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中文摘要：
以侧压力为基本参数,将内配螺旋箍筋方钢管混凝土短柱的轴压极限承载力视为方钢管混凝土短柱的轴压极限承载力与螺旋箍筋独立为内部有效约束区混凝土所提供的附加承载力两部分的叠加,采用统一强度屈服准则计算方钢管纵向承载力及其受到的侧压力,考虑了中间主应力和材料拉压屈服强度比的影响,当钢材拉压屈服强度比为1时,随着参数b取值的不同,可以获得内配螺旋箍筋方钢管混凝土短柱轴压极限承载力的预测范围。通过对比已有试验、有限元模拟结果及公式计算结果可知,本文推导的公式能够较准确地预测内配螺旋箍筋方钢管混凝土短柱的轴压极限承载力,可以应用到实际工程设计中。
英文摘要：
The ultimate axial bearing capacity of square CFST short column with the spiral stirrup inside was regarded as the superposition of the ultimate axial bearing capacity of the square CFST short column and the additional bearing capacity that the spiral stirrup column singly provides for the internal effective confined concrete. Besides,the lateral pressure was introduced as the basic parameter in calculating longitudinal bearing capacity and the lateral pressure of square CFST based on the unified strength yield criterion considering the impacts of the intermediate main stress and the tension-compression yield strength ratio of the material. When the tension-compression yield strength ratio of the steel equals to 1,the prediction range of the ultimate axial bearing capacity of square CFST short column with the spiral stirrup inside can be derived with changes of values of parameter b. Through comparing the existing experimental data and FEM simulation results and formula calculation results,it can be concluded that deduced formula can accurately predict the ultimate axial bearing capacity of square CFST short column with the spiral stirrup inside and the formula can be applied to practical engineering design.
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