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为研究钢管混凝土短柱轴心受压承载力与钢管的作用,通过理论分析,建立了钢管约束承载力提高系数λ与套箍指标、钢管纵向应力和环向应力的关系。通过对124根轴心受压钢管混凝土短柱试验结果的分析,建立了λ与套箍指标和钢管屈服强度的关系式,提出了引入λ的钢管混凝土短柱轴心受压承载力计算公式。公式反映了钢管的直接承载作用和约束作用的大小,计算结果与试验结果符合良好。
In order to study the axial compressive bearing capacity of CFST short columns and the effect of the steel pipe, the relationship between the restraining capacity of the steel pipe restraining capacity λ and the index of the hoop, the longitudinal stress and the hoop stress of the steel pipe was established by theoretical analysis. Based on the analysis of the test results of 124 axial concrete filled steel tubular short columns, the relationship between λ and the index of cuff and the yield strength of the steel pipe is established. The formula for calculating the axial compressive bearing capacity of concrete filled steel tubular short columns with λ is proposed. The formula reflects the direct bearing and restraining effect of the steel pipe, and the calculated results are in good agreement with the experimental results.