钢管混凝土轴压短柱界限套箍系数

基于统一强度理论，借助钢管混凝土轴压短柱极限承载力计算公式的推导，得出了极限状态时钢管和混凝土之间的侧压力，提出了界限套箍系数的概念，并给出界限套箍系数的计算公式，同时分析了不同套箍系数时钢管的三向应力和钢管混凝土短柱的轴压应力-应变曲线出现不同发展趋势的原因，且理论分析得出的结论与相关文献的试验结果一致，说明分析过程的合理性；最后对影响因素进行了分析，根据分析结果提出了实用建议，并发现相关参考文献的界限套箍系数为该研究结果的特例。

Boundary Casing Hoop Coefficient for Concrete-filled Steel Tubular Stub Columns Under Axial Compression

Based on unified strength theory ,a ultimate bearing capacity calculation formula for concrete-filled steel tubular stub columns under axial compression was proposed . The lateral pressure between the steel tube and concrete was given in the ultimate state .The concept of limit casing hoop coefficient was presented ,and the calculation formulae of limit casing hoop coefficient were given .Meanwhile ,the limit value of casing hoop coefficient was defined to analyze the reasons for different development trends with different casing hoop coefficients appeared in axial compression stress-strain curve , and the theoretical analysis results were similar to the experiment results in relevant literature ,and the rationality of analysis process was pointed out . Finally ,parametric studies were carried out to analyze the influencing factors ,and the practical suggestions were put forward due to the analysis results .It was also found that the limit casing hoop coefficient of relevant references was a special case for this study .