of safety,economical efficiency and convenient construction and is worthy of popularization and application.