中文摘要：

在4种无初应力的哑铃型钢管混凝土柱极限承载力计算方法的基础上，引入考虑初应力影响的折减系数，得到了考虑初应力影响的哑铃型钢管混凝土短柱轴压极限承载力的计算公式；通过合理地考虑中间主应力和材料拉压比对哑铃型钢管混凝土短柱轴压极限承载力的影响，提出了一种新的基于双剪统一强度理论的计算方法。将各种计算方法的计算值与试验值进行比较，验证了本文计算公式的合理性，并分析了各种方法的基本特点，可供工程应用参考。

英文摘要：

Based on four calculation methods of ultimate bearing capacity for dumbbell shaped concrete-filled steel tubular （CFST） columns without initial stress, and through importing initial stress reduction factor, the calculation formulas of the axial ultimate bearing capacity for dumbbell shaped CFST stub columns with initial stress were deduced with consideration of the influence of initial stress. According to the twin shear unified strength theory, which considered the influence of intermediate principal stress and the strength-differential of materials, a new calculation method was proposed. Through comparing the calculation results with the experiment data for various calculation methods, the rationality of the proposed formula was proved and the basic characteristics of each method were expatiated as well. The result is of great significance to practical engineering application.