内埋圆形钢管空间钢构架混凝土短柱轴压承载力计算

Calculation of axial bearing capacity of spatial steel frame concrete short columns embedded circular steel tube

为研究内埋圆形钢管空间钢构架混凝土短柱的轴压承载力,探索这种组合柱混凝土的约束机理,建立了轴压承载力与内埋钢管混凝土套箍指标ξ1和外部空间钢构架混凝土约束系数ξ2之间的关系.同时,考虑钢管对核心混凝土的侧向约束作用,以及空间钢构架对钢管外混凝土的侧向约束作用,建立了内埋圆形钢管空间钢构架混凝土短柱轴压承载力计算公式.试验结果表明,该文公式较好地反映了组合柱各部分的相互作用关系,可用于内埋圆形钢管空间钢构架混凝土短柱的轴压承载力计算.

In order to study the axial bearing capacity of spatial steel frame concrete short columns embedded circular steel tube,and explore the concrete constraint mechanism of the composite column,the relationship of the axial bearing capacity of the composite column with the confinement indexξ1 of the concrete-filled steel tube and the constraint coefficientξ2 of the outer spatial steel frame concrete is established.On the basis of mechanism analysis,the calculation formula of the axial bearing capacity of spatial steel frame concrete short columns embedded circular steel tube is established by considering the lateral restraint effect of steel tube on core concrete and the constraint effect of spatial steel frame on outside concrete of steel tube.The calculation results are in good agreement with the test results,and the calculation method can be used to calculate the axial bearing capacity of axial bearing capacity of spatial steel frame concrete short columns embedded circular steel tube.