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进行了11根圆形和正方形截面的空心钢管混凝土轴心受压长柱试验,研究了空心率、长细比和截面形式对空心钢管混凝土长柱承载力性能的影响,并对空心钢管混凝土轴压长柱的破坏形态进行了分析。分析结果表明,空心钢管混凝土长柱的破坏形态接近于空钢管长柱。同时在前人所做的轴压长柱试验数据基础上,进行了《薄壁离心钢管混凝土结构技术规程》(DL/T 5030-1996)与给出的空心钢管混凝土轴压长柱承载力计算公式的对比,表明给出的公式与试验结果吻合较好,说明使用该公式计算轴压长柱承载力是可行的。
The effects of hollow ratio, slenderness ratio and cross section on the bearing capacity of long hollow concrete filled steel tubular columns were investigated. Eleven hollow concrete filled steel tubular columns Analysis of the failure form of the pressure column was carried out. The analysis results show that the failure mode of hollow CFST long columns is close to the empty steel pipe long columns. Based on the experimental data of the axial compression long columns made by the predecessors, the bearing capacity of hollow concrete filled steel tubular columns with long thin columns subjected to the “Technical Specification for Thin-walled Centrifugal CFST Structure” (DL / T 5030-1996) The comparison of the formulas shows that the formulas given are in good agreement with the experimental ones, which shows that it is feasible to calculate the bearing capacity of long columns with axial compression using this formula.