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短柱轴压承载力是钢管混凝土最重要的力学指标之一,但目前对钢管高强混凝土力学性能的研究不够深入,强度指标不统一,各种计算方法差异较大,给工程应用带来困难。通过分析和对比11种国内外规程中计算钢管高强混凝土轴压承载力公式的差异,根据计算理论将其分为三类:套箍混凝土理论、统一理论、叠加计算理论。结合3个大尺寸轴压短柱试验研究结果,指出基于统一理论和叠加计算理论的结果较试验值低9%~31%,偏于保守;而《高强混凝土结构技术规程》(CECS 104∶99)的计算值与试验结果最为吻合且偏于安全,适用于工程实际;4种国外规程对钢管作用于混凝土的环箍效应考虑较少甚至不考虑,不能充分利用钢管混凝土的承载能力,在进行计算或设计时值得注意。
The axial compressive bearing capacity of CFST is one of the most important mechanical properties of CFST. However, the research on the mechanical properties of CFST is not deep enough, the strength indicators are not uniform, and the various calculation methods are quite different, which brings difficulties to engineering application. Through analyzing and contrasting the difference of bearing capacity formulas of 11 different types of high-strength concrete-filled steel tubes in China and abroad, it is divided into three categories according to calculation theory: hooping concrete theory, unified theory and superposition calculation theory. Based on the experimental results of three large axial compression studs, it is pointed out that the results based on the unified theory and the superposition calculation theory are 9% ~ 31% lower than the experimental values, which are conservative. However, the Technical Specification for High Strength Concrete Structures (CECS 104:99 ) Are in good agreement with the test results and are safe to be applied to engineering practice. The four kinds of foreign regulations have little or no consideration on the hoop effect of steel pipe on concrete, and can not make full use of the carrying capacity of CFST. Noteworthy when calculating or designing.