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根据作者和国内外研究者有关钢管混凝土粘结性能的试验研究,对钢管混凝土粘结应力沿界面长度的分布规律进行了分析,从理论上推导出了钢管应力、钢管与混凝土的粘结应力和相对滑移之间的相互关系。通过数学分析得到了这三者的解析表达式。在理论研究的基础上,给出了随不同位置变化的钢管与混凝土粘结应力和相对滑移的本构关系,推导出了反应这种变化规律的位置函数,得到了与端部滑移及位置均有关的钢管与混凝土粘结应力的表达式。分析了含钢率对粘结应力的影响。该本构关系可为用有限元进一步分析钢管混凝土结构的非线性性能提供参考和依据。
According to the experimental research on the bond behavior of CFST by the author and researchers both at home and abroad, the distribution law of the bond stress along the length of the interface of the CFST is analyzed. The stress of the steel tube, the bond stress between the steel tube and the concrete, The relative slip between the correlation. Analytic expressions of these three are obtained through mathematical analysis. Based on the theoretical study, the constitutive relation between the bond stress and the relative slip of steel pipe and concrete with different positions is given, and the position function of the reaction law is deduced. Positions are related to the expression of steel pipe-concrete bond stress. The influence of steel content on the bond stress was analyzed. The constitutive relation can provide reference and basis for the further analysis of the nonlinear behavior of CFST with finite element method.