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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。
Taking the side pressure as the basic parameter, the ultimate bearing capacity of concrete filled square steel tube short columns filled with spiral stirrup was taken as the axial compressive ultimate bearing capacity of square concrete-filled square steel tube short columns and the spiral stirrups provided independently by the concrete for effective restraint zone Of the bearing capacity of the two parts of the superposition, the use of uniform strength yield criterion to calculate the longitudinal bearing capacity of steel and the side of the lateral pressure, taking into account the intermediate principal stress and yield strength ratio of tensile strength of the material, when the tensile strength of the steel yield ratio 1, with the different value of parameter b, the predicted range of axial compressive ultimate bearing capacity of concrete filled square steel tube with spiral stirrup can be obtained. Comparing the existing tests, the finite element simulation results and the formula calculation results, we can see that the formulas deduced in this paper can predict the ultimate bearing capacity of concrete filled square steel tube columns with spiral stirrup more accurately and can be applied to practical engineering design.