钢管混凝土轴压短柱界限套箍系数

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发布时间：2021-12-03

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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一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。
关键词：钢管混凝土；统一强度理论；轴压；套箍系数；应力一应变曲线
中图分类号：TU398．9 文献标志码：A
Boundary Casing H oop Coefficient for Concrete—filled Steel Tubular
Stub Colum ns Under Axial Com pression
W U Peng，ZHA0 Jun—hai，ZHANG Chang—guang，ZHU Qian，LI Yan
(School of Civil Engineering，Chang’an University，Xi’an 710061，Shaanxi，China)
Abstract：Based on unified strength theory，a ultimate bearing capacity calculation form ula for
concrete—filled steel tubular stub colum ns under axial compression was proposed． The lateral
pressure between the steel tube and concrete was given in the ultimate state．The concept of 1imit
casing hoop coefficient was presented，and the calculation form ulae of lim it casing hoop coefficient
were given． M eanwhile， the lim it 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 sim ilar to the
experim ent results in relevant literature，and the rationality of analysis process was pointed out．
Finally，param etric 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．
Key words：concrete—filled steel tube；unified strength theory；axial compression；casing hoop CO—
efficient；stress—strain curve
引
钢管混凝土是钢管内填充混凝土形成的构件，
它具有承载力大、塑性和韧性好、施工方便等特
点，已被广泛应用于工程实际。目前，确定钢管
混凝土轴压短柱极限承载力时所遵循的基本概念